Niles Audio SI-275 User Manual 2
INSTALLATION & OPERATION GUIDE
Systems Integration Amplifier
®
®
B LENDING H IGH F IDELITY AND A RCHITECTURE
®
CONGRATULATIONS!
Thank you for purchasing the Niles SI-275, one of the most flexible and convenient 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 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
CAUTION
CAUTION: TO REDUCE
THE RISK OF ELECTRICAL
SHOCK, DO NO
COVER. NO USER-SERVICE
ARTS INSIDE. REFER
ABLE P
SERVICING TO QUALIFIED
SERVICE PERSONNEL.
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
REMOVE
T
-
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.
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 highcurrent power to a custom installed A/V System in a remarkably convenient way.
INTRODUCTION
SI-275
Systems Integration
Stereo Power Amplifier
2
FEATURES AND BENEFITS
FEATURES AND BENEFITS
Real World Power
The SI-275 delivers 75 watts per channel at 8 Ohms and 100 watts per channel at
4 Ohms. You’ll get tremendous bass and dynamics from every pair of speakers
powered by an SI-275.
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 guaranteeing 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.
3
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 normal, regular operation resumes.
Status Display for Troubleshooting
LEDs 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!
FEATURES AND BENEFITS
Contr
A 12Volt DC output is provided whenever the amplifier is on, allowing you to
operate voltage-triggered devices like motorized screens and curtains.
ol Output
Designed and Engineered in the USA
Limited two year parts and labor Warranty.
4
INSTALLATION CONSIDERATIONS
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
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 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-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.
Figure 1). If
Figure 1
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.
Boxer Fan (55 CFM)
directly centered 7"
on top of the SI-275.
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.
Figure 2
Boxer Fan (55 CFM)
directly centered 2"
behind the SI-275.
5
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