Niles Audio SI-275 Car Amplifier User Manual
Contents
1. DD 3 5 mm mini jack for 12V DC control output NILES Level Adjustment screws enable you to preset the maximum system volume or match levels with another amplifier 7 e ya gt Z e ra m 2 gt 7 az 2 gt Z m m ww m m N o A ER RE EWIN R NILES SPEAKERS eo RIGHT NOTE AC receptacle must be easily accessible Binding posts for speaker connections IEC receptacle for AC power cord Z ez gt gt e Z INSTALLATION Page 11 Setting the Turn On Mode Page 13 Line Level Audio Inputs Switch Page 11 Control Output Page 13 Cascade Audio Outputs Page 14 AC Power plug Page 12 Speaker Wire Connections Setting the Turn On Mode Switch The SI 275 has three turn on modes Select which mode you desire by sliding the mode switch See Installation Considerations on page 6 for more information about each of the turn on modes TURN ON MODE AUDIO SENSE 3 30V AC DC CONSTANT Bm TRIGGER INPUT Slide the switch with your fingernail or a 1 8 slotted screwdriver blade Control Output This terminal provides a 12V DC signal suitable for triggering Niles automated switchers some motorized screens some electric curtain controls etc The trigger volt age is present only when the amplifier is active or on When the amplifier turns2. LA FICHE DANS LA BOURNE CORRESONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND WARNING TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE INTRODUCTION The SI 275 is a member of the award winning Niles Systems Integration Amplifier family It is designed for home theaters and whole house audio systems requiring high power Niles specifically created Systems Integration Amplifiers to solve the problems of interfacing with different brands and models of equipment different acoustic environments in different rooms and different kinds of applications home theater stereo and background music The SI 275 brings extremely high current power to a custom installed A V System in a remarkably convenient way SI 275 Systems Integration Stereo Power Amplifier zZ 7 e e e a e Z mm gt Cc ra rm N gt Z e vs mm ya m au N FEATURES AND BENEFITS Real World Power The SI 275 delivers 75 watts per channel at 8 ohms and 120 watts per channel at 4 ohms You ll get tremendous bass and dynamics from every pair of speakers powered by an SI 275 Transparent Sound The audio circuitry of the SI 275 is constructed using the finest parts available including 1 metal film resistors high quality capacitors and oversized heat sinks All this attention to technical detail creates a sound that is clear and uncolored with phenomenal imaging Freedom f
3. two inches of each conductor are separated B Strip one half inch of insulation from the end of each conductor of the speaker wire C Attach banana plugs or twist the strands of wire together and insert them into the appropriate binding post Line Level Audio Input CAUTION THE AMPLIFIER MUST BE OFF WHENEVER YOU MAKE CHANGES TO THE INPUT CONNECTIONS DESCRIPTION 1 Label all of the interconnecting Use audio patch cables with RCA phono cables for the sources they connect to plugs attached to the ends Z ez 2 gt gt e Z Connect outputs from your sources to 2 Connect the sources by inserting the inputs on the amplifier Never connect a RCA plugs into the amplifier s jacks source or preamplifier s input e g record inputs to the inputs of your SI 275 Cascade Audio Outputs The Cascade Audio Outputs enable you to connect another amplifier to your preamplifier output The connectors are gold plated RCA phono jacks Connect them to another amplifier s inputs with a standard audio patch cable The outputs are not buffered if you wish to daisy chain more than 5 Niles amplifiers you will need a Niles AVDA 3 buffered distribution amplifier A single AVDA 3 will allow you to daisy chain 5 amplifiers from each of its three outputs allowing 30 SI 275 power amplifiers to be fed from the same master preamplifier If your preamp has a vacuum tube output stage you must use a Niles A
