M O D E L SVL-4AB SVL-4AB SPEAKER SELECTION/VOLUME CONTROL SYSTEM WITH A/B AMPLIFIER INPUTS I N S TA L L AT I O N & O P E R AT I O N G U I D E
S S P E A K E R E L E C T I O N / V O L U M E C O N T R O L S Y S T E M SVL-4AB Speaker Selection/ Volume Control System with A/B Amplifier Inputs TABLE OF CONTENTS Introduction Introduction 1 Features and Benefits 2 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.
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L S Y S T E M 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.
S 3 P E A K E R S E L E C T I O N / V O L U M E C O N T R O L S Y S T E M ● 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 installation and hookup.
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L S Y S T E M 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.
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L S Y S T E M The SVL-4AB includes impedance correction circuitry which protects each of your receivers or amplifiers from low impedance loads. The circuitry assures that both of your receivers or amplifiers will recognize a safe operating load, even when one amplifier is playing all four speaker pairs at the same time. "TECH TIP" Wire size is expressed by it's AWG (American Wire Gauge) number.
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L S Y S T E M may not fit into the connectors. Never use solid-core, aluminum, or "Romex" type wire with the SVL-4AB. 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".
S P E A K E R S / V E L E C T I O N C O L U M E O N T R O L Tube Amplifier Figure 1 Using a Tube Amplifier 150Ω 5 Watt Resistor 150 150 Niles SVL-4AB AMPLIFIER L+ ON OFF Niles Audio Corporation, Miami, Florida USA 7 CONSTANT PROTECTION L- R- SPEAKER 4 R+ L+ L- R- SPEAKER 3 R+ L+ L- R- SPEAKER 2 R+ L+ L- R- SPEAKER 1 R+ L+ L- R- R+ S Y S T E M
S S P E A K E R E L E C T I O N Recessed areas for custom room labels. / V C O L U M E S O N T R O L Y S T E M Attractive low-profile design. 12 position volume control provides greater attenuation than conventional 10 position designs.
S P E A K E R S E L E C T I O N / V C O L U M E S O N T R O L Y S T E M Installation 1. Select a convenient location for the SVL-4AB. 2. Run all the necessary wiring to the SVL-4AB. Label the wires for future reference. See (Figure 2). TUNER Figure 2 Wiring Diagram 94.
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L 3. Make the connections to the SVL-4AB. The amplifier/speaker connectors on the SVL-4AB are removable. If you wish, you may remove the SVL-4AB'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 .
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L S Y S T E M Operation "TECH TIP" If your amplifier or receiver has "A" and "B" speakerpair outputs, connect the SVL-4AB to the "A" outputs. Do not connect anything to "B". This will prevent the amplifier or receiver from driving an unusually low impedance load. The are two ways to use the SVL-4AB. You may play and adjust the volume of one pair of speakers at a time, or play multiple pairs simultaneously.
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L 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 control on the front of the SVL-4AB, adjust the volume of the speakers to the desired listening level. 8.
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L S Y S T E M When playing the following speakers: The Protection button should be: 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 OFF ON OFF ON ON Any combination of 4 and 8 ohm speakers Set the PROTECTION button to the correct position using the chart shown above.
S P E A K E R S E L E C T I O N / V O L U M E C O N T R O L 9. You can turn off the speakers by turning the corresponding volume controls on the SVL-4AB fully counter-clockwise, or by pressing the appropriate ON/OFF button. Refer to the Protection Chart located on page 13 for the correct setting of the PROTECTION button. 10. At any time, you may choose to switch any of the active speaker pairs to one or the other of the amplifiers by pressing the corresponding amplifier A/B button.
Niles Audio Corporation www.nilesaudio.com 12331 S.W. 130 Street Miami, Florida, 33186 Tel: (305) 238-4373 Fax: (305) 238-0185 © 1999 Niles Audio Corporation All rights reserved. Because Niles believes in constantly improving its products, Niles reserves the right to change product specifications without notice. Niles and the Niles logo are registered trademarks of Niles Audio Corporation.
