owner`s manual
Contents
1. m E 80 0 250 Off HP LP 12dB 24dB 60 Filter Filter 50 Mode Slope Filter Freq Hz Status 500 JL AUDIO HD7E T Chassis Ground Left amp Right Connector Input Jacks pgs 6 7 pg 9 Jackfor 12V Power Remote Turn On Left amp Right Preamp Remote Level Connector Connector Output Jacks 4 Control Knob pgs 6 7 pgs 6 7 pg 12 pg 13 lel 12VDC Ground Remote L Inputs Preouts Remote Level Control R R P 2 JL Audio HD750 1 Owner s Manual Cooling Efficiency Considerations Your JL Audio amplifier employs an advanced type of heat management called RealSink This feature takes advantage of convection and radiation effects to remove heat from the amplifier circuitry For optimum cooling performance the vertical heat sinks located at the sides of the amplifier should be exposed to as large a volume of air as possible Enclosing the amplifier in a small poorly ventilated chamber can lead to excessive heat build up and degraded performance If an installation calls for an enclosure around the amplifier we recommend that this enclosure be ventilated with the aid of a fan In normal applications fan cooling is not necessary If mounting the amplifier under a seat make sure there is at least 1 inch 2 5 cm of space above the amplifier s outer shell to permit prope2. My amplifier s output fluctuates when tap on it or hit a bump Check the connections to the amplifier Make sure that the insulation for all wires has been stripped back far enough to allow a good contact area inside the connector plugs Check the input connectors to ensure that they all are making good contact with the input jacks on the amplifier 20 JL Audio HD750 1 Owner s Manual My amplifier shuts off once in a while usually at higher volumes Check your voltage source and grounding point The power supply of the HD750 1 will operate with charging system voltages down to 8 5V Shutdown problems at higher volume levels can occur when the charging system voltage drops below 8 5V These dips can be of very short duration making them extremely difficult to detect with a common DC voltmeter To ensure proper voltage inspect all wiring and termination points It may also be necessary to upgrade the ground wire connecting the battery to the vehicle s chassis and the power wire connecting the alternator to the battery Many vehicles employ small 10 AWG 6 AWG wire to ground the battery to the vehicle s chassis and to connect the alternator to the battery To prevent voltage drops these wires should be upgraded to 4 AWG when installing amplifier systems with main fuse ratings above 60A Grounding problems are the leading cause of misdiagnosed amplifier failures My amplifier turns on but there is no output
3. Check the input signal using an AC voltmeter to measure the voltage from the source unit while an appropriate test tone is played through the source unit disconnect the input cables from the amplifier prior to this test The frequency used should be in the range that is to be amplified by the amplifier example 50 Hz for a sub bass application or 1 kHz for a full range high pass application A steady sufficient voltage between 200mV and 8 0 volts should be present at the output of the signal cables Check the output of the amplifier Using the procedure explained in the previous check item after plugging the input cables back into the amplifier test for output at the speaker outputs of the amplifier Unless you enjoy test tones at high levels it is a good idea to remove the Speaker Connector Plugs from the amplifier while doing this Turn the volume up approximately half way 5V or more should be measured at the speaker outputs This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume If you are reading sufficient voltage check your speaker connections as explained below Check to ensure that the speaker wires are making a good connection with the metal inside the Speaker Connector Plugs The speaker wire connectors are designed to accept up to 12 AWG wire Make sure to strip the wire to allow for a sufficient connection with the metal inside each termin
4. 2250 20 per ch 50 Hz Crossover Filter Filter Type State variable 12 dB octave Butterworth or 24 dB octave Linkwitz Riley Filter Modes Low Pass or High Pass Defeatable Cutoff Freq Range Continuously variable 50 500 Hz Input Sections No of Inputs One Stereo Pair sums to mono Input Type Differential balanced with RCA jack inputs Input Range Switchable from 200mv 2V RMS Low to 800mv 8V RMS High Preamp Output 2 Channel buffered pass through type Chassis Dimensions LxWxH 10 74 in x 7 85 in x 1 93 in 273 mm x 199 5 mm x 49 mm Dimensions do not include connectors Due to ongoing product development all specifications are subject to change without notice APPENDIX B Precise Frequency Selection Chart FILTER FREQ Detent Panel Actual Number Marking Freq Full counter clockwise 53 Ol pamm 507 sessi 53 LU ME IAIA E EDAN 53 OE EN EET ade 53 Dd EERE E ted 53 UTERE 54 I fe be doa tede waa P REFYRQS ERES 56 TIL eden AER EFEIREXMMISERATIS 58 Das suede 607 cheno 23 ail 60 OD au i CLER anas du Rd 62 HD NM S 64 pereo cU ed 66 re 68 ine atin nae datd Pee PERRA 7i CNN EUROS PEN 74 E vi rk at ete nce es an 76 B sow BOM iss sais 80 p A POG CARINE 83 wieso tnt ahs fie wa Sea 87 Oi RASA MR ek bead 91 Dios cheek OE SENE 94 2d scusa aS esas 99 DD overeat eyelet Spy meme 23 04 p TERT 09 2A ereetus 12 oclock 15 y NN 21 PO eria eder E TAA 28 DT ys ea NOE ERE
