Niles SVL-4 Original operating instructions

SVL-4
INSTALLATION & OPERATION GUIDE
NILES
®
MODEL
SVL-4
SPEAKER SELECTION/VOLUME CONTROL SYSTEM
SVL-4

Introduction
The SVL-4 is a combination speaker selector and volume
controller. It allows you to connect four pairs of speakers to
your stereo receiver or amplifier and adjust the volume of
each pair independently. Additionally, you can choose to
listen to any one pair, any combination of pairs, or all pairs at
once. You don't have to worry about overloading your
amplifier. The SVL-4 has a protection circuit that keeps your
amplifier running safely, even with all four pairs of speakers
playing at the same time.
A perfect application for the SVL-4 is individually controlling
speaker "ON/OFF" and volume adjustment for four pairs of
speakers: one pair in the room with the main stereo system
and three additional pairs in remote locations.
The SVL-4 adjusts the volume of the speakers connected to it
by attenuating the amplifier signal. Niles volume controls use
autoformers instead of L-pads for the volume controlling ele-
ment. This assures minimal internal power dissipation with virtu-
ally no power wasted as heat.
TABLE OF CONTENTS
Introduction 1
Features and
Benefits 2
Installation
Considerations 4
Installation 9
Operation 11
Specifications 14
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
SVL-4
Speaker
Selection/Volume
Control System
1

Features and Benefits
The SVL-4 offers a number of improvements over other
speaker selector/volume controllers:
●The SVL-4 uses 12 position volume controls which are
superior to 10 position designs. You get a broader range
of adjustment—there are 10 steps of attenuation instead
of 8. Steps 11-6 attenuate -3 dB per step; steps 5-2 are 6
dB per step. Step 12 is "full-on" and step 1 is "full-off".
●Greater dynamic range—you get 42 dB of total attenua-
tion instead of the usual 20 or 30 dB.
●POP-FREE switching between all steps.
●Pre-printed Room Labels are included for easy identification
of speaker ON/OFF buttons.
●Isolated left and right channel ground returns make the
SVL-4 compatible with all types of amplifiers.
●Rear panel switch for constant or selectable impedance
protection.
●Self-cleaning, silver-plated switch contacts assure many
years of trouble free use.
2
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
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.

●Printed circuit board design assures high reliability.
●Two-piece removable connectors greatly simplify installa-
tion and hookup. All wiring can be attached directly to the
connectors before installing them in the SVL-4.
●Removable connectors accommodate up to 14 gauge wire
or "pins", making the SVL-4 compatible with most "high-
definition" speaker cables.
●100% tested, electronically and acoustically, for frequency
response, distortion and power handling.
●Standard 17" width allows the SVL-4 to stack neatly with
other standard size components.
●May be used with 4, 6, or 8-ohm speaker systems.
●Ideal for both home and commercial sound installations.
●Only an 1/8" standard screwdriver and wire stripper are
required for installation.
●Power handling: 100 watts/channel continuous music
power.
●Frequency response: 20 Hz to 20 kHz +/-1.2 dB.
●Ten year parts and labor warranty.
●Proudly made in the USA.
3
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM

Installation Considerations
SVL-4 Power Handling
The SVL-4 is designed for use with a receiver or amplifier
having a maximum power output of 100 watts per channel at
8 ohms. Damage caused by the use of a higher-power receiv-
er or amplifier will void the warranty. Consult your Niles deal-
er, or receiver/amplifier manufacturer, if you are uncertain
about the power rating of your receiver or amplifier.
IMPORTANT: DO NOT USE THE SVL-4 WITH AMPS OR
RECEIVERS RATED AT MORE THAN 100 WATTS PER CHAN-
NEL RMS AT 8 OHMS.
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
connecting more than two pairs of speakers without using
some form of impedance correction.
4
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
IMPORTANT
DO NOT use the
SVL-4 with amps
or receivers rated
at more than 100
watts per channel
RMS at 8 ohms.
TOOLS
REQUIRED
• 1/8" Standard
Slotted Screwdriver
• Wire Stripper

