HD Series Owner`s Manual
Contents
1. Front width 19 483mm gt HD2 9 Front View gt 2 E QD y Front width 19 483mm gt Rear Side Views HD2 9 HD12 HD18 Bottom p JU Ls ra LO LO i ali 5 gt gt LY lt AL gt gt Tum gt OS 1 gt 6 l 37 133mm HE Al H l o en Ca 3 Sio e PE T See appendix E for detailed drawing and information regarding model HD18 Page4 Crest Audio HD Series Power Amplifiers Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES Introduction Congratulations on your purchase of a new HD Series professional power amplifier and thank you for your confidence in Crest Audio products You are among the growing number of audio professionals who have made Crest Audio one of the world s leading suppliers of professional and commercial industrial audio sys tems For your safety please read the Important Precautions section before installing and operating the amplifier The Crest Audio HD Series is based on the same advanced circuit topologies that have made Crest ampli f2. PROFESSIONAL POWER AMPLIFIERS FM zig a oo OMMI AMO E 25 MIN e o ENT 1222 lili OWNER S MANUAL Important Precautions This symbol is used to alert the oper ator to follow important operating procedures and precautions detailed in documentation This symbol is used to warn opera tors that uninsulated dangerous volt ages are present within the equip ment enclosure that may pose a risk of electric shock Save the carton and packing material even if the equipment has arrived in good condition Should you ever need to ship the unit use only the original factory packing Read all documentation before oper ating your equipment Retain all doc umentation for future reference Follow all instructions printed on unit chassis for proper operation Do not spill water or other liquids into or on the unit or operate the unit while standing in liquid Make sure power outlets conform to the power requirements listed on the back of the unit Do not use the unit if the electrical power cord
3. Maintenance A HD Series amplifier requires no routine maintenance other than occasional cleaning or replacement of the fan intake filters on the rear of the amplifier These must be kept clear and clean to ensure proper ventilation through the unit If the amplifier is used in an extremely dusty or smoky environment the filter should be cleaned or changed frequently and the unit should be periodically blown free using compressed air of any foreign matter that may penetrated through the filter Users will not need to make any internal adjustments to the amplifier during its lifetime There are no user serviceable parts or adjustments that require opening the power amplifier Cover removal exposes the risk of shock so refer all servicing to qualified service technicians authorized by Crest Audio User Responsibility Your HD Series amplifier is very powerful and can be potentially dangerous to loudspeakers and operators alike It is your responsibility to read the section titled Important Precautions and make sure that the amplifier is installed wired and operated properly as instructed in this manual Many loudspeakers can be easily damaged or destroyed by overpowering especially with the high power available from a bridged amplifier Read the section on Speaker Protection and always be aware of the speaker s continuous and peak power capabilities Crest Audio is not responsible for damage to loudspeakers for any reason Service a
4. 1 28 0 80 0 51 11 9 77 5 0 3 2 2 0 1 20 22 14 6 9 6 6 2 4 0 2 4 Power Loss 4 ohm load 5 6 34 2 3 1 16 0 70 0 44 8 2 5 6 2 9 1 74 1 09 0 73 15 5 10 8 5 6 2 9 1 74 1 09 25 15 5 9 8 6 3 4 3 2 6 CREST AUDIO Power Loss 2 ohm load 3 2 2 0 1 28 0 80 0 51 6 2 4 0 2 5 1 60 1 01 2296 14 6 9 6 6 2 4 0 24 3796 26 17 8 11 8 Tel 4 7 Power Loss 2 ohm load 10 8 6 7 4 5 2 3 1 39 0 87 15 5 10 8 5 6 3 4 2 2 1 45 28 19 9 10 8 6 7 4 3 2 9 45 28 18 2 12 0 8 2 5 1 Crest Audio HD Series Power Amplifiers Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO D Ik 1 gt gt gt gt o gt pre Y at GAIN 40x 20x dBu XLR Pin 2 3 Ap TOA Appendix D Rear Panel Symbols Legend SERIES Input Connection Section XLR Connector Polarity Indicator TRS Connector Polarity Indicator Mode Selection Switch Bridged Mono Position Mode Selection Switch Parallel Position Mode Selection Switch Stereo Position Chassis Ground Lift Switch Grounded Lift Position Chassis Ground Lift Switch Grounded Position Output Connection Section Speakon Output Connector Channel A Stereo Parallel Speakon Output Connector Channel B Stereo Parallel Speakon Output Connector Bridged Mono 5 Way Binding Post Output Connection Channel A Stereo Parallel 5 Way B