4. 275 amplifier Niles SI 275 Niles HPS 6 Speaker Selection System E mua ie Rewa ted ee REZA kiran WE oO l e II le jl jl e oQ Il o9 lI eOe eO eO eO Speaker selection systems allow each pair of speakers to be turned on and off from your equipment location or even via remote control Cable and Wire It will be easier to reconfigure or troubleshoot your system in the future if you label the cables and wires for their destination or source rather than which ter minal of the SI 275 they are connected to The SI 275 connects to your sources via shielded line level audio cables with RCA phono plugs Use high quality cables with your Niles amplifier for the low est possible noise and best overall performance Your Niles dealer can recom mend the proper cable The SI 275 connects to your speakers using 2 conductor speaker wire For most applications we recommend you use 16 or 18 gauge wire For wiring runs longer than 80 feet we recommend 14 gauge wire The binding posts of the SI 275 will accommodate up to 12 gauge wire Larger sizes can be accommodated by attaching banana plugs to the wire Note that the bindi
5. INSTALLATION amp OPERATION GUIDE Systems Integration Amplifier BLENDING HIGH FIDELITY AND ARCHITECTURE CONGRATULATIONS Thank you for purchasing the Niles SI 275 one of the most flexible and conve nient amplifiers ever offered Like all Niles products the SI 275 is built to the highest standards of quality control and reliability With proper installation and operation you ll enjoy years of trouble free use TABLE OF CONTENTS INTRODUCTION 2 FEATURES AND BENEFITS 3 INSTALLATION CONSIDERATIONS 5 FRONT AND REAR PANEL DETAILS 9 INSTALLATION 11 OPERATION 15 TROUBLESHOOTING GUIDE 16 SPECIFICATIONS 18 The lightning flash with arrowhead symbol within an equi CAUTION lateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute CAUTION TO REDUCE THE y 9 a risk of electric shock to persons RISK OF ELECTRICAL SHOCK DO NOT REMOVE COVER NO USERSSERVICEABLE The exclamation point within an equivalent triangle is PARTS INSIDE REFER intended to alert the user to the presence of important SERVICING TO QUALIFIED operating and maintenance servicing instructions in the SERVICE PERSONNEL literature accompanying the appliance CAUTION TO PREVENT ELECTRICAL SHOCK MATCH WIDE BLADE OF PLUG TO WIDE SLOT FULLY INSERT ATTENTION POUR EVITER LES CHOCS ELECTRIQUES INTRODUIRE LAME LA PLUS LARGE DE
6. POSSIBLE CAUSES AND TEST PROCEDURE No sound on one channel Short circuit or loose wire at the speaker or amplifi er terminals Check that the connections are secure and that there are no loose strands of wire crossing from the positive to the negative terminals at the back of the amplifier and or the speaker _ 7 e Cc lez m ez I e e Z e 2 Cc J mm Short circuit or a break in the speaker wire Dis connect the speaker wire at both ends separate the 2 conductors at both ends and test with a meter for a short circuit If there is no short connect the two conductors at one end and test with a meter for continuity Speaker is not working Connect the speaker to a channel that plays another speaker Audio cable to input is bad Connect another cable that is known to be good Audio cable to the main inputs is bad Connect No sound on both channels another cable that is known to be good Hum may be caused by a ground loop between two of the other components in the system To test Hum from the speakers for another ground loop try reversing the AC plugs of each of the components in the system 7 e ea es m m cA I e e Z 9 2 Cc iS m TROUBLESHOOTING GUIDE continued SYMPTOM Hum from the speakers POSSIBLE CAUSES AND TEST PROCEDURE Check for faulty cables faulty source material an ungrounded phono system or a defective component Amp w
7. VDA 3 to drive more than a single SI 275 AC Power Plug Plug the female IEC socket of the sup plied AC cord into the IEC receptacle on the rear of the amplifier DESCRIPTION Just like a computer or printer the SI 275 has an AC cord which unplugs either at the amp or at the wall for your convenience Plug the two prong plug into a correctly grounded 120V 60 Hz wall outlet If you use a grounded power strip surge suppressor or extension cord verify that proper ground is maintained CAUTION Typically the preamp receiver s switched outlet is not rated for a power amplifier The SI 275 draws a maximum of approxi mately 700 watts from an AC wall outlet Use the auto turn on circuit instead Z N gt m gt e zZ e m raz gt e Z OPERATION Power Switch The front panel switch is a master or vacation power switch No matter which turn on mode you have selected the master power switch will turn off all circuit ry including the sensing circuitry If you will not be using the amplifier for an extended period of time turn the master power switch Off push button switch out When you would like to return to normal operation turn the switch On push button switch in Important Notes Equipment is not completely disconnected from main power source when power switch is in the OFF position Power LED The power LED indicates that the AC c
