Niles SI-275 Export Original Betriebsanleitung

INSTALLATION & OPERATION GUIDE

BLENDING HIGH FIDELITY AND ARCHITECTURE

Systems Integration Ampliﬁer

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.

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

CAUTION: TO REDUCE

THE RISK OF ELECTRICAL

SHOCK, DO NOTREMOVE

COVER. NO USER-SERVICE-

ABLE PARTS INSIDE. REFER

SERVICING TO QUALIFIED

SERVICE PERSONNEL.

CAUTION

The lightning flash with arrowhead symbol, within an

equilateral triangle, is intended to alert the user to the

presence of uninsulated dangerous voltage within the

product’s enclosure that may be of sufficient magnitude

to constitute a risk of electric shock to persons.

The exclamation point within an equivalent triangle is

intended to alert the user to the presence of important

operating and maintnance (servicing) instructions in the

literature accompaying the appliance.

CAUTION: TO PREVENT ELECTRICAL SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, FULLY INSERT

ATTENTION: POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE LAME LA PLUS LARGE DE LA FICHE

DANS LA BOURNE CORRESONDANTE DE LA PRISE ET POUSSER JUSQU’AU FOND

WARNING:TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR

MOISTURE

DS00219CMY-SI-275.qxp 6/7/05 3:18 PM Page 1

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 environments in different rooms, and different kinds of applications;

home theater, stereo, and background music. The SI-275 brings extremely high-

current power to a custom installed A/V System in a remarkably convenient way.

INTRODUCTION

SI-275

Systems Integration

Stereo Power Amplifier

DS00219CMY-SI-275.qxp 6/7/05 3:18 PM Page 2

FEATURES AND BENEFITS

Real World Power

The SI-275 delivers 75 watts per channel at 8 Ohms and 100 watts per channel at

4Ohms. You’ll get tremendous bass and dynamics from every pair of speakers

Transparent Sound

The audio circuitry of the SI-275 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-275 is powered via its own independent power supply. This

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

teeing you absolute silence as the backdrop to your music.

Current For Reactive Loads

The high current design of the SI-275 assures that even unusual and reactive loads are

handled with aplomb. A massive toroidal transformer with two separate windings for

each of the power supplies supplies more than ample current to your system.

Freedom from Fan Noise

The oversized heat sinks inside the SI-275 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-275 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-275 features gold plated stereo inputs, the cascade stereo outputs as well as the

five way binding posts are gold plated to ensure perfect connections without corrosion

for years to come.

FEATURES AND BENEFITS

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Turn-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 Protection

The SI-275 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

LEDs on the front panel indicate Power, Active Status, and a Protection Warning. With

aglance at the front panel, a troubleshooter is quickly provided with key information!

Control Output

A12Volt 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

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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.

The SI-275, like any hi-fi component, will last much longer if it is given adequate

ventilation for proper cooling. When installing the SI-275 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-275 so that there is at least 7" of free air space above the chassis. If the ampli-

fier 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-275.

CAUTION! When using low impedance speaker loads (less than 8 ohms Normal

Mode) refer to Figure 2 for proper placement.

The SI-275 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-275.

INSTALLATION CONSIDERATIONS

Make sure that there is a minimum of 7" of free air

space above the amplifier for proper ventilation.

Allow a minimum of 5" of depth behind unit

to accommodate cables and connectors.

If the cabinet rear is not open to fresh air or if you’re using

low impedance loads, install two “boxer fans” (55cfm fan)

to provide continuous air flow into and out of the cabinet.

Boxer Fan (55 CFM)

directly centered 2"

behind the SI-275.

Boxer Fan (55 CFM)

directly centered 7"

on top of the SI-275.

Figure 1 Figure 2

DS00219CMY-SI-275.qxp 6/7/05 3:18 PM Page 5

Turn-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 options for turning the SI-275 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

atiny 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 two 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 voltage detected at the trigger input. Once the sensing circuitry detects a volt-

age, 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 switch-

ers, some video projectors, some surround sound processors, or something as sim-

ple 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

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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 amplifier placement, see Installation Considerations on page 5, Figure 2).

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 speak-

ers 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-275 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, I nc.

Miami, Florida USA

NILES

Niles SI-275

Niles HPS-6 Speaker Selection System

Speaker selection systems alloweachpair of speakers to be turned on and off from your

equipment location (or even via remote control).

DS00219CMY-SI-275.qxp 6/7/05 3:18 PM Page 7

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-275 they are connected to.

The SI-275 connects to your sources via shielded line level audio cables with

RCA phono plugs. Use high quality cables with your Niles amplifier for the low-

est possible noise and best overall performance. Your Niles dealer can recom-

mend the proper cable.

The SI-275 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-275 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.

TECHTIP

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.

DS00219CMY-SI-275.qxp 6/7/05 3:18 PM Page 8

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 the speaker, the

wiring, or with the SI-275 itself.

Main Inputs enable you to route a stereo

line level source to the SI-275.

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

3.5 Mini Plug socket

for voltage input.

FRONT AND REAR PANEL DETAILS

DS00219CMY-SI-275.qxp 6/7/05 3:18 PM Page 9

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