5. and is available for sale at http www jlaudio com Do not use attenuated test tones 10 dB 20 dB etc ia IMPORTANT Do not increase any Input Sens setting in the system beyond the maximum level established during this procedure Doing so will result in audible distortion and possible speaker damage It will be necessary to re adjust the Input Sens for the affected channels if any equalizer boost is activated after setting the Input Sens with this procedure This applies to any EQ boost circuit source unit tone controls or EQ circuits EQ cuts will not require re adjustment 18 JL Audio HD750 1 Owner s Manual The Nine Step Procedure 1 Disconnect the Speaker Connector Plug 2 Turn off all processing on the source unit bass treble loudness EQ etc Set fader control to center position and subwoofer level control to 3 4 of maximum if used to drive the HD750 1 Disconnect the HD RLC Remote Level Control temporarily if one is being used 3 Switch the Input Voltage to Low and turn the Input Sens control all the way down 4 Set the source unit volume to 3 4 of full volume If the amplifier is being driven by a source unit s dedicated subwoofer output also adjust the source unit s subwoofer level control to 3 4 of maximum output This will allow for reasonable gain overlap with moderate clipping at full volume 5 Using the chart below determine the target vol
6. be required to produce a smooth transition between the sound of different speakers in the system In high pass mode the sharper 24dB setting will do a better job of protecting small speakers with limited power handling In low pass mode the 24dB setting can also help by more aggressively removing lower midrange output from a subwoofer system The shallower 12dB octave setting allows for more output overlap between the speakers being crossed over In many cases this will result in a smoother blend or transition between speaker systems Experiment to find the slope or combination of slopes which best matches the acoustic requirements of your system 3 Filter Freq Hz Control This control selects the frequency at which the filter begins to attenuate the signal and refers specifically to the frequency at which output has been attenuated by 3dB The filter frequency markings surrounding this rotary control are for reference purposes and are generally accurate to within 1 3 octave or better If you would like to select the filter cutoff frequency with a higher level of precision consult the charts in Appendix B page 18 of this manual INFRASONIC FILTER The Infrasonic Filter is a 24 dB octave high pass filter with a fixed cutoff frequency of 30 Hz This filter is designed to conserve amplifier power and protect subwoofer systems without audibly degrading the sub bass output LI
7. determination If you change crossover slopes or crossover filter frequencies you may need to revisit this control as these can affect the phase of the speaker systems in the overlap region PREAMP OUTPUTS The HD750 1 incorporates a pass through preamp output section so that additional amplifiers can easily be connected to the same signal s feeding the HD750 1 These preamp output signals are accessible via a stereo pair of RCA type jacks labeled Preouts on the Connection Panel e fi Preouts e The term pass through refers to the fact that the Preamp Output signals are not affected by any crossover filter or input sensitivity setting selected on the HD750 1 if the input signal is full range the Preamp Output will be full range These preamp output signals are buffered to prevent noise and are always preamp level regardless of the level of signals feeding the HD750 1 s inputs 12 JL Audio HD750 1 Owner s Manual REMOTE LEVEL CONTROL OPTIONAL With the addition of the optional Remote Level Control HD RLC you can control the volume of the HD750 1 from the front of the vehicle This is particularly useful for subwoofer level control The HD RLC connects to the jack labeled Remote Level Control on the Connection Panel of the amplifier using a standard telephone cable supplied with the HD RLC If desired multiple HD amplifiers can be controlled from a single HD RLC controller using a simp
8. mi 80 deg Off 30Hz utput Infrasonic larity Filter With ported enclosures the use of the Infrasonic Filter is highly recommended to protect the speaker s from excessive excursion below box tuning With sealed enclosures the use of the filter is less necessary but can still help protect the speaker system from excessive excursion The Infrasonic Filter can be completely defeated by selecting the Off position on its switch This bypasses all signal from flowing through the circuit OUTPUT POLARITY CONTROL Depending on the distance relationship of the mid bass speakers and the subwoofers in a system it can be desirable to reverse the polarity of the subwoofer system in order to produce a better transition between subwoofer and midbass speaker output This is normally done by swapping the positive and negative wires connected to the subwoofer s m m High 0 180 deg Off 3C out Output Infraso tage Polarity Filte Amplifier The Output Polarity switch on the HD 750 1 allows you to quickly peform this polarity inversion without touching any wires Simply flip the switch from the 0 normal to the 180 deg reversed position Neither switch position is correct for every system Experiment to determine which polarity produces the best overall bass performance in your system listening in particular to the mid bass smoothness and impact to make your
9. or consequential damages and does not cover the cost of removing or reinstalling the unit s Cosmetic damage due to accident or normal wear and tear is not covered under warranty Warranty is void if the product s serial number has been removed or defaced Any applicable implied warranties are limited in duration to the period of the express warranty as provided herein beginning with the date of the original purchase at retail and no warranties whether express or implied shall apply to this product thereafter Some states do not allow limitations on implied warranties therefore these exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state If you need service on your JL AUDIO product All warranty returns should be sent to JL AUDIO s Amplifier Service Facility freight prepaid through an authorized JL AUDIO dealer and must be accompanied by proof of purchase a copy of the original sales receipt Direct returns from consumers or non authorized dealers will be refused unless specifically authorized by JL AUDIO with a valid return authorization number Warranty expiration on products returned without proof of purchase will be determined from the manufacturing date code Coverage may be invalidated as this date is previous to purchase date Non defective items received will be returned freight collect Customer is responsible for shipping charges and insura
