Niles SI-245 Owners manual
INSTALLATION & OPERATION GUIDE
Systems Integration Amplifier
®
®
B LENDING H IGH F IDELITY AND A RCHITECTURE
®
CONGRATULATIONS!
Thank you for purchasing the Niles SI-245, one of the most flexible and convenient 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 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 maintenance (servicing) instructions in the
literature accompanying the appliance.
1
SPECIFICATIONS
Design Principle
Linear voltage/current amplification.
Continuous Average Power Output
45 watts per channel RMS at 8 ohms.
70 watts per channel RMS at 4 ohms.
Input Impedance
Approximately 15K ohms
Input Sensitivity
.77V for 8Ω rated output
Overall Voltage Gain
28 dB
Frequency Response
Bandwidth Limited from 10 Hz to 100 kHz
Total Harmonic Distortion
8 Ohms
.05% THD from 20 Hz to 20 kHz @ full rated power
4 Ohms
.06% THD from 20 Hz to 20 kHz @ full rated power
SPECIFICATIONS
Overall Dimensions
17" wide 2-5/16" high (including feet) 13-1/8" deep
Weight
15 lbs
18
FEATURES AND BENEFITS
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
powered by an SI-245.
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 guaranteeing 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.
3
TROUBLESHOOTING GUIDE
When there is a problem consult this guide first. If the problem persists, or you
have additional questions, call your local Niles dealer or Niles Technical Support
at 1-800-289-4434. The most common problems relate to hook up. Call from
your telephone extension nearest the system.
TROUBLESHOOTING GUIDE
SYMPTOM
No sound on one channel
No sound on both channels
Hum from the speakers
POSSIBLE CAUSES AND TEST PROCEDURE
Short circuit or loose wire at the speaker or amplifier terminals. Check that the connections are secure
and that there are no loose strands of wire crossing
from the positive to the negative terminals at the
back of the amplifier and /or the speaker.
Short circuit or a break in the speaker wire. Disconnect the speaker wire at both ends, separate the
2 conductors at both ends and test with a meter for
a short circuit. If there is no short, connect the two
conductors at one end and test with a meter for
continuity.
Speaker is not working. Connect the speaker to a
channel that plays another speaker.
Audio cable to input is bad. Connect another cable
that is known to be good.
Audio cable to the main inputs is bad. Connect
another cable that is known to be good.
Hum may be caused by a ground loop between
two of the other components in the system. To test
for another ground loop, try reversing the AC plugs
of each of the components in the system.
16
INSTALLATION CONSIDERATIONS
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.
CAUTION! When using low impedance speaker loads (less than 8 ohms Normal
Mode) refer to Figure 2 for proper placement.
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.
Figure 1
If the cabinet rear is not open to fresh
air, install two small “boxer fans”
(55cfm fan) 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 5" of depth
behind unit to accommodate
cables and connectors.
Figure 2
5
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