5. HD6 HD9 HD12 HD18 CHEST AUDIO SERIES User Precautions Speaker Protection loudspeakers have electrical thermal and physical limits which must be observed to prevent damage or failure Cone or compression drivers can be damaged sometimes to the point of failure from excessive power low frequencies applied to high frequency drivers severely clipped waveforms and DC voltage HD Series amplifiers automatically protect speakers from DC voltages and subsonic signals For more information see the section on Protection Features Mid and high frequency transducers compression drivers in particular are highly susceptible to damage from overpowering clipped waveforms or frequencies below their rated passband When using an electron ic crossover make absolutely certain that the low and mid bands are connected to the correct amplifiers and drivers and not accidentally connected to those for a higher or lower frequency band The amplifier s clipping point is its maximum peak output power At maximum peak output power Crest Audio HD Series amplifiers will deliver more power than many speakers can safely handle Be sure the peak power capability of the amplifier is not excessive for your speaker system To ensure that the speakers never receive excessive power and to prevent amplifier clipping use a properly adjusted external limiter or a compressor with a ratio of 10 1 or higher to control power output Use one compressor
6. amp mode switches HD18 XLR polarity amp input sens voltage gain switches LED Indicators per channel Clip Limit Signal Temp DC Active Construction Steel chassis 16 gauge Double thickness in rack ear areas Dimensions Height x Width x Depth to rear rack ears 3 5 x 19 x 18 3 5 x 19 x 18 3 5 x 19 x 18 3 5 x 19 x 18 5 25 x 19 x 18 5 25 x 19 x 18 89 x 483 x 457mm 89 x 483 x 457mm 89 x 483 x 457mm 89 x 483 x 457mm 133 x 483 x 457mm 133 x 483 x 457mm Gross Weight 38 lbs 17 25 kg 46 Ibs 20 88 kg 49 Ibs 22 24 kg 5215 23 60 kg 72 Ibs 32 68 kg 82 Ibs 37 23 kg Net Weight 33 lbs 14 98 kg 41 Ibs 18 61 kg 44 Ibs 19 97 kg 47 Ibs 21 33 kg 67 lbs 30 42 kg 77 Ibs 34 96 kg Warranty 3 years 3 years 3 years 3 years 3 years 3 years For full power at 4 Ohms See table below for dealer configurable options Crest Audio reserves the right to make changes or improvements in manufacturing or design which may affect specification 1997 Crest Audio Inc 5 21 97 HD2 HD4 HD6 HD9 HD12 HD18 Gain Sens Gain Sens Gain Sens Gain Sens Gain Sens Gain Sens Factory Standard X45 775 X61 TISV X68 775 X86 5 775 97 5 75 115 175V Option 1 X40 866V X40 1 12V X40 1 32V X40 1 66V X40 1 87V X40 2 24V Option 2 20 1 73V 20 224 X20 2 65V X20 3 32V X20 3 74V X20 447N WW CEG Appendix A Crest Audio HD Series Power Amplifiers Models HD2 HD
7. 0kQ gt 10kQ gt 20kQ gt 10kQ gt 20kQ gt 10kQ gt 20kQ gt 10kQ gt 20kQ gt 10kQ Hum and Noise A weighted full powerat4O 105dB 105dB 105dB 105dB 105dB 115dB Crosstalk A weighted full power at 40 gt 6048 gt 6088 gt 6088 gt 6088 gt 6048 gt 8048 Class AB AB H H H H Input Connectors per channel Female XLR pin 2 configurable for pin 3 TRS tip Output Connectors per channel 5 way binding posts 2 pair on HD18 Filter Storage 20 000 uF 27 200 uF 68 000 uF 80 000 uF 140 000 uF 144 000 uF Power Supply factory configured 100V 240V 50 60Hz 100V 240V 50 60Hz 100V 240V 50 60Hz 100V 240V 50 60Hz 100V 240V 50 60Hz 100V 240V 50 60Hz Idle Current Draw 120V 1 2A 14 1 6A 2 04 2 84 3 04 1 8 Power Curr Draw typical music cond 120V 40 3 25A 6 8A 6 04 8 6A 10 5 12 0 1 3 Power Curr Draw cont music cond 120V 40 5 5A 10 0A 13 0A 16 0A 23 0A 25 0A Max Curr Draw continuous music cond 120V 40 9 0 15 0A 18 0A 21 0A 30 0A 36 0A Thermal Emissions 1 8 Power 40 1119 BTU hr 2030 BTU hr 2630 BTU hr 3250 BTU hr 4750 BTU hr 7125 BTU hr Thermal Emissions 1 3 Power 40 1607 BTU hr 2726 BTU hr 3713 BTU hr 4341 BTU hr 6300 BTU hr 9450 BTU hr Cooling Two rear panel variable speed DC fans filters detatchable without tools Controls Front panel 2 attenuators magnetic circuit breaker power switch Rear panel signal ground lift
8. 4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES Appendix B HD Block Diagram CHANNELA PREAMP NON INVERTED ATTENUATOR OUTPUT STAGE 1 INVERTED PIN2 3 P JUMPER ics die AMP FRONT END OUTPUT RELAY T PREAMP INCORPORATES INPUT BRIDGED SENSITIVITYNOLTAGE GAIN JUMPER 5 REAR PANEL SWITCH ON CA18 PARALLEL STEREO ATTENUATOR OUTPUT STAGE SWITCH PREAMP CHANNEL B AMP FRONT END OUTPUT RELAY B NON INVERTED B INVERTED PIN 2 34 JUMPER REAR PANEL SWITCH Crest Audio HD Series Power Amplifiers Appendix B Models HD2 HD4 HD6 HD9 HD12 HD18 SERIES Stranded Cable Lgth ft 5 10 40 80 Stranded Cable Lgth m 2 10 30 Appendix C Appendix C Wire Gauge Charts Wire Gauge AWG 18 16 14 12 10 18 16 14 12 10 18 16 14 12 10 8 18 16 14 12 10 8 Wire Gauge mm 0 3 0 5 0 75 1 5 25 4 0 5 0 75 1 5 25 4 6 0 5 0 75 1 5 2 5 4 6 075 1 5 2 5 10 Power Loss 8 ohm load 0 8196 0 51 0 32 0 20 0 128 1 6196 1 02 0 64 0 40 0 25 6 296 4 0 2 5 1 60 1 01 0 60 11 9 77 5 0 3 2 2 0 1 20 Power Loss 8 ohm load 2 996 1 74 1 16 0 58 0 35 0 22 4 396 2 9 1 45 0 87 0 55 0 37 8 2496 5 6 2 9 1 74 1 09 0 73 15 596 8 2 5 1 32 2 2 1 31 Power Loss 4 ohm load 1 61 1 02 0 64 0 40 0 25 3 2 2 0