8. cuits In the unlikely event that a problem occurs the amplifier shuts itself off When conditions return to nor mal regular operation resumes Status Display for Troubleshooting LEDs on the front panel indicate Power Active Status and a Protection Warning With a glance at the front panel a troubleshooter is quickly provided with key infor mation Control Output A 12Volt DC output is provided whenever the amplifier is on allowing you to operate voltage triggered devices like motorized screens and curtains Designed and Engineered in the USA Limited two year parts and labor warranty mm gt e raz mm N gt Z ev lez mm Z m N Z N gt gt e Z e e Z gt J m wn gt e Z N INSTALLATION CONSIDERATIONS Placement Place the SI 275 on a flat level surface like a table or shelf It should be placed upright so that its weight rests on the four attached feet Placing the weight of the amplifier on the rear or front panel for even an instant will result in damage to the amplifier s connectors and controls The SI 275 like any hi fi component will last much longer if it is given adequate ventilation for proper cooling When installing the SI 275 in a cabinet be sure that the rear of the cabinet is open to fresh air to provide proper cooling see Figure 1 If the cabinet s design will not accommodate an open rear install two small boxer fans to
9. delity and Architecture are registered trademarks of Niles Audio Corporation BusMatrix is a trademark of Niles Audio Corporation DS00219D
10. gives you three options for turning the SI 275 on and off TURN ON MODE AUDIO SENSE CONSTANT 3 30V AC DC TRIGGER INPUT o Constant The auto turn on circuitry is off The front panel master power switch operates the amplifier In is On out is Off Audio Sense The master switch on the front panel must be in the On position The amplifier is off when there is no audio signal present at either the left or the right input but the sensing circuitry is on The turn on sensing circuitry looks for a tiny amount of audio signal present at any of the audio inputs If it detects a signal the amplifier is turned on Once the audio signal stops the sensing circuit waits two minutes then turns the amplifier off 3 30 Volt AC DC Opto lsolated Voltage Trigger The master switch on the front panel must be in the On position The amplifier is off when there is no 3 30V AC or DC voltage detected at the trigger input Once the sensing circuitry detects a voltage the amplifier is turned on Once the voltage stops the sensing circuit instantly turns the amplifier off Voltage triggers can be supplied by Niles automated switchers some video projectors some surround sound processors or something as simple as a 16 volt AC wall adapter plugged into the switched outlet of your stereo receiver DO NOT USE A DC WALL ADAPTER The long discharge time of the DC adapter s filter capacitor will delay the turn off of the ampl
11. ifier If you are using a wall adapter or external power supply to provide the trigger it doesn t have to be very large a minimum current capability of 2 5 milliamps for a 3 volt trigger increasing up to a minimum of 38 milliamps for a 30 volt trigger Z Q gt m gt 9 zZ O e zZ A J m ra gt e Z N Z N gt m m gt e zZ e e zZ J m a gt 9 zZ N Multiple Speaker Loads The SI 275 is stable into very low impedance loads This means you can safely operate three pairs of 8 ohm speakers a 2 67 ohm load directly connected to the SI 275 Note that the SI 275 does not have on off speaker switching built in When the amplifier is on so are all of the speakers Niles makes a number of different speaker selection and impedance matching sys tems Speaker selection systems allow each pair of speakers to be turned on and off from your equipment location or even via remote control That way you know that the speakers in the bedroom are off so you can avoid waking a sleeping spouse These speaker selectors provide an easy way to terminate all of the wires for more than three pairs Testing and troubleshooting a new system is much easier with the individual room labels and on off switches of a Niles speaker selection system Additionally Niles speaker selection systems offer impedance matching features which will allow you to connect up to ten pairs of speakers to your SI