10. output The two positive and two negative connections are connected in parallel inside the amplifier Connecting two speakers each to one set of positive and negative terminals will result in a parallel speaker connection If only connecting one pair of speaker wires it is not necessary to use both sets of connections Ey IMPORTANT Do not chassis ground any speakers connected to this or any other JL Audio amplifier Doing so will cause the amplifier to go into protection and mute the output STATUS LED PROTECTION CIRCUITRY There is a single multi color LED on the control panel of the amplifier to indicate the amplifier s operating status This LED s behavior is as follows 1 Flashing Green amplifier is powering up audio output is muted 2 Constant Green amplifier is on and functioning normally audio output is active 3 Constant Red lights to indicate that the amplifier has exceeded its safe operating temperature putting the amplifier into a self protection mode which reduces the peak power output of the amplifier The red light will turn green and the amplifier will return to full power operating mode when its temperature returns to a safe level 3 Constant Amber yellow lights to indicate that the impedance of the speaker load connected to the amplifier is lower than its optimum load impedance range When this light is on a protection circuit engages and reduces the power output of the amplifie
11. testing If no problem is found with the fuse inspect the fuse holder Check the integrity of the connections made to each of the 12VDC Ground and Remote terminals Ensure that no wire insulation is pinched by the terminal set screw and that each connection is tight Check to make sure there is 12V at the Remote connection of the amplifier In some cases the turn on lead from the source unit is insufficient to turn on multiple devices and the use of a relay is required To test for this problem jump the 12VDC wire to the Remote terminal to see if the amplifier turns on get a distorted attenuated sound coming out of the speaker s Check the speaker wires for a possible short either between the positive and negative leads or between a speaker lead and the vehicle s chassis ground If a short is present you will experience distorted and or attenuated output The Status LED will turn amber yellow in this situation It may be helpful to disconnect the speaker wires from the amplifier and use a different set of wires connected to a test speaker Check the nominal load impedance to verify that the amplifier is driving a load equal to or greater than 1 5 ohms Check the input signal and input signal cables to make sure signal is present at the Amplifier Inputs and the cables are not pinched or loose It may be helpful to try a different set of cables and or a different signal source to be sure
12. OWNER S MANUAL H 750 1 Monoblock Wide Range Amplifier Thank you for purchasing a JL Audio amplifier for your automotive sound system Your amplifier has been designed and manufactured to exacting standards in order to ensure years of musical enjoyment in your vehicle For maximum performance we highly recommend that you have your new amplifier installed by an authorized JL Audio dealer Your authorized dealer has the training expertise and installation equipment to ensure optimum performance from this product Should you decide to install the amplifier yourself please take the time to read this manual thoroughly so as to familiarize yourself with its installation requirements and setup procedures If you have any questions regarding the instructions in this manual or any aspect of your amplifier s operation please contact your authorized JL Audio dealer for assistance If you need further assistance please call the JL Audio Technical Support Department at 954 443 1100 during business hours PROTECT YOUR HEARING We value you as a long term customer For that reason we urge you to practice restraint in the operation of this product so as not to damage your hearing and that of others in your vehicle Studies have shown that continuous exposure to high sound pressure levels can lead to permanent irreparable hearing loss This and all other high power amplifiers are capable of producing such high sound pressure leve
13. RES 37 E MCN MP TEPUTEYTE 47 EE 60 SD IE a RR ARERN SS 74 3 2oteest ask xu ESSET 91 KY apd Nia rue Utara eg fa 211 nner PTET 236 34 OEE EEEE 269 Rope PT 309 L pr EEE EEE 369 Sr peer EN 443 SD ocn 500 484 ag dud cibi viii e ERES 2s 525 Full clockwise 528 APPENDIX C Input Sensitivity Level Setting JL Audio amplifiers utilizing the Regulated Intelligent Power Supply R LP S allow delivery of their rated power when connected to any load impedance from 1 5 40 per channel and when connected to a charging system with any voltage from 11 14 5V This design is beneficial for many reasons One of these reasons is ease of setup Because each JL Audio amplifier will always deliver the same amount of power within its operational range of impedances and supply voltages the maximum unclipped output is very predictable This makes setting the gain structure via the input sensitivity controls very simple Following the directions below will allow the user to adjust the input sensitivity of the amplifier s simply and easily in just a few minutes using equipment which is commonly available in installation bays Necessary Equipment e Digital AC Voltmeter CD with a sine wave test tone recorded at 0 dB reference level in the frequency range to be amplified for that set of channels 50 Hz for subwoofer channels 1 kHz for a midrange application The CleanSweep Calibration Disc contains the appropriate test tones