9. 950W 40 Stereo Power 200W 400W 500W 800W 1100W 1700W 20 Stereo Power N A 450W 600W 900W 1100W 2400W 80 Bridged Mono Power 450W 800W 1000W 1600W 2200W 3400W 40 Bridged Mono Power N A 900W 1200W 1800W 2200W 4800W Max RMS Output Voltage each channel 44V 58V 73V 82V 90V 99V Max Peak Output Voltage 62 82V 103V 116V 126V 140V Frequency Response 0 0 3dB 1W 80 20Hz 20kHz 3dB 135kHz 20Hz 20kHz 3dB 135kHz 20Hz 20kHz 3dBe135kHz 20Hz 20kHz 3dBe 135kHz 20Hz 20kHz 34B 135kHz 20Hz 20kHz 3dB 150kHz Power Bandwidth rated power at 40 1 THD N 20Hz 20kHz 94B 15dB 20Hz 20kHz 9dB 4 5dB 20Hz 20kHz 1 1dB 0dB 20Hz 20kHz 84dB 0dB 20Hz 20kHz 23dB 85dB 20Hz 20kHz 2dB 2dB TourClass Protection ACL IGM AutoRamp short circuit DC voltage turn on off transient current inrush sub ultrasonic input THD N rated power 40 IKHz 0 0196 0 0196 0 0196 0 0196 0 0196 0 0396 SMPTE IMD rated power 80 60 Hz amp 7kHz 0 0196 0 0196 0 0196 0 0196 0 0196 0 0196 Damping Factor 10 400Hz at 80 368 1 550 1 400 1 700 1 800 1 800 1 Input CMRR 1kHz 60dB 60dB 60dB 60dB 60dB gt 70dB Standard Input Sensitivity rated power at 80 0 775V 0 775V 0 775V 0 775V 0 775V 0 775V Standard Voltage Gain rated power 80 X45 X61 X68 X86 5 X97 5 115 Input Impedance balanced unbalanced gt 20kQ gt 10kQ gt 2
10. a ture Drawn in by dual 45 cubic feet per minute CFM fans on the rear panel air flows through the cooling fins of the channel heat sinks dissipating power transistor heat then exhausts through the front panel slots The intelligent variable speed DC fans are controlled by heat sink temperature sensing circuits When the amplifier is turned on the fans briefly up then slow to an idle this indicates that the temperature sensing circuits are operating normally The fan speed increases only as required by heat sink temperatures keeping fan noise to a minimum Under extreme thermal load the fans will force a very large volume of air through the heat sinks If either heat sink surpasses the maximum allowed temperature the sensing circuit will open the output relay disconnecting the load from that channel If the power transformer overheats another sensing circuit opens both channel output relays until the transformer cools to a safe temperature IMPORTANT To ensure optimum cooling periodically clean the amplifier fan filters removable without tools Also make certain that there is enough space around the front of the amplifier to allow the cooling air to escape If the amplifier is rack mounted do not use doors or covers on the front of the rack the exhaust air must flow out without resistance If the amplifiers are to be housed in racks with closed backs allow at least one 1 standard rack space of opening in the front of the
11. ction of internal amplifier circuits and all connected loads ACL Active Clip Limiting At the amplifier s full power limit or clipping point ACL will be activated This is indicated by illumina tion of the Clip LED The channel gain is automatically reduced protecting the loudspeakers from potential damage from the high power continuous square waves that would otherwise be produced ACL may be activated by uncontrolled feedback oscillations improper equipment gain settings or an equipment mal function upstream from the amplifier Only steady or excessive clipping not normal program transients will trigger ACL The circuit is virtually transparent in operation and full signal bandwidth is maintained IGM Impedance Sensing IGM Instantaneous Gain Modulation is an innovative circuit that allows the amplifier to operate safely into loads as low as 2 ohms When the amplifier sees a load that overstresses the output stage the IGM cir cuit adjusts the channel gain to a safe level Like ACL the IGM circuit is inaudible in normal use In addi tion if extreme and sustained low impedance is encountered the amplifier s output relay will open AutoRamp Protection AutoRamp operates every time the amplifier is turned on or is reactivated after a protect condition is cor rected This exclusive Crest Audio feature gradually increases gain to the attenuator setting avoiding unnec essary stress on the loudspeakers Thermal Protection Abnor
12. h to the lift position if the amplifier and the signal source equipment are on the same AC ground Should the ground loop problem persist after the ground lift switch has been set to the lift position then the shield on bal anced input lines should be grounded at one end only usually the signal source Crest Audio HD Series Power Amplifiers Page 7 Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES 13 14 Balanced 1 4 TRS amp XLR Input Connectors Tip Positive Ring Negative Sleeve Ground 4 i These connectors accept input signals on balanced TRS and XLR input plugs See the figure at the left for information on polarity Connectors for each chan nel are in parallel the unused connectors may be used for loop through nection to other amplifiers Note Unbalanced Tip Sleeve plugs may be used with the balanced TRS Tip Ring Sleeve connectors The ring terminal or negative input will be connected to ground internally When using three pole stereo TRS connec tors make sure that the ring connection is made either to the cold output of 1 Ground the source equipment or to ground Incorrect connections may cause a 6dB loss in level 3 Negative 2 Positive 15 Fan Inlet Ports amp Filters Cooling air enters the amplifier through the fan inlet ports located on the rear of the amplifier chassis Be sure not to block these port