12. ill not turn on AC power cord must be plugged into a working out let Master power switch must be on Bass sound is weak and the stereo image is phasey or blurry sounding in one room The loudspeakers are wired out of phase Reverse the connections at the back of one speaker SPECIFICATIONS Design Principle Linear voltage current amplification Continuous Average Power Output 75 watts per channel RMS at 8 ohms both channels driven 120 watts per channel RMS at 4 ohms both channels driven Input Impedance Approximately 15K ohms Input Sensitivity 920V for 8 ohm rated power 810V for 4 ohm rated power Overall Voltage Gain 28 5 dB Frequency Response Bandwidth from 10 Hz to 70 kHz 1 dB Signal to Noise Ratio gt 115 dB A weighted Total Harmonic Distortion 8 ohms 02 THD from 20 Hz to 10 kHz full rated power 4 ohms 02 THD from 20 Hz to 10 kHz full rated power Overall Dimensions 17 wide 4 high including feet 13 1 8 deep Weight 21 Ibs n m Q an gt e Z wn NILESe Niles Audio Corporation 12331 S W 130 Street Miami Florida 33186 Tel 305 238 4373 Fax 305 238 0185 www nilesaudio com 2000 2009 Niles Audio Corporation Because Niles strives to continuously improve itsproducts Niles reserves the right to change product specifications with out notice Niles the Niles logo Systems Integration Amplifier and Blending High Fi
13. ng posts accept dual banana or single banana connectors TECH TIP Wire size is expressed by its AWG American CA Wire Gauge number The lower the number the larger the wire i e twelve AWG is physically larger than fourteen AWG Z ez gt gt e Z a e Z J m wn gt e Z N Red Power LED confirms the amplifier is connected to a live AC power outlet and that the master power switch is on Green Active LED lights when the amplifier circuitry has been turned on by the Turn On circuits SE SYSTEMS INTEGRATION AMPLIFIER POWER active PROTECT LO LEVEL ADJUST Cr 7 7 e zZ 2 gt Z e Aw m gt 7 az 2 gt yA m m J m gt m N Front panel Master Power switch turns off the entire amplifier including the Turn On circuitry Main Inputs enable you to route a stereo line level source to the SI 275 The red Protect LED indicates the amp has shut down because there is a fault in the speaker the wiring or with the SI 275 itself Cascade Outputs of the main input enable you to daisy chain multiple amplifiers Turn On Mode switch ka 3 5 mm mini jack for voltage input MODEL SI 275 TURN ON MODE INSIDE REFER SERVICI MAIN CASCADE INPUT OUTPUT AUDIO SENSE CONSTANT 330 AC DC TRIGGER INPUT LEFT 12V CONTROL OUT
14. off the 12 Volt signal is off Using the 3 5 mm jack STEP DESCRIPTION 1 Check the requirements of the The control output has a maximum device you want to control current capability of 12V DC 150 mA 2 Connect the 3 5 mm Jack to the Niles makes an accessory cable control output maintaining proper plug FG00933 polarity tip Speaker Wire Connections CAUTION ALL SPEAKER WIRE CONNECTIONS MUST BE MADE WITH THE AMPLIFIER OFF Bare Wire Unscrew the red or black plastic knob insert the bare wire end into the opening and then tighten the knob until the wire is Banana Plugs There are many types of banana plugs some crimp some solder The Niles gold banana plug has a quick con nect binding post for Z N gt m gt e zZ the bare wire on the body of the plug A banana plug is sim ply inserted into the jack at the end of the amplifier s binding post Dual banana plugs will fit the SI 275 binding posts securely clamped STEP 1 Label all wires If you label the wires for their destination rather than which terminal of the SI 275 they are connected to it will be easier to reconfigure your system in the future 2 Connect one stripped wire end or A Split the speaker wire insulation so that banana plug to the black terminal and one to the red terminal CAUTION AVOID EVEN A SINGLE STRAND OF WIRE TOUCHING THE CHASSIS OR ANOTHER CONNECTOR at least
