Niles Audio SI-245 User Manual

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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

®

B L E N D I N GH I G HF I D E L I T Y A N DA R C H I T E C T U R E

CONGRATULATIONS!

Thank you for purchasing the Niles SI-245,one of the most flexible and convenient amplifiers ever offered. Like all Niles products, theSI-245is built to the highest standards of quality control and reliability. With proper installation and operation, you'll enjoy years oftrouble-freeuse.

Niles manufactures the industry's most complete line of custom installation components and accessories for audio/video systems. For a free full line catalog write:

Niles, Catalog Request, P.O. Box 160818, Miami, Florida 33116-0818

TABLE OF CONTENTS

 

INTRODUCTION

2

 

 

 

 

FEATURES AND BENEFITS

3

 

 

 

 

INSTALLATION CONSIDERATIONS

5

 

 

 

 

FRONT AND REAR PANEL DETAILS

9

 

 

 

 

INSTALLATION

11

 

 

 

 

OPERATION

15

 

 

 

 

TROUBLESHOOTING GUIDE

16

 

 

 

 

SPECIFICATIONS

18

 

 

 

 

 

 

1

INTRODUCTION

The SI-245is a member of theaward-winningNiles 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 Systems Integration Amplifiers to solve the problems installers face when integrating different brands and models of equipment into various acoustic environments in home theater, stereo, and background music applications. TheSI-245brings extremelyhigh-currentpower to a custom installed A/V System in a remarkably convenient way.

SI-245

Systems Integration Amplifier

INTRODUCTION

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BENEFITS AND FEATURES

FEATURES AND BENEFITS

Real World Power

The SI-245delivers 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 anSI-245.

Transparent Sound

The audio circuitry of the SI-245is 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-245is powered via its own independent power supply. This increases the isolation between the two channels, and minimizes cross talk guaranteeing you absolute silence as the backdrop to your music.

Current For Reactive Loads

The high current design of the SI-245assures that even unusual and reactive loads are handled with aplomb (a massive toroidal transformer with two separate windings, one for each of the independent power supplies, provides more than ample current to your system).

Freedom from Fan Noise

The oversized heat sinks inside the SI-245allow the amplifier to stay cool even when operating into low impedanceloads—withoutthe noise offan-cooledamplifiers.

Independent Level Controls

Each channel has its own independent level control enabling you to precisely match the SI-245to the rest of your system. The level controls also enable you to limit the volume, preventing abuse of the system.

Lifetime Connections

The SI-245features stereo inputs, cascade stereo outputs, andfive-waybinding posts which are all gold plated to ensure perfect connections without corrosion for years to come.

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Turn-OnModes

The SI-245features threeturn-onmodes: 1. Music Sense 2. External Voltage Trigger 3. ManualTurn-Onvia the front panel switch. You can configure theSI-245to interface with any kind of system and have the unit automatically turn on.

Automatic Protection

The SI-245is equipped with sophisticated protection circuits. In the unlikely event that a problem occurs, the amplifier shuts itself off. When conditions return to normal, 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-triggereddevices like motorized screens and curtains.

Designed and Engineered in the USA

Limited two year parts and labor Warranty.

BENEFITS AND FEATURES

4

CONSIDERATIONS INSTALLATION

INSTALLATION CONSIDERATIONS

Placement

Place the SI-245on 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 may result in damage to the amplifier's connectors and controls.

The SI-245,like anyhi-ficomponent, will last much longer if it is given adequate ventilation for proper cooling. When installing theSI-245in a cabinet, be sure that the rear of the cabinet is open to fresh air to provide proper cooling (seeFigure 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 (seeFigure 2). Place theSI-245so 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 theSI-245.

The SI-245is 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 theSI-245.

Figure 1

Figure 2

Make sure that there is a minimum of 5” of free air space above the amplifier for proper ventilation.

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.

Allow a minimum of 2” of depth behind unit to accommodate cables and connectors.

5

Turn-OnModes

The SI-245draws 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. TheTurn-OnMode selector switch gives you three options for turning theSI-245on and off.

Constant - The autoturn-oncircuitry is off. The front panel master power switch operates the amplifier. In is "On", out is "Off".

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. Theturn-onsensing circuitry looks for a tiny amount of audio signal present at any of the audio inputs. If it detects a signal, the amplifier is turned on. Once the audio signal stops, the sensing circuit waits three minutes, then turns the amplifier off.

3-30Volt AC/DCOpto-IsolatedVoltage Trigger- The master switch on the front panel must be in the "On" position. The amplifier is off when there is no 3-30V AC or DC voltage detected at the trigger input. Once the sensing circuitry detects a voltage and a linelevel audio signal is detected at the input, 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 switchers, some video projectors, some surround sound processors, or something as simple as a 16 volt AC wall adapter (Niles XF00008) plugged into the switched outlet of your stereo receiver. DO NOT USE A 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).

CONSIDERATIONS INSTALLATION

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CONSIDERATIONS INSTALLATION

Multiple Speaker Loads

The SI-245is 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 theSI-245.Note that theSI-245does 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 speaker selection and impedance matching systems. Speaker selection systems allow each pair of speakers to be turned on and off from your equipment location (or even via remote control). That way, you know that the speakers in the bedroom are off so you can avoid waking a sleeping spouse! These speaker 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-245amplifier.

Niles SI-245

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Niles HDL-6Speaker Selection System

 

 

AMPLIFIER

 

 

SPEAKER 6

 

 

SPEAKER 5

 

 

SPEAKER 4

 

 

SPEAKER 3

 

 

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SPEAKER 1

 

 

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L-

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L-

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NILES

ON OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONSTANT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Niles Audio

PROTECTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporation, Inc.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Miami, Florida USA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Speaker selection systems allow each pair of speakers to be turned on and off from your equipment location.

7

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 terminal of the SI-245they are connected to.

The SI-245connects 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. Your Niles dealer can recommend the proper cable.

The SI-245connects 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 theSI-245will 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

Wire size is expressed by its AWG (American Wire Gauge) number. The lower the number, the larger the wire, i.e. twelve AWG is physically larger than fourteen AWG.

CONSIDERATIONS INSTALLATION

8

DETAILS PANEL REAR AND FRONT

Red “Power” LED confirms the amplifier is connected to a live AC power outlet. (and that the master power switch is on).

Front panel “Master Power” switch turns off the entire amplifier, including the Turn-Oncircuitry.

Main Inputs enable you to route a stereo line level source to the SI-245.

"Turn-OnMode" switch

Green “Active” LED lights when the amplifier circuitry has been turned on by the Turn-Oncircuits.

The red “Protect” LED indicates the amp has shut down because there is a fault in a speaker, the wiring, or with the SI-245itself.

Cascade Outputs of the Main Input enable you to daisy chain multiple amplifiers.

3.5mm Mini Plug socket for voltage input.

3.5mm Mini Plug socket for 12v DC Control output.

9