The SVL-4 includes impedance correction circuitry which
protects your receiver or amplifier from low impedance loads.
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 SVL-4 presents to your receiver
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 SVL-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 SVL-4 with more than two 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 the receiver/amplifier manufac-
turer, if you are uncertain about the capabilities of the receiv-
er/amplifier.
Type of Speaker Wire
For most applications, we recommend you use 16 or 18
gauge stranded copper speaker wire for the SVL-4 connec-
tions. For wiring runs longer than 80 feet, 14 gauge wire is
recommended. Using speaker wire larger than 14 gauge for
the SVL-4 connections is not recommended—the wire may
5
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
"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.

not fit into the connectors. Never use solid-core, aluminum,
or "Romex" type wire with the SVL-4. When running speaker
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
though the speakers. If you must locate the SVL-4 wiring
near electrical devices, route the speaker wires several feet
away from the electrical wiring.
Using the SVL-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 SVL-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 SVL-4. See (Figure 1) on next
page for hookup diagram.
6
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM

7
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
Figure1
Using a
Tube Amplifier
Tube Amplifier
Niles SVL-4
150 150
AMPLIFIER
L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+
SPEAKER 4 SPEAKER 3 SPEAKER 2 SPEAKER 1
CONSTANT
PROTECTION
ON OFF
Niles Audio
Corporation, Inc.
Miami, Florida USA
NIL ES

8
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
SVL-4 SPEAKER SELECTION/VOLUME CONTROL SYSTEM
PROTECTION
1234
NILES
AMPLIFIER
L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+
SPEAKER 4 SPEAKER 3 SPEAKER 2 SPEAKER 1
CONSTANT
PROTECTION
ON OFF
Niles Audio
Corporation, Inc.
Miami, Florida USA
NIL ES
12 position volume control
provides greater attenuation
than conventional 10 position
designs.
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.
Two-piece
removable
connectors.
Constant
Impedance
Protection
Switch

Installation
1. Select a convenient location for the SVL-4.
2. Run all the necessary wiring to the SVL-4. Label the wires
for future reference. See (Figure 2).
9
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
TUNER 94.9
15
AMPLIFIER
L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+ L+ L- R- R+
SPEAKER 4 SPEAKER 3 SPEAKER 2 SPEAKER 1
CONSTANT
PROTECTION
ON OFF
Niles Audio
Corporation, Inc.
Miami, Florida USA
NIL ES
Niles SVL-4
Receiver
Speaker
Pair 4 Speaker Pair 3 Speaker Pair 2 Speaker Pair 1
Figure2
Wiring Diagram

3. Make the connections to the SVL-4. The amplifier/speaker
connectors on the SVL-4 are removable. If you wish, you
may remove the SVL-4's connectors to facilitate installation
[see (Figure 3)]. Strip 3/8" of insulation from the end of
each wire. Tightly twist the end of each wire until there are
no frayed ends. Insert each wire into the appropriate hole on
the connector terminals. Be certain that proper phasing is
observed—connect the positive terminals on the SVL-4 to
the positive terminals on the amplifier and speakers and the
negative terminals on the SVL-4 to the negative terminals on
the amplifier and speakers. Re-install the connectors if they
were removed. See (Figure 4).
4. Locate the pre-printed Room Labels. Affix the appropriate
label to the recessed area over each ON/OFF selector button.
1
0
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
Figure4
Installing the Connectors
Figure3
Removing the Connectors

Operation
The are two ways to use the SVL-4. You may play and adjust
the volume of one pair of speakers at a time, or play multiple
pairs simultaneously.
If you intend to play more than one pair of speakers at the
same time, you will need to become familiar with the opera-
tion of the SVL-4's PROTECTION button.
Playing One Pair of Speakers At a Time
1. Make sure the amplifier or receiver power is OFF and set
the volume to minimum.
2. Set the SVL-4 volume control for the speaker pair you wish
to play to maximum (fully clockwise).
3. Locate the ON/OFF button on the SVL-4 which corre-
sponds to the speaker pair you wish to play. Set it to the ON
position.
4. Turn on the amplifier or receiver and select a source, such
as the tuner or CD player.
5. Slowly turn up the amplifier or receiver volume and set it
to a comfortable (not maximum) listening level. Be careful
not to overdrive or "clip" your amplifier. If the sound
becomes muddy or distorted, you have reached the limit of
your amplifier's volume capability and should quickly reduce
the volume to avoid damaging your speakers.
11
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
"TECH TIP"
If your amplifier or
receiver has "A"
and "B" speaker-
pair outputs,
connect the SVL-4
to the "A" outputs.
Do not connect
anything to "B".
This will prevent
the amplifier or
receiver from driving
an unusually low
impedance load.