14. To connect the power wires and the remote turn on wire to the amplifier unplug the power connector plug from the amplifier chassis pull back firmly and back out the set screws on the connector plug using the supplied 4 mm hex wrench for the 12 VDC and Ground connections and the supplied 2 5 mm hex wrench for the Remote connection Strip 3 8 inch 10 mm of insulation from the end of each wire and insert the bare wire into the receptacle on power connector plug seating it firmly so that no bare wire is exposed While holding each wire in place tighten each set screw firmly taking care not to strip the head of the screw B IMPORTANT Never make power connections with a live wire Always disconnect the negative battery post before making any connections or adjustments to a 12V power connection AMPLIFIER MOUNTING OPTIONS The HD750 1 has two mounting options to ease in installation Standard Mounting The standard method of mounting requires removal of the four corner caps with the 3 16 inch hex wrench included with your amplifier Using appropriate mounting screws not included secure the amplifier in all four corners and replace the corner caps Lateral Mounting Feet CONTROL PANEL SECURITY COVER The HD750 1 features a Control Panel Security Cover When installed the cover ensures that your amplifier settings are not accidentally changed while creating a clean aesthe
15. UENCE The following represents the sequence for a typical amplifier installation using an aftermarket source unit or OEM Interface processor like the CleanSweep CL441dsp Additional steps and different procedures may be required in some applications If you have any questions please contact your authorized JL Audio dealer for assistance 1 Disconnect the negative battery post connection and secure the disconnected cable to prevent accidental re connection during installation This step is not optional 2 Run power wire from the battery location to the amplifier mounting location taking care to route it in such a way that it will not be damaged and will not interfere with vehicle operation 4 AWG is recommended for wire runs greater than 72 inches 180 cm in length Use of 8 AWG power wire is acceptable for shorter runs such as from a power distribution block to the amplifier or from a trunk mounted battery Use a2 AWG or 1 0 AWG main power wire with a power distribution block when additional amplifiers are being installed with the HD750 1 and powered from the same main power wire 3 Connect power wire to the positive battery post Fuse the wire with an appropriate fuse block and connectors within 18 inches 45 cm wire length of the positive battery post This fuse is essential to protect the vehicle Do not install the fuse until the power wire has been connected to the amplifier 4 Run signal cables RCA cables and remo
16. al 21 INSTALLATION NOTES Use this diagram to document your amplifier s switch and control positions O O Status i3 Off HP LP Filter Mode 80 250 500 C 12dB 24dB 60 50 Filter Inr Slope Filter Freq Hz Se JL AUDIO HD750 1 22 JL Audio HD750 1 Owner s Manual X dE ea ca Low High 0 180 deg Off 30Hz ut Input Output Infrasonic ns Voltage Polarity Filter Monoblock Amplifier LIMITED WARRANTY AMPLIFIERS USA JL AUDIO warrants this product to be free of defects in materials and workmanship for a period of two 2 years The warranty is extended to three 3 years total if installation is performed by an authorized JL Audio dealer using a JL Audio Premium Power Connection System for power wiring This warranty is not transferable and applies only to the original purchaser from an authorized JL AUDIO dealer Should service be necessary under this warranty for any reason due to manufacturing defect or malfunction JL AUDIO will at its discretion repair or replace the defective product with new or remanufactured product at no charge Damage caused by the following is not covered under warranty accident misuse abuse product modification or neglect failure to follow installation instructions unauthorized repair attempts misrepresentations by the seller This warranty does not cover incidental
17. an 72 inches 8 AWG pure copper power wire is acceptable If you are installing the HD750 1 with other amplifiers and wish to use a single main power wire use 2 AWG or 1 0 AWG pure copper wire as a main power wire This 2 AWG or 1 0 AWG power wire should terminate into a distribution block mounted as close to the amplifiers as possible and should connect to the HD750 1 with 4 AWG or 8 AWG pure copper power wire Please note that lower AWG numbers mean bigger wire and vice versa 1 0 AWG is the largest 2 AWG is smaller then 4 AWG then 8 AWG etc B IMPORTANT We do not recommend the use of copper clad aluminum wire or CCA wire because this wire is significantly less conductive than pure copper wire Only use pure copper power wire such as JL Audio Premium Power Wire Tinned copper wire silver color is acceptable as the tin plating is only a very minor component of the wire Fuse Requirements The installation of a fuse on the main power wire within 18 wire inches 45 cm of the positive battery terminal is vital to protect the wire and the vehicle from fire in the event of a collision or short circuit The fuse value at each power wire should be just high enough for all of the equipment being run from that power wire Do not use a fuse with a value that far exceeds the total fuse rating of the electronics connected to the wire If only the HD750 1 is being run from that power wire we recommend a 60A fuse be use
