Niles Audio SI-275 Home Theater System User Manual
Contents
1. of 5 of free air space above the A amplifier for proper ventilation p 7 G A Yi LLL g 7 7 LLL LLLLLLL Yj j G A e e E g eT bl z LZ ETTU y f JF Allow a minimum of 2 of 7 A depth behind unit to accom p z eo 7 modate cables and connectors PZZ Turn On Modes The SI 275 draws more current than a preamplifier s switched AC outlet can safe ly 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 itis needed The Turn O n M ode selector switch gives you three options for turning the SI 275 on and off TURN ON MODE AUDIO SENSE CONSTANT 3 30V AC DC TRIGGER E Constant The auto turn on circuitry is off The front panel master power switch operates the amplifier In is On outis O ff 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 sig nal 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 O pto Isolated Voltage Trigger The master switch on the front panel must be in the On positio2. Cc i o gt Z 0 er m r4 m a a FEATURES AND BENEFITS Real World Power The Sl 275 delivers 75 watts per channel at 8 Ohms and 100 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 Sl 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 From 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 aplomb A massive toroidal transformer with two separate windings for each of the power supplies supplies 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
3. you to limit the volume preventing abuse of the system Lifetime Connections The Sl 275 features gold plated stereo inputs the cascade stereo outputs as well as the five way binding posts are gold plated to ensure perfect connections without corrosion for years to come Turn On Modes The Sl 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 circuits 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 LED s 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 information Control Output A 12 volt 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 i Cc fa o D Z 0 e m Z m a a s J e 2 A e Z v 0 J e Z m INSTALLATION CONSIDERATIONS Placement Place the SI 275 on a flat level surface like a table or shelf It should be placed upright so th
4. BLE 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 x c ie w m f O O J z Q 0 m 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 No sound on both channels Audio cable to the main inputs is bad Connect another cable that is known to be good Hum from the speakers Hum may be caused by a ground loop between two of the other components in the system To test for another ground loop try reversing the AC plugs of each of the components in the system x c ie w m f O O J Z a Q 0 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 will not turn on AC power cord must be plugged i
5. INSTALLATION amp OPERATION GUIDE 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 Niles manufactures the industry s most complete line of custom installation compo nents and accessories for audio video systems For a free full line catalog write Niles Catalog Request PO Box 160818 Miami Florida 33116 0818 TABLE OF CONTENTS INTRODUCTION 2 FEATURES AND BENEFITS 3 INSTALLATION CONSIDERATIONS 5 INSTALLATION 11 FRONT AND REAR PANEL DETAILS 9 O PERATIO N 15 TROUBLESHOOTING GUIDE 16 SPECIFICATIONS 18 INTRODUCTION The SI 275 is a member of the award winning N iles 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 Z m O S 0 e Z i
6. ach of its six 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 ADA 6 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 2 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 tum on circuit instead Z 3 fe Z N OLLWudad O 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 cir cuitry 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 Power LED The power LED indicates that the AC cord is plugged
7. at 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 provide continuous air flow into and out of the cabinet see Figure 2 Place the SI 275 so that there is at least 5 of free air space above the chassis If the amplifier 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 SIl 275 The SI 275 is equipped with an internal transformer which generates a powerful magnetic field which could induce hum in a turntable particularly a turntable equipped with a moving coil cartridge Do not place a turntable directly above or directly adjacent to the SI 275 Figure 1 Figure 2 If the cabinet rear is not open to fresh air install two small boxer fans to provide continuous air flow into and out of the cabinet Make sure that there is a minimum YZAL LLLLRLLARLRARALA RA a
8. d switchers some motorized screens some electric curtain controls etc The trigger voltage is present yc only when the amplifier is active or on y When the amplifier turns off the 12 volt sig nal is off This terminal provides a 12v DC signal suit out Using the ol j TR 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 12vDC 150 mA 2 Connect the 3 5mm J ack to the Niles makes an accessory cable control output maintaining proper plug FG00724 polarity tip Speaker Wire Connections CAUTION All speaker wire connections must be made with the amplifier O ff Bare Wire Unscrew the red or black plastic knob insert the bare wire end into the opening and then tighten the Banana Plugs There are many types of banana plugs some crimp some solder The Niles gold banana plug has a quick con Z 3 fe Z knob until the wire is securely clamped nect binding post for the bare wire on the body of the plug A banana plug is simply inserted into the jack atthe end of the ampli fiers binding post Dual banana plugs will fit the SI 275 bind ing posts STEP DESCRIPTION 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 recon figure your system in the future 2 Connect one str
