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Niles SI-245 Installation & Operation Manual

Systems integration amplifier.
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I N S T A L L A T I O N
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O P E R A T I O N
G U I D E
Systems Integration Amplifier
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F
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L E N D I N G
I G H
I D E L I T Y
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R C H I T E C T U R E

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Table of Contents

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  • Page 1 I N S T A L L A T I O N & O P E R A T I O N G U I D E Systems Integration Amplifier ™ ® ™ L E N D I N G I G H I D E L I T Y A N D...
  • Page 2: Table Of Contents

    CONGRATULATIONS! Thank you for purchasing the Niles SI-245, one of the most flexible and conve- nient amplifiers ever offered. Like all Niles products, the SI-245 is built to the highest standards of quality control and reliability. With proper installation and operation, you'll enjoy years of trouble-free use.
  • Page 3: Introduction

    INTRODUCTION The SI-245 is a member of the award-winning Niles Systems Integration Amplifier family. It is designed for use in home theaters and whole house audio systems, and is especially suited for use as a “zone” amplifier. Niles specifically designs...
  • Page 4: Features And Benefits

    FEATURES AND BENEFITS Real World Power The SI-245 delivers 45 watts per channel at 8 Ohms and 70 watts per channel at 4 Ohms. You’ll get tremendous bass and dynamics from every pair of speakers powered by an SI-245. Transparent Sound The audio circuitry of the SI-245 is constructed using the finest parts available;...
  • Page 5 The SI-245 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-245 to inter- face with any kind of system and have the unit automatically turn on.
  • Page 6: Installation Considerations

    “boxer fans” to provide continuous air flow into and out of the cabinet (see Figure 2). Place the SI-245 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.
  • Page 7 Turn-On Modes The SI-245 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.
  • Page 8 Multiple Speaker Loads The SI-245 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-245. Note that the SI-245 does not have on/off speaker switching built in.
  • Page 9 SI-245 they are connected to. The SI-245 connects to your preamp source via shielded line level audio cables with RCA phono plugs. Use high quality cables with your Niles amplifier for the lowest possible noise and best overall performance.
  • Page 10: Front And Rear Panel Details

    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-245. " " Turn-On Mode 3.5mm Mini Plug socket for voltage input.
  • Page 11 Level Adjustment screws enable you to preset the maximum system volume (or match levels with another amplifier). Binding posts for speaker connections. IEC receptacle for AC power cord.
  • Page 12: Installation 1

    13 Line Level Audio Inputs Setting the Turn-On Mode Switch The SI-245 has three turn-on modes. Select the mode you wish to use by sliding the mode switch. See Installation Considerations on page 6 for more information about each of the turn-on modes.
  • Page 13: Speaker Wire Connections

    DESCRIPTION If you label the wires for their destination, rather than which terminal of the SI-245 they are connected to, it will be easier to recon- figure your system in the future. A. Split the speaker wire insulation so that at least two inches of each conductor are separated.
  • Page 14 Niles ADA-6 buffered distribution amplifier. A single ADA-6 will allow you to daisy-chain 5 amplifiers from each of its six outputs, allowing 30 SI-245 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-245.
  • Page 15 DESCRIPTION Just like a computer or printer, the SI-245 has an AC cord which unplugs either at the amp or at the wall for your convenience. If you use a grounded power strip, surge suppressor or extension cord, verify that proper ground is maintained.
  • Page 16: Operation

    Protection LED The front panel protection LED indicates that the amplifier has been shut down because of either a fault in the wiring or a speaker, or with the SI-245 itself. Level Adjustment Screws The front panel level adjustment screws allow you to adjust the level of the SI-245 relative to other amplifiers in your system.
  • Page 17: 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.
  • Page 18 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 Check for faulty cables, faulty source material, an ungrounded phono system or a defective component.
  • Page 19: Specifications

    SPECIFICATIONS Design Principle Linear voltage/current amplification. Continuous Average Power Output 45 watts per channel RMS at 8 ohms. 70 watts per channel RMS at 4 ohms. Input Impedance 22K ohms Input Sensitivity .77V for 8Ω rated output Overall Voltage Gain 28 dB Frequency Response Bandwidth Limited from 10 Hz to 100 kHz...
  • Page 20 ©1998 Niles Audio Corporation. Because Niles strives to continuously improve its products, Niles reserves the right to change product specifications without notice. Niles and the Niles logo are registered trademarks of Niles Audio Corporation. Systems Integration Amplifier and BusMatrix are trademarks of Niles Audio...

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