18. cks on the Connection Panel of the amplifier and a pair of input controls on the Control Panel of the amplifier an Input Voltage switch and an Input Sens rotary control Inputs 4 The HD750 1 features stereo inputs even though it is a mono amplifier This has been done to permit the amplifier to sum stereo input signals to mono which is particularly useful for driving subwoofers Even if you have a dedicated mono subwoofer signal available or are feeding a left channel only or a right channel only into the amplifier you must feed both inputs of the HD750 1 Connection of only one RCA input will result in reduced power output increased distortion and can cause the amplifier to overheat To connect a mono signal to both inputs use an RCA Y Adaptor sold separately INPUT CONTROLS On the amplifier s control panel you will find an Input Voltage range switch and a rotary control labeled Input Sens Input Sensitivity These controls are designed to match the input sensitivity of the HD750 1 to the specific signal source that is feeding it and must be adjusted with care following the procedures outlined in this manual Failure to make correct adjustments can result in weak output excessive distortion and or undesirable noise in the audio output of the amplifier D m m Low High 0 18 ut Input Ou ns Voltage Pol Monoblock Amplifier Input Voltage Switch A wi
19. d AGU big glass fuse AFS small blade fuse or MaxiFuse big plastic body fuse types are recommended If other amplifiers are also being powered from a main power wire and exceed 80 amps in total fuse rating we recommend the use of an ANL large blade fuse and holder Each amplifier must be fused independently at the outputs of the power distribution block Use JL Audio part XC FOA 2PAK and appropriate MaxiFuse type fuses with JL Audio distribution blocks Please consult with your JL Audio dealer to make sure that the wire fuse holder and fuse ratings are appropriate for your system s needs The safety of your installation depends on appropriate power connections and fuse protection 6 JL Audio HD750 1 Owner s Manual Ground Connection The chassis ground connection must be made using 4 AWG or 8 AWG pure copper wire and should be kept as short as possible while accessing a solid piece of sheet metal in the vehicle The surface of the sheet metal should be sanded at the contact point to create a clean metal to metal connection between the chassis and the termination of the ground wire with a brass or copper power ring For optimal grounding we recommend the use of a JL Audio ECS master ground lug XB MGLU Alternatively a sheet metal screw or bolt can be used with a star washer Ea IMPORTANT Many vehicles employ small 10 AWG 6 AWG wire to ground the battery to the vehicle chassis and to connect the alt
20. de range of signal input voltages can be accommodated by the HD750 1 s differential balanced inputs 200mV 8V RMS This wide range is split up into two sub ranges accessible via the Input Voltage switch The Low position on the Input Voltage switch selects an input sensitivity range between 200mV and 2V This means that the Input Sens rotary control will operate within that voltage window If you are using an aftermarket source unit with preamp level outputs this is most likely the position that you will use regardless of what voltage output capability is claimed by the source unit The High position on the Input Voltage switch selects an input sensitivity range between 800mV and 8V This is for use with speaker level outputs from source units and small amplifiers found in many OEM factory installed systems To use speaker level sources splice the speaker output wires of the source unit or small amplifier onto a pair of RCA plugs for each input pair or use the JL Audio ECS Speaker Wire to RCA adaptor XB CLRAIC2 SW Ea IMPORTANT The output of the amplifier decreases for a given input voltage when the Input Range switch is placed in the High position The output increases with the switch in the Low position While this may sound counter intuitive it is correct as described Input Sens Control Located to the left of the Input Voltage switch is a rota
21. er Outputs pgs 13 14 PRODUCT DESCRIPTION The JL Audio HD750 1 is a very powerful and compact monoblock single channel wide range amplifier utilizing patented Single Cycle Control Class D technology This groundbreaking technology delivers referencegrade sonic performance while requiring far less current from the vehicle s electrical system than a conventional amplifier Unlike most monoblock amplifiers the HD750 1 is a wide range design so it can be used as a subwoofer amplifier or as a very powerful mid bass or mid range amplifier using a second HD750 1 to form a stereo pair Its effective frequency response is from 6 Hz very low bass to 8 KHz lower treble range JL Audio s exclusive R LP S power supply design optimizes the output the amplifier for any impedance between 1 5 and 4 ohms allowing you to get full use of the HD750 1 s performance capabilities with a wide range of speaker systems The tightly regulated power supply design also means that the HD750 1 s clean power output capability remains stable over a wide range of vehicle voltages resulting in enhanced fidelity A flexible input and crossover section permits operation with a wide variety of source units and system configurations The HD750 1 s preamp output can send pass through signals from the inputs to feed additional amplifier s 4 JL Audio HD750 1 Owner s Manual TYPICAL INSTALLATION SEQ
22. ernator s positive connection to the battery To prevent voltage drops these wires should be upgraded to 4 AWG pure copper wire when installing amplifier systems with main fuse ratings above 60A Turn On Wire The HD750 1 uses a conventional 12V remote turn on wire typically controlled by the source unit s remote turn on output The amplifier will turn on when 12V is present at its Remote input and turn off when 12V is switched off If a source unit does not have a dedicated remote turn on output the amplifier s turn on lead can be connected to 12V via a switch that derives power from an ignition switched circuit The HD750 1 s Remote turn on connector is designed to accept 18 AWG 12 AWG wire 18 AWG is more than adequate for this purpose To connect the remote turn on wire to the amplifier first back out the set screw on the bottom of the Power Connector Plug using the supplied 2 5 mm hex wrench Strip 1 2 inch 12mm of wire and insert the bare wire into the receptacle seating it firmly so that no bare wire is exposed When using smaller wire it may be necessary to strip 1 inch of insulation from the wire and fold the bare wire in half prior to insertion While holding the wire in the terminal tighten the set screw firmly using the supplied 2 5 mm hex wrench taking care not to strip the head of the screw and making sure that the wire is firmly gripped by the set screw Amplifier Power Connector Plug