13. iers the choice of touring professionals worldwide HD Series amplifiers are designed for high operating efficiency and accurate sonic performance across the full audio bandwidth even under stressful conditions In order to maintain strict quality assurance standards all HD Series amplifiers are built in Crest s state of the art USA manufacturing facility Internal components are the finest available and key sub assemblies are pre tested before final assembly Finally each amplifier is burned in and thoroughly tested using preci sion audio test equipment before shipping In addition all HD Series amplifiers incorporate Crest s exclu sive TourClass protection features to safeguard both internal circuitry and connected loudspeakers This proven combination of advanced design quality construction and comprehensive circuit protection is your guarantee of fail safe reliability You can depend on consistent stable performance even when your HD Series amplifier is subjected to punishing extremes in the most demanding fixed or mobile sound rein forcement applications Unpacking Please inspect the amplifier carefully immediately after unpacking If you find any damage notify your sup plier dealer immediately Only the shipper may file a damage claim with the carrier for damage incurred during shipping Be sure to save the carton and all packing materials for the carrier s inspection If your packing materials are in good condition please save
14. inding Post Output Connection Bridged Mono 5 Way Binding Post Output Connection Channel B Stereo Parallel Crest Audio HD Series Power Amplifiers Appendix D Models HD2 HD4 HD6 HD9 HD12 HD18 HD18 Power Amplifier Special Functions AUDIO SERIES The HD18 rear panel features external switches for the following XLR Pin Switch This switch configures XLR input connection polarity Either pin 2 or pin 3 may be selected as the hot pin Amplifiers are shipped pin 2 hot from the factory Gain Switch This switch permits the amplifier to be configured for the standard input sensitivity 775V for rated power 8Q or for optional voltage gains of X40 or X20 Refer to the specifications for input sensitivity values at optional voltage gains of X40 and X20 NOTE Two pairs of 5 way binding posts are provided for each channel so that paralleling of speakers is possible i ALWAYS power down the amplifier before changing settings with either the XLR Pin switch or the Gain switch S amp S HD18 Rear View 7 gt uy gt Au E 9 J M P XLR Pin Switch Gain Switch Appendix E Crest Audio HD Series Power Amplifiers Models HD2 HD4 HD6 HD9 HD12 HD18 Three Year Power Amplifier Warranty Warranty Information Crest Audio Inc warrants to the
15. is frayed or broken The power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them paying particular atten tion to cords and plugs convenience receptacles and the point where they exit from the appliance Always operate the unit with the AC ground wire connected to the electri cal system ground Precautions should be taken so that the means of ground ing of a piece of equipment is not defeated Mains voltage must be correct and the same as that printed on the rear of the unit Damage caused by connec tion to improper AC voltage is not cov ered by any warranty Have gain controls on amplifiers turned down during power up to pre vent speaker damage if there are high signal levels at the inputs 10 11 12 13 14 15 16 17 18 19 Power down amp disconnect units from mains voltage before making connec tions Never hold a power switch in the ON position if it won t stay there itself Do not use the unit near stoves heat registers radiators or other heat producing devices Do not block fan intake or exhaust ports Do not operate equipment on a surface or in an environment which may impede the normal flow of air around the unit such as a bed rug weathersheet carpet or completely enclosed rack If the unit is used in an extremely dusty or smoky environ ment the unit should be periodically blown f
