Niles SI-275 manual

INST ALLA TION & OPERA TION GUIDE B LENDING H IGH F IDELITY AND A RCHITECTURE ® Systems Integration Amplifi er ® ®[...]

CONGRA TULA TIONS! 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. Wi th p ro pe r in st al la ti on a nd operation, you'll enjoy years of trouble-free use. Niles manufactures t[...]

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 env[...]

FEA TURES AND BENEFITS Real W orld Power The SI-275 delivers 75 watts per channel at 8 Ohms and 1 00 watts per channel at 4 Ohms. You’ll get tremendous bass and dynamics from every pair of speakers powered by an SI-275. T ranspar ent Sound The audio circuitry of the SI-275 is constructed using the finest parts available; including 1% metal film r[...]

T urn-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 Pr otection The SI-275 is equipped with sophisticated protection circuits. In the unli[...]

INST ALLA TION CONSIDERA TIONS 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,[...]

T urn-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 it is needed. The Turn-On Mode selector switch gives you three option[...]

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. (for more information on proper amp[...]

INST ALLA TION CONSIDERA TIONS 8 Cable and W ire 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[...]

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 “Protect?[...]

Binding posts for speaker connections. IEC receptacle for AC power cord. NOTE: AC receptacle must be easily accessible. FRONT AND REAR P ANEL DET AILS 10 ut a e Level Adjustment screws enable you to preset the maximum system volume (or match levels with another amplifier). DS00219CMY-SI-275.qxp 6/7/05 3:18 PM Page 10[...]

INST ALLA TION Setting the T urn- 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. Contr ol Output This terminal provides a 1 2V DC signal suitable for triggering Niles automated switchers, some [...]

12 INST ALLA TION Speaker W ire Connections C A UTION! All speaker wire connections must be made with the amplifier Off. Bare W ire 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 banana plugs, some crimp, some solder[...]

Line Level Audio Input C A UTION! THE AMPLIFIER MUST BE OFF WHENEVER Y OU MAKE CHANGES T O 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 audi[...]

14 INST ALLA TION AC Power Plug STEP Plug the female IEC socket of the sup- plied AC cord into the IEC r eceptacle on the rear of the amplifier . Plug the 2 prong plug into a corr ectly gr ounded 1 20V 60 Hz wall outlet. CAUTION! T ypically the preamp/r eceiver’ s switched outlet is not rated for a power amplifier . DESCRIPTION Just like a comput[...]

OPERA TION 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 butto[...]

16 TROUBLESHOO TING GUIDE TROUBLESHOO TING 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. SYMPT OM No sound [...]

17 TROUBLESHOO TING GUIDE (continued) SYMPT OM Hum from the speakers Amp will not turn on Bass sound is weak and the stereo image is “phasey” or “blurry” sounding in one r oom POSSIBLE CA USES AND TEST PROCEDURE Check for faulty cables, faulty source material, an ungrounded phono system or a defective component. AC power cord must be plugge[...]

SPECIFIC A TIONS 18 SPECIFIC A TIONS Design Principle Linear voltage/current amplification. Continuous Average Power Output 75 watts per channel RMS at 8 ohms. 1 00 watts per channel RMS at 4 ohms. Input Impedance Approximately 15K ohms Input Sensitivity .985V for 8Ω rated output Overall V oltage Gain 30 dB Frequency Response Bandwidth Limited fr[...]

Niles Audio Corporation www .nilesaudio.com 1 23 3 1 S. W . 1 30 Street Miami, Florida 3 3 1 86 T el: (305) 238-43 73 Fax: (305) 238-0 1 85 © 2005 Niles A udio Corporation. All rights reser ved. Niles, the Niles logos , Sy stems Int egr ation Amplifier and Blending High Fidelity and Archit ecture ar e register ed trade- mar ks of Niles Audio Co r [...]