Niles Audio SI-2125 User Manual 2
INSTALLATION & OPERATION GUIDE
Systems Integration Amplifier
230 Volts 50Hz Export Version
®
B l e n d i n g Hi g H Fid e li t y a n d ar c H i t e c t u r e
®
®
CONGRATULATIONS!
Thank you for purchasing the Niles SI-2125, one of the most flexible and
convenient amplifiers ever offered. Like all Niles products, the SI-2125 is built to
the highest standards of quality control and reliability. With proper installation
and operation, you’ll enjoy years of trouble-free use.
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
The lightning flash with arrowhead symbol, within an
CAUTION
CAUTION: TO REDUCE
THE RISK OF ELECTRICAL
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.
SHOCK, DO NOT REMOVE
COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER
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
The exclamation point within an equivalent triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the appliance.
1
INTRODUCTION
The SI-2125 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, outdoor speakers and background music.
The SI-2125 brings extremely high- current power to a custom installed A/V
system in a remarkably convenient way.
INTRODUCTION
SI-2125
Systems Integration
Stereo Power Amplifier
230 Volts 50Hz Export Version
2
FEATURES AND BENEFITS
FEATURES AND BENEFITS
Real World Power
The SI-2125 delivers 125 watts per channel at 8 ohms, 200 watts per channel at
4 ohms and 300 watts bridged at 8 ohms. You’ll get tremendous bass and dynamics
from every pair of speakers powered by an SI-2125.
Transparent Sound
The audio circuitry of the SI-2125 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-2125 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-2125 assures that even unusual and reactive loads
are handled with ease. A massive toroidal transformer with two separate windings for
each of the power supplies provides more than ample current to your system.
Freedom from Fan Noise
The oversized heat sinks inside the SI-2125 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-2125 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-2125 features gold plated stereo inputs, cascade stereo outputs, and five way
binding posts to ensure perfect connections without corrosion for years to come.
3
Turn-On Modes
The SI-2125 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-2125 to interface with any kind of system and have the unit automatically turn
on.
Automatic Protection
The SI-2125 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
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.
FEATURES AND BENEFITS
Bridged Mode
The SI-2125’s can be operated in a bridged mono configuration. In this
configuration, it can deliver upwards of 300 watts. Bridged mode is perfect for
subwoofer, rock speakers or any applications requiring high power output.
Designed and Engineered in the USA
Limited two-year parts and labor warranty.
4
INSTALLATION CONSIDERATIONS
INSTALLATION CONSIDERATIONS
Placement
Place the SI-2125 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-2125, like any hi-fi component, will last much longer if it is given adequate
ventilation for proper cooling. When installing the SI-2125 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-2125 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-2125.
CAUTION! When using low impedance speaker loads (less than 8 ohms Normal
Mode) refer to figure 2 for proper placement.
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 2” of depth behind unit
to accommodate cables and connectors.
Boxer Fan (55 CFM)
directly centered 7”
on top of the SI-2125.
If the cabinet rear is not open to fresh air or if you’re using
low impedance loads, install two “boxer fans” to provide
continuous air flow into and out of the cabinet.
Figure 2
Boxer Fan (55 CFM)
directly centered 2”
behind the SI-2125.
5
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