16. l damages so the above limitations or exclusions may not apply to you This warranty gives you specific legal rights you may have other legal rights that may vary from state to state or province to province For warranty service the equipment and a photocopy of the original Bill of Sale should be delivered at the owner s expense to an Authorized Crest Audio Service Center or to Crest Audio at the address on the back cover of this manual Collect shipments will not be accepted Original equipment boxes should be used for shipping If the original boxes are not available replacement shipping boxes may be ordered from Crest Audio at the customer s expense The names and addresses of Authorized Crest Audio Service Centers are available from Crest Audio dealers and distributors or by contacting the factory directly If the equipment is returned to Crest Audio or one of its Service Centers and is determined by Crest Audio to be under warranty the equipment will be returned after servicing regular surface freight prepaid to the original owner or dealer Crest Audio Inc reserves the right to make changes or improvements in design or manufacturing without assuming any obligation to change or improve products previously manufactured Crest Audio HD Series Power Amplifiers Appendix F Models HD2 HD4 HD6 HD9 HD12 HD18 CREST AUDIO Crest Audio Inc 100 Eisenhower Dr Paramus NJ 07652 USA TEL 201 909 8700 FAX 201 909 8744 http www cres
17. limiter for each frequency band in systems with active electronic crossovers The ACL clip limiting circuit will automatically limit the duration of squared off continuous waveforms applied to the speakers The amplifier will however allow normal musical transient bursts to pass Of course when the amplifier does clip it is operating at its maximum output power Note that some speaker systems are packaged with proprietary processors that have power limiting circuits and therefore should not require additional limiting Do not drive any low frequency speaker enclosure with frequencies lower than its own tuned frequency the reduced acoustical damping could cause a ported speaker to bottom out even at moderate power Consult the speaker system specifications to determine its frequency limits and employ a roll off filter if necessary Recommended Speaker Cabling The wire gauge charts will assist you in determining the optimum copper wire gauge for your speaker cables Remember that the speaker cable resistance robs amplifier power in two ways through power lost directly to resistance often referred to as PR loss and through increased total load resistance which decreases the amount of power available from the amplifier The charts Appencix C give cable length fig ures in feet AWG wire gauges and in metric values Page 14 Crest Audio HD Series Power Amplifiers Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES
18. low unrestricted air flow 4 AC Power Switch Circuit Breaker Granit Line amplifiers have a front panel combination AC switch and circuit breaker No fuses are used If the switch shuts off during normal use push it back to the ON position once If it will not stay on the amplifier needs servicing 5 Active LED Indicates that AC power is connected and the amplifier is turned on 6 Protect LED Indicates that the channel is in Protect mode speakers disconnected by output relay 7 Clip LED Illuminates at the clipping threshold Continuous illumination also indicates that ACL Active Clip Limiting protection circuitry is engaged 8 Signal LED Illuminates to indicate that a signal above a minimum threshold is present at the amplifier input and that the signal is being amplified 9 Input Attenuators Two input attenuators adjust level for their respective amplifier channels In Bridged Mono Mode both attenuators are used to control signal level and must be adjusted to the same setting Page 6 Crest Audio HD Series Power Amplifiers Models HD2 HD4 HD6 HD9 HD12 HD18 0065 Never connect a hot red output to ground or to another hot red output SERIES Rear Panel See Appendix E for information specific to model HD18 10 Output Connectors Your amplifier is supplied with 5 way Output Binding Posts Connection to the binding posts can be made with bare wire banana plugs
19. mally high heat sink temperatures will engage the Protect circuit for the overheating channel only An output relay disconnects the loudspeakers until nominal temperature range is restored During this time the Protect LED will light If the power transformer gets too hot its thermal sensing circuit will dis connect both channel outputs During this time the Active LED will extinguish the Protect and Clip LEDs will stay lit and the cooling fan will continue running at low speed Normal operation resumes once the transformer cools to a safe level Short Circuit If an output is shorted i e defective speakers or crossed speaker wires the and thermal circuits will automatically protect the amplifier The IGM circuit senses the short circuit as an extremely stressful load condition and attenuates the signal protecting the channel s output transistors from over current stress If the short circuit remains the load will be disconnected by the thermal protection circuitry output relay opens DC Voltage Protection If an amplifier channel detects DC voltage at its output terminals the output relay will immediately open to prevent loudspeaker damage The Protect LEDs will light Subsonic Frequencies Built in high pass filtering provides subsonic frequency protection for each channel In addition a relay will open if excessive subsonic energy appears at the output Crest Audio HD Series Power Amplifiers Page 13 Models HD2 HD4
