Niles SPS-4 Istruzioni operative originali
SPS-4
INSTALLATION & OPERATION GUIDE
NILES
®
MODEL
SPS-4
SPEAKER SELECTION SYSTEM
SPS-4
Introduction
The SPS-4 allows you to connect up to four pairs of speakers
to your stereo receiver or amplifier and play any pair, any
combination of pairs, or all pairs simultaneously. You don't
have to worry about overloading your amplifier. The SPS-4
has a protection circuit that keeps your amplifier running
safely, even if you have all four pairs of speakers playing at
the same time.
TABLE OF CONTENTS
Introduction 1
Features and
Benefits 2
Installation
Considerations 4
Installation 9
Operation 11
Specifications 14
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SPS-4
Speaker Selection
System
1
Features and Benefits
The SPS-4 offers a number of improvements over other
speaker selectors:
●Pre-printed Room Labels are included for easy identification
of speaker ON/OFF buttons.
●Isolated left and right channel ground returns make the
SPS-4 compatible with all types of amplifiers.
●Self-cleaning, silver-plated switch contacts assure many
years of trouble-free use.
●Printed circuit board design assures high reliability.
●Spring-loaded push terminal connectors accommodate up
to 14 gauge wire or "pins", making the SPS-4 compatible
with most high definition speaker cables.
●100% tested, electronically and acoustically, for frequency
response, distortion and power handling.
●Only 8 1/2" wide. Match the width of 17" components by
combining with another Niles 1/2-width product.
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TECH
SUPPORT
HOTLINE
If you have
questions regarding
the operation of the
Niles SPS-4, contact
your local Niles
dealer or Niles
Customer Service at
1-800-289-4434.
●May be used with 4, 6, or 8-ohm speaker systems.
●Ideal for both home and commercial sound installations.
●Only a wire stripper is required for installation.
●Power handling: 100 watts/channel continuous music
power.
●Frequency response:Flat(+0dB,-0dB) from 20Hz to20kHz.
●Ten year parts and labor warranty.
●Proudly made in the USA.
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Installation Considerations
SPS-4 Power Handling
The SPS-4 is designed for use with a receiver or amplifier hav-
ing a maximum power output of 100 watts per channel at 8
ohms. Damage caused by the use of a higher-power receiver
or amplifier will void the warranty. Niles speaker selectors
with higher power handling capabilities are available.
Consult your Niles dealer, or receiver/amplifier manufacturer,
if you are uncertain about the power rating of your receiver
or amplifier.
Amplifier Impedance Load
As more pairs of speakers are parallel connected to a receiver
or amplifier, the overall system impedance becomes lower.
For example, if two pairs of 8-ohm speakers are connected
in parallel, the impedance will be 4 ohms; two pairs of
4-ohm speakers in parallel become 2 ohms, and so on.
Most receivers or amplifiers are not rated for use below a 4
ohm load. Most manufacturers do not recommend connect-
ing more than two pairs of speakers without using some
form of impedance correction.
The SPS-4 includes impedance correction circuitry which pro-
tects your receiver or amplifier from low impedance loads.
4
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TOOLS
REQUIRED
• Wire Stripper
The circuitry assures that your receiver or amplifier will see a
safe operating load, even when all four speaker pairs are
playing at the same time.
The actual impedance load the SPS-4 presents to your receiv-
er or amplifier will vary, depending on how many speaker
pairs are playing and the impedance rating of each speaker.
If you have four pairs of 8-ohm speakers playing, the SPS-4
will present a 4.5 ohm impedance load to your
receiver/amplifier. With four pairs of 4-ohm speakers playing,
the load drops to slightly under 4 ohms.
If you intend to use the SPS-4 with more than 2 pairs of
4-ohm speakers, it is recommended that you verify that the
receiver or amplifier is capable of driving a 4-ohm load.
Consult your Niles dealer, or receiver/amplifier manufacturer,
if you are uncertain about the capabilities of the
receiver/amplifier.
Type of Speaker Wire
For most applications, we recommend you use 16 or 18
gauge, stranded copper speaker wire for the SPS-4 connec-
tions. For wiring runs longer than 80 feet, 14 gauge wire is
recommended. Using speaker wire larger than 14 gauge for
the SPS-4 connections is not recommended—the wire may
not fit into the connectors. Never use solid-core, aluminum,
or "Romex" type wire with the SPS-4. When running speaker
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"TECH TIP"
Wire size is
expressed by it's
AWG (American
Wire Gauge)
number. The lower
the AWG number,
the larger the wire,
i.e., 12 AWG wire is
physically larger
than 14 AWG.
wires inside walls, most states and municipalities in the U.S.
specify that you must use a special type of speaker wire.
Usually, the requirement is that the wire has a specific "CL"
fire rating, such as "CL-2" or "CL-3". Consult your Niles deal-
er, building contractor, or local building and inspection
department if unsure about which type of wire is best for
your application.
Avoiding Interference
Speaker wires can act as an "antenna" for electrical noise.
Locating speaker wires too close to a light dimmer or switch
may cause a "buzzing" or "popping" sound to be heard
through the speakers. If you must locate the SPS-4 wiring
near electrical devices, route the speaker wires several feet
away from the electrical wiring.
Using the SPS-4 with Tube-Type Amplifiers
Virtually all tube amplifiers must have a load connected at all
times. If the amplifier to be connected to the SPS-4 is a tube
amplifier, be sure to always have at least one pair of speakers
switched on at all times. An alternative is to permanently
connect a 150 ohm, 5 watt resistor across the tube amplifier's
output in parallel with the SPS-4. See (Figure 1) on next page
for hookup diagram.
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Figure1
Using a
Tube Amplifier
Tube Amplifier
Niles SPS-4
150 150
SPEAKER 2 SPEAKER 1SPEAKER 3SPEAKER 4
LR
AMPLIFIER
LRLR
++
--
++
--
LRLR
++
--
Niles Audio
Corporation, Inc.
Miami, Florida USA
NILES
8
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SPS-4 SPEAKER SELECTION SYSTEM
PROTECTION
1324
NILES
SPEAKER 2 SPEAKER 1SPEAKER 3SPEAKER 4
LR
AMPLIFIER
LRLR
++
--
++
--
LRLR
++
--
Niles Audio
Corporation, Inc.
Miami, Florida USA
NILES
Recessed
areas for
custom room
labels.
Attractive
low-profile
design.
Simple
push-button
operation.
Connect up to four pairs
of speakers. Protection switch safeguards your
receiver or amplifier even with all
4 pairs of speakers playing.
Spring
loaded push
connectors.
Installation
1. Select a convenient mounting location for the SPS-4.
2. Run all the necessary wiring to the SPS-4. Label the wires
for future reference. See (Figure 2).
9
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TUNER 94.9
15
SPEAKER 2 SPEAKER 1SPEAKER 3SPEAKER 4
LR
AMPLIFIER
LRLR
++
--
++
--
LRLR
++
--
Niles Audio
Corporation, Inc.
Miami, Florida USA
NILES
Niles SPS-4
Receiver
Speaker
Pair 4 Speaker
Pair 3 Speaker
Pair 2 Speaker
Pair 1
Figure2
Wiring Diagram
Indice
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