9. down because there is a fault in the speaker the wiring or with the SI 275 itself Cascade O utputs of the main input enable you to daisy chain multiple amplifiers MODEL I 275 3 5 Mini Plug socket for voltage input TURN ON MODE CDC TRIGGER 12V CONTROL OUT AZ CASCADE OUTPUT i LEFT O OK 3 5mm Mini Plug socket for 12v DC Control output M NILES Level Adjustment screws enable you to preset the maximum system volume or match levels with another amplifier R NILES CAUTION TO REDUCE THE RISK OF ELECTRICAL SHOCK De SERIAL NUMBER Binding posts for speaker connections IEC receptacle for AC power cord D fe Zz gt Z 0 Pe p A 3 2 m m i 2 h NOLLVTIVISNI INSTALLATION 9 Setting The Turn On Mode Switch 13 Cascade Audio Outputs 9 Control Output 14 AC Power plug 10 Speaker Wire Connections 17 Rail Fuse Holders 13 Line Level Audio Inputs 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 l 3 30V AC DC CONSTANT m TRIGGER INPUT Slide the switch with your fingernail or a 1 8 slotted screwdriver blade Control Output able for triggering Niles automate
10. 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 Sl 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 turned fully clockwise Cleaning and Maintenance The internal parts of the SI 275 are electronic and require no maintenance Once a year itis 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 POSSI
11. ipped wire end or A Split the speaker wire insulation so that banana plug to the black terminal at least two inches of each conductor are and one to the red terminal separated B Strip one half inch of insulation from the end of each conductor of the speaker wire CAUTION Avoid even a single strand C Attach banana plugs or twist the strands of of wire touching the chassis or another Wire together and insert them into the appro connector priate binding post NOLLVTIVISNI 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 2 Connect the sources byinserting the Connect outputs from your sources to RCA plugs into the amplifiers jacks inputs on the amplifier Never connect a 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 ADA 6 buffered distribution amplifier A single ADA 6 will allow you to daisy chain 5 amplifiers from e
12. n The amplifier is off when there is no 3 30V AC or DC voltage detected at the trigger input O nce the sensing circuitry detects a volt age 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 switch ers some video projectors some surround sound processors or something as sim ple as a 16 volt AC wall adapter Niles XFO0008 plugged into the switched outlet of your stereo receiver DO NOT USEA DC WALL ADAPTER The long discharge time of the DC adapter s filter capacitor will delay the turn off of the amplifier 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 J fe Z A fe Z v g J fe Z 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 2 5 J O Z A O Z m g J O Z W Niles makes a number of different speaker selection and impedance matching systems Speaker selection systems allow each pair of speakers to be turned on and off from your e
13. nto a working outlet 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 100 watts per channel RMS at 4 ohms Input Impedance 56K ohms Input Sensitivity 985V for 8Q rated output Overall Voltage Gain 30 dB Frequency Response Bandwidth Limited from 10 Hz to 100 kHz Total Harmonic Distortion 8 Ohms 05 THD from 20 Hz to 20 kHz full rated power 4 Ohms 06 THD from 20 Hz to 20 kHz full rated power Overall Dimensions 17 wide 4 high including feet 13 1 8 deep Weight 21 Ibs SNOLLVDHID4dS NILESe Niles Audio Corporation www nilesaudio com 12331 S W 130 Street Miami Florida 33186 Tel 305 238 4373 Fax 305 238 0185 1999 Niles Audio Corporation Because Niles strives to continuously improve its products Niles reserves the right to change product specifications without notice Niles the Niles logo and Blending High Fidelity and Architecture are registered trademarks of Niles Audio Corporation Systems Integration Amplifier and BusMatrix are trademarks of Niles Audio Corporation Printed in the USA 7 98 DS00219B
14. quipment location or even via remote control That way you know that the speak ers in the bedroom are off so you can avoid waking a sleeping spouse These speak er 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 275 amplifier Niles SI 275 Niles HDL 6 Speaker Selection System O loll eO lel eOe eOe eO I e 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 e
15. st possible noise and best overall performance Your Niles dealer can recom mend the proper cable The Sl 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 binding posts accept dual banana or single banana connectors TECH TIP A Wire size is expressed by its AWG American CG Wire Gauge number The lower the number the larger the wire i e twelve AWG is physically larger than fourteen AWG 5 5 5 J ie 2 0 0 Z v 0 e Z T 2 fe Z gt r4 0 Pe p Pel Z m r i z h Red Power LED confirms the amplifier is connected to a live AC power outlet and that the master power switch is on Red Active LED lights when the ampli fier circuitry has been turned on by the Turn O n circuits 5 SYSTEMS INTEGRATION AMPLIFIER POWER ACTIVE protect LC evel apjust C R Front panel Master Power switch turns off the entire amplifier including the Turn O n circuitry Main Inputs enable you to route a stereo line level source to the SI 275 Turn On Mode switch The red Protect LED indicates the amp has shut
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