20. nd Repair In the unlikely event that your amplifier develops a problem it must be returned to an authorized distributor service center or shipped directly to our factory To obtain service contact your nearest Crest Audio Service Center Distributor Dealer or any of the worldwide Crest Audio offices For contact information reach Crest Audio Inc Customer Service directly at TEL 201 909 8700 USA Fax 201 909 8744 USA Because of the complexity of the design and the risk of electrical shock all repairs should be attempted only by qualified technical personnel If the unit needs to be shipped back to the factory it must be sent in its original carton If improperly packed your amplifier may be damaged For those with Internet access please visit the Crest Audio website at http www crestaudio com Crest Audio HD Series Power Amplifiers Page 15 Models HD2 HD4 HD6 HD9 HD12 HD18 Appendices Appendix A Amplifier Specifications SERIES 1kHz 0 01 THD N HD2 HD4 HD6 HD9 CREST AUDIO HD12 HD18 80 Stereo Power 160W 250W 400W 600W 700W 1000W 03 THD N 40 Stereo Power 250W 435W 600W 900W 1200W 1800W 03 THD N 20 Stereo Power N A 500W 750W 1000W 1400W 2500W 03 THD N 80 Bridged Mono Power 500W 830W 1200W 1800W 2400W 3600W 03 THD N 40 Bridged Mono Power N A 1000W 1500W 2000W 2800W 5000W 03 THD N 20Hz 20kHz 0 1 THD N 8Q Stereo Power 150W 245W 350W 550W 650W
21. ndependently with their input attenuators controlling their respec tive levels Signal at Channel A s input produces output at Channel A s output while signal at Channel B s input produces output at Channel B s output Recommended minimum nominal load impedance for stereo operation is 2 ohms per channel Either the 1 4 TRS inputs or the XLR inputs may be used Parallel Mode When set to Parallel Mode a signal applied to Channel A s input will be amplified and appear at outputs for both Channels A amp B Either the 1 4 TRS input or the XLR input on Channel A may be used Bridged Mono Mode Bridged Mono Mode straps both amplifier channels together to make a very powerful single channel monaural amplifier One channel pushes and the other pulls equally doubling the power over that of either channel alone Signal is applied to the Channel A input only Both attenuators are used to control sig nal level in addition both must be adjusted to the same setting Either the 1 4 TRS or XLR input may be used NOTE The channel B input connectors XLR and or TRS may be used to Loop Thru the channel A sig nal when in parallel or bridged mono mode Use extreme caution when operating the amplifier in Bridged Mono Mode Never ground either side of the speaker cable when the amplifier is in Bridged Mono Mode both sides are hot If an output patch panel is used all connections must be isolated from each other and from the pa
22. nel The recommended minimum nominal load impedance in the Bridged Mono Mode is 4 ohms which is the equivalent to driving both channels separately at 2 ohms Driving bridged loads of less than the recommended minimums will activate the IGM circuitry resulting in a loss of power and may also lead to a thermal protect condition See figures on page 12 showing output connection information 4 Connecting amplifier outputs to oscilloscopes or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test equipment Crest Audio HD Series Power Amplifiers Page 11 Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES Stereo Mode Connections 5 Way Output Binding Posts Parallel Mode Connections 5 Way Output Binding Posts Bridged Mono Mode Connections 5 Way Output Binding Posts Bridged Mono Page 12 Crest Audio HD Series Power Amplifiers Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES TourClass Protection Features Every model in the HD Series incorporates TourClass protection features Derived from Crest Audio s extensive experience with the world s largest sound rental companies the TourClass group of circuits sets the industry standard for assured prote
23. or spade lug terminations Make connections to both the Channel A and Channel B terminals for Stereo or Parallel Mode or a single connection across the red hot terminals only of Channels A and B for Bridged Mono Mode See Appendix D and the section on Mode Selection for more information NOTE on the HD18 two pairs of 5 way binding posts are provided for each channel so that paralleling of speakers is possible 11 Mode Selection Switch This recessed three position switch configures the amplifier for Stereo Parallel or Bridged Mono Mode operation Amplifiers are factory configured for Stereo Mode See Appendix D and the section on Mode Selection for more information 12 Signal Ground Lift Switch The recessed signal ground lift switch is factory set to the ground bottom position which electrically connects the signal ground to the chassis AC ground The top position lifts the amplifier s signal ground In a properly designed system for safety purposes and to minimize noise the amplifier should be connected to ground through the AC line cord Also whenever possible the signal source equipment should share the same AC ground as the amplifier In some cases this may not be possible and a ground loop results If this happens the first step is to move the ground lift switch to the top lift position In this position the signal ground is lifted and completely isolated from the chassis AC ground Do not change the switc