23. figure The system operates through multiple stages of impedance optimization choosing the stage most appropriate to the actual impedance of the speakers you connect to it Ey IMPORTANT If you connect a load higher than 40 nominal power will drop by half with every doubling of impedance above 40 stereo If you connect a load lower than 1 50 nominal the amplifier protection circuitry activates a safe mode which reduces amplifier power to protect the circuitry from failure the LED status indicator on the control panel will light up amber to indicate that this has happened See page 14 for details S IMPORTANT Speaker loads below 1 50 nominal are not recommended and may cause the amplifier output to distort excessively Speaker Connector Plugs To connect the speaker wires to the amplifier unplug the speaker connector plug from the amplifier chassis pull back firmly and back out the set screws on the connector plug using the supplied 2 0 mm hex wrench Strip 3 8 inch 10 mm of insulation from the end of each wire and insert the bare wire into the receptacle on the speaker connector plug seating it firmly so that no bare wire is exposed While holding each wire in place tighten each set screw firmly taking care not to strip the head of the screw You will notice that there are two sets of and connections on the plug This is to facilitate multiple speaker wiring to the HD750 1 s mono
24. le phone line splitter and multiple phone cables not supplied L Preouts Remote Level Control R When connected to the amplifier the HD RLC operates as follows At full counter clockwise rotation the audio will mute completely At full clockwise rotation the level will be the same as if the HD RLC was not connected at all In other words it operates strictly as a level attenuator E IMPORTANT The RBC 1 Remote Bass Control used with JL Audio Slash Slash v2 e Series A Series and G Series amplifiers is NOT compatible with the HD Series amplifiers If you attempt to connect an RBC 1 to an HD amplifer the control will not work You must use the HD RLC controller SPEAKER CONNECTIONS The HD750 1 employs JL Audio s exclusive Regulated Intelligent Power Supply R LP S design This sophisticated power supply allows the amplifier to produce its optimum power 750 watts x 1 over a wide range of supply voltage and speaker impedances Unlike conventional amplifiers that require a specific impedance to produce optimum power the R I P S equipped HD750 1 gives you the freedom to use a variety of speaker configurations that achieve final nominal impedances between 1 5 4Q without sacrificing power output or sound quality The operation of the R I P S circuitry is entirely automatic and adjusts itself every time the amplifier is turned on There are no user controls to con
25. ls when connected to a speaker system Please limit your continuous exposure to high volume levels While driving operate your audio system in a manner that still allows you to hear necessary noises to operate your vehicle safely horns sirens etc SERIAL NUMBER In the event that your amplifier requires service or is ever stolen you will need to have a record of the product s serial number Please take the time to enter that number in the space provided below The serial number can be found on the bottom panel of the amplifier and on the amplifier packaging Serial Number INSTALLATION APPLICATIONS This amplifier is designed for operation in vehicles with 12V negative ground electrical systems Use of this product in vehicles with positive ground and or voltages other than 12V may result in damage to the product and will void the warranty This product is not certified or approved for use in aircraft Do not attempt to bridge the outputs of this amplifier with the outputs of a second amplifier including an identical one PLANNING YOUR INSTALLATION It is important that you take the time to read this manual and that you plan out your installation carefully The following are some considerations that you must take into account when planning your installation Power Status Filter Slope Indicator Selection pgs 14 15 pg 11 Filter Mode Filter Frequency Selection Selector pg 10 pg 11
26. nce in sending the product to JL AUDIO Freight damage on returns is not covered under warranty For Service Information in the U S A please call JL Audio Customer Service 954 443 1100 9 00 AM 5 30 PM Eastern Time Zone JL Audio Inc 10369 North Commerce Pkwy Miramar FL 33025 do not send product for repair to this address International Warranties Products purchased outside the United States of America are covered only by that country s distributor and not by JL Audio Inc Single Cycle Control U S Patent 6 084 450 is used under exclusive license for mobile audio from Power Physics Inc Newport Beach CA Printed in China HD750 1MAN CH 031213
