Niles SI-245 Instructions d'utilisation d'origine

INSTALLATION & OPERATION GUIDE

BLENDING HIGH FIDELITY AND ARCHITECTURE

™

Systems Integration Amplifier™

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.

Niles manufactures the industry's most complete line of custom installation compo-

nents 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

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

Systems Integration Amplifiers to solve the problems installers face when inte-

grating different brands and models of equipment into various acoustic environ-

ments in home theater, stereo, and background music applications. The SI-245

brings extremely high-current power to a custom installed A/V System in a

remarkably convenient way.

INTRODUCTION

SI-245

Systems Integration Amplifier

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

Transparent Sound

The audio circuitry of the SI-245 is 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-245 is powered via its own independent power supply. This

increases the isolation between the two channels, and minimizes cross talk guaran-

teeing you absolute silence as the backdrop to your music.

Current For Reactive Loads

The high current design of the SI-245 assures 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-245 allow the amplifier to stay cool even when

operating into low impedance loads—without the noise of fan-cooled amplifiers.

Independent Level Controls

Each channel has its own independent level control enabling you to precisely

match the SI-245 to the rest of your system. The level controls also enable you to

limit the volume, preventing abuse of the system.

Lifetime Connections

The SI-245 features stereo inputs, cascade stereo outputs, and five-way binding

posts which are all gold plated to ensure perfect connections without corrosion for

years to come.

FEATURES AND BENEFITS

Turn-On Modes

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.

Automatic Protection

The SI-245 is equipped with sophisticated protection circuits. In the unlikely event

that a problem occurs, the amplifier shuts itself off. When conditions return to nor-

mal, 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-triggered devices like motorized screens and curtains.

Designed and Engineered in the USA

Limited two year parts and labor Warranty.

FEATURES AND BENEFITS

INSTALLATION CONSIDERATIONS

Placement

Place the SI-245 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 may result in damage to

the amplifier's connectors and controls.

The SI-245, like any hi-fi component, will last much longer if it is given adequate

ventilation for proper cooling. When installing the SI-245 in a cabinet, be sure

that the rear of the cabinet is open to fresh air to provide proper cooling (see

Figure 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 (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. Do not block the ventilation holes on the top and bottom of the

SI-245.

The SI-245 is 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 the SI-245.

INSTALLATION CONSIDERATIONS

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.

Make sure that there is a minimum

of 5” of free air space above the

amplifier for proper ventilation.

Allow a minimum of 2” of

depth behind unit to accom-

modate cables and connectors.

Figure 1 Figure 2

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. The Turn-On Mode selector switch gives you

three options for turning the SI-245 on and off.

Constant - The auto turn-on circuitry 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. The turn-on sensing circuitry looks for

a tiny amount of audio signal present at any of the audio inputs. If it detects a sig-

nal, the amplifier is turned on. Once the audio signal stops, the sensing circuit

waits three minutes, then turns the amplifier off.

3-30 Volt AC/DC Opto-Isolated Voltage 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 volt-

age detected at the trigger input. Once the sensing circuitry detects a voltage and a line-

level 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).

INSTALLATION CONSIDERATIONS

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.

When the amplifier is on, so are all of the speakers.

Niles makes a number of different speaker selection and impedance matching systems.

Speakerselectionsystemsalloweachpair of speakers tobe turned on andoff from your

equipment location (or even via remote control). That way, you know that the speak-

ers in the bedroom are off so you can avoid waking a sleeping spouse! These speak-

er 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-245 amplifier.

INSTALLATION CONSIDERATIONS

SPEAKER 6

L+ L- R- R+

AMPLIFIER

L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+

SPEAKER 5 SPEAKER 4 SPEAKER 3 SPEAKER 2

L+ L- R- R+

SPEAKER 1

CONSTANT

PROTECTION

ON OFF

Niles Audio

Corporation,Inc.

Miami, Florida USA

NILES

Niles SI-245

Niles HDL-6 Speaker Selection System

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

equipment location.

INSTALLATION CONSIDERATIONS

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-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. Your Niles dealer can rec-

ommend the proper cable.

The SI-245 connects 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 the

SI-245 will 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.

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” LED indicates the amp has shut

down because there is a fault in a speaker, the

wiring, or with the SI-245 itself.

Main Inputs enable you to route a stereo

line level source to the SI-245. Cascade Outputs of the Main Input enable

you to daisy chain multiple amplifiers.

3.5mm Mini Plug socket for

12v DC Control output.

"Turn-On Mode"switch

3.5mm Mini Plug socket

for voltage input.

FRONT AND REAR PANEL DETAILS

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