24. original purchaser of any HD Series Crest Audio Amplifier purchased at an Authorized Crest Audio dealer that it will be free from defects in material and workmanship for a period of three 3 years from the date of purchase Crest Audio its distributors or one of its authorized Service Centers will at its option repair or replace any unit or component covered by this warranty which becomes defective or malfunctions under normal use ser vice during the period of this warranty at no charge for parts or labor to the original owner This warranty does not cover damage from shipping accidents misuse abuse operation with incorrect AC voltage operation with faulty associated equipment modification or alteration without prior factory approval service by an unauthorized Service Center and normal wear and tear Units on which the serial number has been removed or defaced are not eligible for warranty service Evidence of alteration erasing or forgery of proof of purchase documents will be cause to void the warranty Any implied warranties including warranties of merchantability and fitness for a particular use shall be limited in duration to the period of time set forth above Crest Audio is not responsible for any incidental or consequential damages with respect to the products warranted Some states or provinces do not allow limitations on how long an implied warranty lasts or do not allow the exclusion or limitation of incidental or consequentia
25. quipment does not appear to operate normally or exhibits a marked change in performance E The equipment has been dropped or the enclosure damaged To obtain service contact your nearest Crest Audio Service Center Distributor Dealer Crest Audio at 201 909 8700 USA CREST Power Amplifier Owner s Manual AUDIO SERIES Table of Contents Introduction 5 Unpacking 5 Installation and Mounting 5 Front Panel 6 Back Panel 7 Internal Configuration and Control 8 Operation 9 Connecting Power Circuit Size Requirements 9 Cooling Requirements 9 Connecting Inputs 10 Connecting Outputs 10 Mode Selection 11 Stereo Parallel Bridged Mono Connections 12 TourClass Protection Features 13 User Precautions 14 Speaker Protection 14 Recommended Speaker Cabling 14 Maintenance 15 User Responsibility 15 Service and Repair 15 Appendix A Specifications Appendix B HD Block Diagram Appendix C Wire Gauge Charts Appendix D Rear Panel Symbols Legend Appendix E HD18 Special Functions Appendix F Warranty Information Crest Audio HD Series Power Amplifiers Page 3 Models HD2 HD4 HD6 HD9 HD12 HD18 SSA HD12 18 Front View Front UUUUUUUUUUUUUU o 6 Pp Se UUU UUUUUU height o 6 E Ji 5 25 Cha Ls 133mm UU UUUUUUUUUUU ol Ame 2 02 2 107 V UUUUUUUUUUUUUUUU 3 0 che
26. rack for every four amplifiers Crest Audio HD Series Power Amplifiers Page 9 Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES Connecting Inputs Use either the XLR or 1 4 inch input connectors on the rear to supply audio signals to your Crest Audio HD Series amplifier Both connectors accept balanced and unbalanced audio connections The HD Series amplifiers are configured standard with Pin 2 hot on XLR inputs Please note that some other Crest Audio amplifiers are configured with Pin 3 hot The unused connector can be used to jumper the audio input to another amplifier input For more information see the sections on Balanced 1 4 TRS amp XLR Input Connectors Input XLR Polarity and Input Sensitivity Connecting Outputs Speakers are connected using 5 way Output Binding Posts Please note that on the HD18 two pairs of 5 way binding posts are provided for each channel so that paralleling of speakers is possible For more information see the sections on Output Connectors and Mode Operation and the figures on page 12 10 Crest Audio HD Series Power Amplifiers Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES Mode Selection The three position recessed Mode Select switch located on the rear panel configures the amplifier for either Stereo Parallel or Bridged Mono Mode Amplifiers are factory configured for Stereo Mode Stereo Mode In Stereo Mode both channels operate i