15. ord is plugged into a working AC power receptacle and that the power switch is in the On position Active LED The rear panel turn on mode switch determines when and how the amplifier will turn on The Active LED indicates that the amplifier is operating Protection LED The front panel protection LED indicates that the amplifier has been shut down because of either a fault in the wiring or the speaker or with the SI 275 itself Level Adjustment Screws The front panel level adjustment screws allow you to adjust the level of the SI 275 relative to other amplifiers in your system Use a 1 8 slotted screwdriver to adjust the screws If the SI 275 is the only amplifier in your system leave the screws at their factory default position Cleaning and Maintenance The internal parts of the SI 275 are electronic and require no maintenance Once a year it is appropriate to twist the RCA connectors on each input to remove cor rosion and improve conductivity You can clean the amplifier with soft cloth or paper towel dampened with water or a mild detergent Do not use any spray type abrasive cleaners on the amplifier TROUBLESHOOTING GUIDE When there is a problem consult this guide first If the problem persists or you have additional questions call your local Niles dealer or Niles Technical Support at 1 800 289 4434 The most common problems relate to hook up Call from your telephone extension nearest the system SYMPTOM
16. provide continuous air flow into and out of the cabinet see Figure 2 Place the SI 275 so that there is at least 7 of free air space above the chassis If the ampli fier is located on a carpeted surface place a board under the amplifier s feet Do not block the ventilation holes on the top and bottom of the SI 275 CAUTION When using low impedance speaker loads less than 8 ohms Normal Mode refer to Figure 2 for proper placement Figure 1 Figure 2 Boxer Fan 55 CFM Boxer Fan 55 CFM directly centered 7 directly centered 2 on top of the SI 275 behind the SI 275 ZZZZZZZZZXJJJJJQZQ JJZQ ZQZ QZ QZ Goo aXAKXW WdWwWwEZWWXIII I IZ Make sure that there is a minimum of 7 of free air space above the amplifier for proper ventilation ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZA j E If the cabinet rear is not open to fresh air or if you re using low impedance loads install two boxer fans Allow a minimum of 5 of depth behind unit 55 CFM to provide continuous air flow into and out to accommodate cables and connectors of the cabinet Turn On Modes The SI 275 draws more current than a preamplifier s switched AC outlet can safely supply Also your preamplifier may thump at dangerous volumes if the amplifier is already on when the preamp turns on It is usually best to turn the amplifier on only when it is needed The Turn On Mode selector switch
17. rom Crosstalk Each channel of the SI 275 is powered via its own independent power supply This increases the isolation between the two channels and eliminates cross talk guaran teeing you absolute silence as the backdrop to your music Current for Reactive Loads The high current design of the SI 275 assures that even unusual and reactive loads are handled with ease A massive toroidal transformer with two separate windings for each of the power supplies provides more than ample current to your system Freedom from Fan Noise The oversized heat sinks inside the SI 275 allow the amplifier to stay cool even when operating into low impedance loads without the noise of fan cooled amplifiers Independent Level Controls Each channel has its own independent level control enabling you to precisely match the SI 275 to the rest of your system The level controls also enable you to limit the volume preventing abuse of the system Lifetime Connections The SI 275 features gold plated stereo inputs cascade stereo outputs and five way binding posts to ensure perfect connections without corrosion for years to come Turn On Modes The SI 275 features three turn on modes 1 Music Sense 2 External Voltage Trigger 3 Manual Turn On via the front panel switch You can configure the SI 275 to interface with any kind of system and have the unit automatically turn on Automatic Protection The SI 275 is equipped with sophisticated protection cir
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