Instruction/ maintenance manual of the product SI-275 Niles Audio
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B lending H igH F idelity and a rcHitectur e ® Systems Integration Ampli f ie r ® ® INSTALLATION & 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.
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.
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.
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.
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.
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.
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.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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.
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 .
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.
An important point after buying a device Niles Audio SI-275 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Niles Audio SI-275 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Niles Audio SI-275 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Niles Audio SI-275 you will learn all the available features of the product, as well as information on its operation. The information that you get Niles Audio SI-275 will certainly help you make a decision on the purchase.
If you already are a holder of Niles Audio SI-275, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Niles Audio SI-275.
However, one of the most important roles played by the user manual is to help in solving problems with Niles Audio SI-275. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Niles Audio SI-275 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