27. ree of foreign matter Do not remove the cover Removing the cover will expose you to potentially dangerous voltages There are no user serviceable parts inside Connecting amplifier outputs to oscilloscopes or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test equipment Do not drive the inputs with a signal level greater than that required to drive equipment to full output Do not connect the inputs outputs of amplifiers or consoles to any other voltage source such as a battery mains source or power supply regard less of whether the amplifier or console is turned on or off Do not run the output of any amplifi er channel back into another chan nel s input Do not parallel or series connect an amplifier output with any other amplifier output Crest Audio is not responsible for dam age to loudspeakers for any reason Do not ground any red hot ter minal Never connect a hot red output to ground or to another hot red output 20 21 22 Non use periods The power cord of equipment should be unplugged from the outlet when left unused for a long period of time Service Information Equipment should be serviced by qualified service personnel when A The power supply cord or the plug has been damaged B Objects have fallen or liquid has been spilled into the equipment C The equipment has been exposed to rain D The e
28. s when installing the amplifier or other associated equipment Air must flow unimpeded through these ports Removable fan filters are provided to minimize entry of dust and dirt Internal Configuration and Control Input XLR Polarity HD Series amplifiers are supplied standard with the XLR configured as Pin 2 hot On models HD2 HD4 HD6 HD9 and HD12 an internal jumper makes it possible to alter the amplifier to Pin 3 hot NOTE This jumper is NOT user configurable Please consult your supplier or lohdl Crest Audio service center if you wish to have the input XLR polarity changed On the HD18 an external XLR polarity switch is featured See Appendix E Input Sensitivity The HD Series amplifiers have a standard input sensitivity of 775 Volts for rated power at 8 Ohms Models HD2 HD4 HD6 HD9 and HD12 are fitted with an internal jumper which allows optional gains of X20 or X40 Model HD18 features an external voltage gain input sensitivity switch See Appendix E Standard and optional voltage gains input sensitivities are detailed below HD2 HD4 HD6 HD9 HD12 HD18 Gain Sens Gain Sens Gain Sens Gain Sens Gain Sens Gain Sens Std X45 TI3V X61 775 X68 T 5N X86 5 775V X97 5 775 X115 75 Opt 1 X40 866V X40 1 12V X40 1 32V X40 1 667 X40 1 87 X40 2 24V Opt 2 X20 1 73V X20 2 24V X20 2 65V X20 3 32V X20 3 74V X20 441V NOTE This jumper is NOT user configurable Please consult your supplier or local Cres
29. t Audio service center if you wish to have the voltage gain input sensitivity changed Page 8 Crest Audio HD Series Power Amplifiers Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES Operation Connecting Power Circuit Size Requirements HD Series amplifier power requirements are rated at a idle b 1 8th power typical music conditions c 1 3rd power continuous music conditions d maximum rated power The maximum power current draw rating is limited only by the front panel circuit breaker Consult the spec ifications in the Appendices section for figures on the current that each amplifier will demand Make sure the mains voltage is correct and is the same as that printed on the rear of the amplifier Damage caused by connecting the amplifier to improper AC voltage is not covered by any warranty Unless other wise specified when ordered Crest amplifiers shipped to customers are configured as follows North America 120VAC 60Hz Europe 230V AC 50Hz Asia 220V AC 50Hz Australasia 240V AC 50Hz South America 120VAC 60Hz or 220V AC 50Hz Japan 100VAC 50Hz Note Always turn off and disconnect the amplifier from mains voltage before making audio connections Also as an extra precaution have the attenuators turned down during power up Cooling System and Requirements HD Series amplifiers use a twin tunnel forced air cooling system to maintain a low even operating temper
30. taudio com Printed in USA C4400001 v 1 2 10 22 97 Choice of touring professionals
31. them If you ever need to ship the unit back to Crest Audio or an authorized service center you should use only the original factory packing Installation and Mounting Four HD Series amplifiers are 2 rack space units models 2 4 6 and 9 The HD Series models 12 and 18 are 3 rack spaces high All mount in standard 19 inch racks Four front panel mounting holes are provided on each amplifier Rear mounting ears give additional support and use of rear supports is highly recom mended in all mobile and touring sound systems Optional rack mount handles are available Dimension drawings are included on page 4 Crest Audio HD Series Power Amplifiers Page 5 Models HD2 HD4 HD6 HD9 HD12 HD18 CHEST AUDIO SERIES Front Panel PUER iii lari O PENAS O 1 Rack Mounting Ears Two front panel mounting holes are provided on each mounting ear Never try to hold the 2 Optional Rack Handles circuit breaker power E switch in the ON Available from your authorized supplier position if it won t stay 3 Fan Outlet Grills there itself Granit Line amplifiers are cooled by two rear mounted fans Cool air flows over the heat sinks and exhausts through the front grills Make sure these outlets remain clear to al
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