Niles Audio SVL-4AB User Manual
SVL-4AB
INSTALLATION & OPERATION GUIDE
MODEL
SVL-4AB
SPEAKER SELECTION/VOLUME CONTROL SYSTEM
WITH A/B AMPLIFIER INPUTS
SVL-4AB
Introduction
The SVL-4AB is a combination speaker selector and volume
controller. The unit allows you to connect up to four pairs of
speakers to your stereo receiver or amplifier and adjust the
volume of each pair independently. You can choose to listen
to any one pair, any combination of pairs, or all pairs at once.
Additionally, you can connect two different stereo receivers
to the SVL-4AB by using its A and B amplifier inputs.
You don't have to worry about overloading either
amplifier. The SVL-4AB has individual protection circuits that
keep both of your amplifiers running safely, with any combination of speakers and amplifiers.
A perfect application for the SVL-4AB is individually controlling speaker "ON/OFF" and volume adjustment for four pairs
of speakers connected to two receivers. Different family
members can simultaneously listen to different musical selections through any of the four pairs of speakers.
The SVL-4AB adjusts the amplifiers signal with volume controls that use autoformers, not L-pads. The autoformers
assures that virtually no power will be wasted as heat by the
volume control.
TABLE OF CONTENTS
Introduction 1
Features and
Benefits 2
Installation
Considerations 4
Installation 9
Operation 11
Specifications 14
S
PEAKERSE LECTION/VOLUMECONTROLSYSTEM
SVL-4AB
Speaker Selection/
Volume Control
System with A/B
Amplifier Inputs
Features and Benefits
The SVL-4AB offers a number of improvements over other
speaker selector/volume controllers:
● Amplifier A/B Switching— The SVL-4AB provides amplifier
switching for each pair of speakers. The switches are
“break-before-make“ and simultaneously switch both
grounds and hots. This allows any two amplifiers to safely
and reliably operate simultaneously.
● The SVL-4AB uses 12-position POP-FREE 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.
● Pre-printed Room Labels are included for easy identification
of speaker ON/OFF buttons.
● Isolated left and right channel ground returns make the
SVL-4AB compatible with all types of amplifiers.
2
S
PEAKERSELECTION/VOLUMECONTROLSYSTEM
TECH
SUPPORT
HOTLINE
If you have
questions regarding
the operation of the
Niles SVL-4AB, contact your local Niles
dealer or Niles
Customer Service at
1-800-289-4434.
● Rear panel switches for constant or selectable impedance
protection for each amplifier. You can use constant protection on one of your two amplifiers and manual protection
for the other.
● Self-cleaning, silver-plated switch contacts assure many
years of trouble free use.
● 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-4AB.
● 100% tested, electronically and acoustically, for frequency
response, distortion and power handling.
● Standard 17" width allows the SVL-4AB 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.
● 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
PEAKERSELECTION/VOLUMECONTROLSYSTEM
Installation Considerations
SVL-4AB Power Handling
The SVL-4AB is designed for use with receivers or amplifiers
having a maximum power output of 100 watts per channel at
8 ohms. Damage caused by the use of higher-power receivers
or amplifiers will void the warranty. Consult your Niles dealer
or receiver/amplifier manufacturer if you are uncertain about
the power rating of your receivers or amplifiers.
IMPORTANT: DO NOT USE THE SVL-4AB WITH AMPS OR
RECEIVERS RATED AT MORE THAN 100 WATTS PER CHANNEL
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
PEAKERSELECTION/VOLUMECONTROLSYSTEM
IMPORTANT
DO NOT use the
SVL-4AB 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
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