6. Using the appropriate volume control on the front of the
SVL-4, adjust the volume of the speakers to the desired lis-
tening level.
7. You can turn off the speakers by turning the appropriate
volume control on the SVL-4 fully counter-clockwise or by
pressing the ON/OFF button.
Playing Two or More Speaker Pairs Simultaneously
1. Make sure the amplifier or receiver power is OFF and set
the volume to minimum.
2. On the right side of the SVL-4's front panel is a button
labeled PROTECTION. This button activates the SVL-4's imped-
ance correction circuitry. The circuitry assures that your receiver
or amplifier will see a safe operating load when playing multi-
ple speaker pairs simultaneously. Since most receivers and
amplifiers are not rated for use below a 4 ohm load, you will
need to activate the PROTECTION button whenever the over-
all system impedance might fall below 4 ohms. Use the follow-
ing chart as a guide for setting the PROTECTION button.
1
2
S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
"TECH TIP"
You will need to
activate the SVL-4's
PROTECTION button
whenever the overall
system impedance
might fall below
4 ohms.
When playing the following speakers:
1 or 2 pair of 8-ohm speakers
3 or 4 pairs of 8-ohm speakers
1 pair of 4-ohm speakers
2, 3, or 4 pairs of 4-ohm speakers
Any combination of 4 and 8 ohm speakers
The Protection button should be:
OFF
ON
OFF
ON
ON
Set the PROTECTION button to the correct position using the chart shown above.

S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
1
3
3. Set the SVL-4 volume controls which correspond to the
speaker pairs you wish to play to maximum (fully clockwise).
4. Locate the appropriate ON/OFF buttons on the SVL-4. Set
them to the ON position.
5. Turn on the amplifier or receiver and select a source, such
as the tuner or CD player.
6. Slowly turn up the amplifier or receiver volume and set it
to a comfortable (not maximum) listening level. Be careful
not to overdrive or "clip" your amplifier. If the sound
becomes muddy or distorted, you have reached the limit of
your amplifier's volume capability and should quickly reduce
the volume to avoid damaging your speakers.
7. Using the appropriate volume controls on the front of the
SVL-4, adjust the volume of the speakers to the desired listen-
ing level.
8. You can turn off the speakers by turning the correspond-
ing volume controls on the SVL-4 fully counter-clockwise, or
by pressing the appropriate ON/OFF button. Refer to the
Protection chart for the correct setting of the PROTECTION
button.

S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM
1
4
Constant Protection Switch
The SVL-4 is equipped with a manual override for the protec-
tion circuit that enables you to defeat the front panel protec-
tion switch and maintain constant impedance protection.
This will safeguard your amplifier from being overdriven due
to accidental or improper use by anyone unfamiliar with the
equipment.
To engage this override, move the rear panel "CONSTANT
PROTECTION" switch to the "ON" position. Constant imped-
ance protection will be maintained until the switch is turned
to "OFF".
Balancing Speaker Volume
The volume control on your receiver or amplifier serves as the
"master" volume for all speaker pairs connected.
The volume level of the speakers may vary from room to
room. This is caused by several factors. Two lesser factors are
the size of the speaker and its efficiency. The largest factor is
the physical size of the room.
The SVL-4's volume controls allow you to adjust the volume
of each speaker pair individually. You can leave the amplifier
or receiver volume set at one position and use the SVL-4 vol-
ume controls exclusively.
SPECIFICATIONS
Audio Power
Handling
100 watts/channel
continuous music
power
Frequency Response
+/- 1.2 dB from 20 Hz
to 20 kHz
Mounting
Table-Top component
Wiring
Requirements
Individual runs of
2-conductor speaker
wire. Connectors
accommodate wire
sizes 14-22 gauge (16
gauge recommended)
Overall Dimensions
17" wide x 2" high x
9-1/4" deep
Weight
7 1/2 lbs.

Niles Audio
Corporation
www.nilesaudio.com
12331 S.W. 130 Street
Miami, Florida 33186
Tel: [phone]
Fax: [phone]
®
NILES
®
©1999 Niles Audio Corporation. All rights reserved. Because Niles constantly strives to improve the
quality of its products, Niles reserves the right to change product specifications without notice. Niles
and the Niles logo are registered trademarks of Niles Audio Corporation. Printed in USA 4/96
DS00095A