27. r The amber indicator will also light when a short circuit is detected in the speaker wiring this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis 14 JL Audio HD750 1 Owner s Manual 4 Alternating Red and Green lights to indicate that the amplifier is experiencing a fault that may require service of the amplifier its wiring or the vehicle s charging system Audio is muted when this fault occurs The most likely cause of this fault is a low supply voltage condition If battery voltage drops below 8 5 volts at any point the amplifier except for the Status LED will shut itself off to protect itself and the vehicle s charging system If the voltage drops below 6 volts the Status LED will also turn off The amplifier will turn back on automatically when voltage climbs back above 9 volts This shut down and turn on behavior may happen in a rapid cycle when bass heavy program material causes a weak charging system to momentarily dip too low If this is happening in your system have your charging system inspected to make sure it is working properly If no problem is found with the supply voltage to the amplifier and you are still seeing alternating Red and Green on the Status LED it is likely that the amplifier is suffering from an internal fault that requires factory service For more information on troubleshooting this amplifier
28. r cooling Input Sensitivity Output Polarity Control Selection pg 10 pg 12 Infrasonic Filter Input Voltage Selector Selection pg 11 pg 9 Safety Considerations Your amplifier needs to be installed in a dry well ventilated environment and in a manner which does not interfere with your vehicle s safety equipment air bags seat belt systems ABS brake systems etc You should also take the time to securely mount the amplifier using appropriate hardware so that it does not come loose in the event of a collision or a sudden jolt to the vehicle Stupid Mistakes to Avoid Check before drilling any holes in your vehicle to make sure that you will not be drilling through a gas tank brake line wiring harness or other vital vehicle system Do not run system wiring outside or underneath the vehicle This is an extremely dangerous practice which can result in severe damage to your vehicle and person e Protect all system wires from sharp metal edges and wear by carefully routing them tying them down and using grommets and loom where appropriate Do not mount the amplifier in the engine compartment under the vehicle on the roof or in any other area that will expose the amplifier circuitry to the elements l l D E E Low High 0 180 deg Off 30H2 Input Input Output Infrasonic Sens Voltage Polarity Filter 30 1 Monoblock Amplifier Speak
29. refer to Appendix D pages 20 21 SERVICING YOUR JL AUDIO AMPLIFIER If your amplifier fails or malfunctions please return it to your authorized JL Audio dealer so that it may be sent in to JL Audio for service There are no user serviceable parts or fuses inside the amplifier The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel Do not attempt to service the amplifier yourself or through unauthorized repair facilities This will not only void the warranty but may result in the creation of more problems within the amplifier If you have any questions about the installation or setup of the amplifier not covered in this manual please contact your dealer or technical support JL Audio Technical Support 954 443 1100 9 00 AM 5 30 PM Eastern Time Zone Monday Friday 16 JL Audio HD750 1 Owner s Manual APPENDIX A HD750 1 Specifications Amplifier Topology Class D switching type with patented Single Cycle Control technology Power Supply Pulse width modulation regulated switching power supply Recommended Fuse Value Type 60A AFS AGU or MaxiFuse Rated Power 750W RMS x 1 1 5 4O 11V 14 5V THD at Rated Power lt 0 03 40 Average at 1 kHz Signal to Noise Ratio 20 kHz Bandwidth Referred to Rated Power 111 dBA Referred to 1 Watt 82 2 dBA Frequency Response 6 Hz 8 kHz 0 1dB Damping Factor 2500 40 per ch 50 Hz
30. ry control labeled Input Sens Once the appropriate Input Voltage range has been selected this control can be used to match the source unit s output voltage to the input stage of each pair of amplifier channels for maximum clean output Rotating the control clockwise will result in higher sensitivity louder for a given input voltage Rotating the control counter clockwise will result in lower sensitivity quieter for a given input voltage To properly set the amplifier for maximum clean output please refer to Appendix C pages 18 19 in this manual 250 oc s Lov 0 Input t eq Hz Sens Vc HD750O 1 Monobloc After using this procedure you can then adjust the relative level by adjusting the input sensitivity downward if it requires attenuation to achieve the desired system balance Do not increase the Input Sens setting for any amplifier in the system beyond the maximum level established during the procedure outlined in Appendix C pages 18 19 Doing so will result in audible distortion and possible speaker damage CROSSOVER CONTROLS Crossovers are groups of electronic filters designed to control the frequency ranges that each speaker in a system will be tasked with reproducing Proper crossover setup is critical to sound quality and reliability The HD750 1 has one filter which can be configured as a high pass filter attenuates low frequencies or as a low pass filter attenuate
31. s high frequencies Additionally the user can select from a shallow 12dB octave filter slope or a more aggressive 24dB octave slope 500 12dB 24dB 60 m Off HP LP Filter Filter 50 Mode Slope Filter Freq Hz JL AUDIO HD75 1 Filter Mode Control this switch allows you to defeat or configure the filter into one of two filter types Off Defeats the filter completely allowing the full range of frequencies present at the inputs to feed the amplifier This is useful for systems utilizing outboard crossovers or requiring full range reproduction HP High Pass Configures the filter to attenuate frequencies below the selected filter frequency Useful for connection of component speakers in a bi amplified system LP Low Pass Attenuates frequencies above the selected filter frequency Useful for connection of subwoofer s in a bi amplified system 10 JL Audio HD750 1 Owner s Manual 2 Filter Slope Control This switch allows you to select from two filter slopes 12dB Configures the filter to attenuate frequencies above or below the selected filter frequency at a rate of 12 dB per octave Butterworth alignment 24dB Configures the filter to attenuate frequencies above or below the selected filter frequency at a rate of 24 dB per octave Linkwitz Riley alignment Depending on the speaker system and the vehicle different filter slopes may
