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Table of contents for the manual
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B lending H igH F idelity and a rcHitectur e ® Systems Integration Ampli f ie r ® ® INSTALLATION & OPERATION GUIDE[...]
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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 IN TRODUCTION 2 F[...]
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INTRODUCTION The SI-275 is a member of the award-winning Niles Systems Integration Amplifier family . It is designed for home theate rs and whole house audio systems requiri ng high power. Niles specifically created Systems Integration Amplifiers to solve the problems of interfacing with different brands and models of equipment, different acoustic [...]
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FEATURES AND BENEFITS Real World Power The SI-275 delivers 75 watts per channel at 8 ohms and 1 20 watts per channel at 4 ohms. You’ll get tremendous bass and dynamics from every pair of speakers po wer ed by an SI- 275. Transparent Sound The audio circuitry of the SI-275 is constructed using the finest parts available; including 1% metal film re[...]
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Turn-On Modes Th e SI -2 75 f ea tur es thr ee tur n- on m od es: 1. Mus ic Sen se , 2. Ex ter na l Vo lt age Tr igg er , 3. M an ual Tur n-O n vi a th e fr on t pa nel swi tc h. Yo u ca n co nf ig ure 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 sophistica[...]
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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 [...]
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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 gives you three options f[...]
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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 [...]
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INSTALLATION CONSIDERATIONS 8 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. Us[...]
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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. Front panel “Master Power” switch turns off the entire amplifier, including the Turn-On circuitry. The red “ P rotect?[...]
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Binding posts for speaker connections. IEC receptacle for AC power cord. NOTE: AC receptacle must be easily accessible. FRONT AND REAR PANEL DETAILS 10 Level Adjustment screws enable you to preset the maximum system volume (or match levels with another amplifier).[...]
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INSTALLATION 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. Control Output This terminal provides a 1 2V DC signal suitable for triggering Niles automated switchers, some moto[...]
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12 INSTALLATION 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 securely clamped. Banana Plugs There are many types of banan a plugs , some crimp, some solder. Th[...]
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Line Level Audio Input CAUTION! THE AMPLIFIER MUST BE OFF WHENEVER YOU MAKE CHANGES TO THE INPUT CONNECTIONS. 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 pa[...]
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14 INSTALLATION AC Power Plug STEP Plug the female IEC socket of the sup - pli ed AC cord in to the IEC rec ep tac le on the rear of the amplifier. Plug the two-prong plug into a correctly grounded 120V 60 Hz wall outlet. CAUTION! Typically the preamp/ rece ive r’s swi tch ed outl et is not rated for a power amplifier. DESCRIPTION Just like a com[...]
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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[...]
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16 TROUBLESHOOTING GUIDE 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 No sound on[...]
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17 TROUBLESHOOTING GUIDE (continued) SYMPTOM Hum from the speakers Amp will not turn on Bass sound is weak and the stereo image is “phasey” or “blurry” sounding in one room POSSIBLE CAUSES AND TEST PROCEDURE Che ck for faul ty cabl es, fa ult y so urc e mate ria l, an ungrounded phono system or a defective component. AC power cord must be p[...]
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SPECIFICATIONS 18 SPECIFICATIONS Design Principle Linear voltage/current amplification. Continuous Average Power Output 75 watts per channel RMS at 8 ohms, both channels driven 1 20 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 O[...]
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N I L E S Niles Audio Corporation 1 23 3 1 S . W . 1 30 Str eet M iam i , Florida 33 1 86 T el: (305) 238-4 3 73 Fax: (305) 238- 01 85 www.nilesaudio.com © 2000-2 009 Nile s Audio Corp orat ion . Becaus e Niles striv es to cont inu ous ly improve its products, Niles reserves the right to change product specications with - out notice. Niles, the[...]