32. tage for input sensitivity adjustment according to the nominal impedance of the speaker system connected to each set of outputs Nom HD 750 1 Impedance 80 54 8V 60 54 8V 40 54 8V 30 474V 20 38 7V 1 50 335V 6 Verify that you have disconnected the Speaker Connector Plug before proceeding Play a track with an appropriate sine wave within the frequency range to be amplified by each set of channels at 3 4 source unit volume 7 Connect the AC voltmeter to the Speaker Output contacts of the amplifier 8 Increase the Input Sens control until the target voltage is delivered If excessive voltage is read with the control at minimum full counterclockwise switch the Input Voltage switch to High and re adjust 9 Once you have adjusted the amplifier to its maximum unclipped output level reconnect the speaker s The Input Sens controls can now be adjusted downward if the HD750 1 requires attenuation to achieve the desired system balance APPENDIX D TROUBLESHOOTING How do properly set the input sensitivity on my amplifier Please refer to Appendix C pages 18 19 to set the input sensitivity for maximum low distortion output My amplifier doesn t turn on Check the fuse s not just visually but with a continuity meter It is possible for a fuse to have poor internal connections that cannot be found by visual inspection It is best to take the fuse out of the holder for
33. te turn on wire from the source unit or interface processor to the amplifier mounting location 5 Run speaker wire from the speaker systems to the amplifier mounting location 6 Find a good solid bare metal grounding point close to the amplifier and connect the negative power wire to it using appropriate hardware Use minimum 8 AWG power wire no longer than 36 inches 90 cm or 4 AWG wire up to 60 inches 150 cm long from the amplifier to the ground connection point In some vehicles it may be necessary to upgrade the battery s ground wire as well See pages 6 7 for important notice 7 Securely mount the amplifier using appropriate hardware See page 8 for detailed mounting instructions 8 Connect the remote turn on wire and the positive and negative power wires to the amplifier s power connector plug Then insert the power connector plug into the amplifier s power connector receptacle pushing firmly 9 Connect the RCA input cables to the amplifier 10 Connect the speaker wires to the speaker connector plug and insert the plug firmly into the speaker connector receptacle 11 Carefully review the amplifier s control settings to make sure that they are set according to the needs of the system 12 Install power wire fuse 60A for a single HD750 1 and reconnect the negative battery post terminal 13 Turn on the source unit at a low level to double check that the amplifier is configured correctly Resist the tempta
34. tic for the amplifier and your installation The control panel security cover is pre installed at the factory and must be temporarily removed for access to the controls described throughout this manual The security cover is secured by a single 2 5 mm hex head screw at the far right of the panel Loosen the hex head screw to release the security cover it is not necessary to completely remove the screw To re install the security cover once all adjustments have been made insert the tongue on the cover s left edge into the groove where the left side heatsink meets the control panel hinge the panel closed and secure the screw using the supplied 2 5 mm hex wrench Do not overtighten the screw Lateral Mounting Feet are also included with your HD750 1 to provide an alternative mounting option Each mounting foot should be attached to the bottom of the amplifier by screwing the provided bolt into the bottom of the amplifier and up into the corner cap with the supplied 1 8 inch hex wrench Next using appropriate mounting screws not included secure the amplifier by its four Lateral Mounting Feet E IMPORTANT Check before drilling any holes in your vehicle to make sure that you will not be drilling through a gas tank brake line wiring harness or other vital vehicle system 8 JL Audio HD750 1 Owner s Manual AMPLIFIER INPUTS The HD750 1 has a single input section consisting of a pair of RCA type input ja
35. tion to crank it up until you have verified the control settings 14 Make necessary adjustments to the input sensitivity controls to obtain the right overall output and the desired balance in the system See Appendix C pages 18 19 for the recommended input sensitivity setting method 15 Enjoy the fruits of your labor with your favorite music POWER AND TURN ON CONNECTIONS Before installing the amplifier disconnect the negative ground wire from the vehicle s battery This will prevent accidental damage to the system the vehicle and your body during installation e 12VDC Ground Remote 12V Battery Connection You will need to connect a power wire to the vehicle s positive battery terminal using an appropriate power ring or specialized battery terminal connector such as the JL Audio XB BTU This connection must be tight and corrosion free to ensure proper connectivity This wire MUST be fused appropriately for safety Any power wires run through metal barriers such as firewalls must be protected with a high quality insulating grommet to prevent damage to the insulation of the wire Failure to do so may result in a dangerous short circuit Power Wire Requirements The HD750 1 s 12 VDC and Ground connections are designed to accept 4 AWG power wire 4 AWG pure copper wire is recommended for any power wire run longer than 72 inches 180 cm For runs shorter th
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