M O D E L SPS-4 SPS-4 SPEAKER SELECTION SYSTEM NILES ® INSTALLATION & OPERATION GUIDE
S P E A K E R S E L E C T I O N S Y S T E M SPS-4 Speaker Selection System TABLE OF CONTENTS Introduction Introduction 1 Features and Benefits 2 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.
S P E A K E R S E L E C T I O N S Y S T E M 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.
S 3 P E A K E R S E L E C T I O N S Y S T E M ● 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 (+0 dB,-0 dB) from 20 Hz to 20 kHz. ● Ten year parts and labor warranty. ● Proudly made in the USA.
S P E A K E R S E L E C T I O N S Y S T E M Installation Considerations SPS-4 Power Handling The SPS-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 receiver or amplifier will void the warranty. Niles speaker selectors with higher power handling capabilities are available.
S P E A K E R S E L E C T I O N S Y S T E M 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. "TECH TIP" The actual impedance load the SPS-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 SPS-4 will present a 4.
S P E A K E R S E L E C T I O N S Y S T E M 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 dealer, 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.
S S P E A K E R S E L E C T I O N Y S T E M Tube Amplifier Figure 1 Using a Tube Amplifier 150 150 Niles SPS-4 AMPLIFIER + SPEAKER 4 + + - - SPEAKER 3 SPEAKER 2 + + - - SPEAKER 1 + NILES - Niles Audio Corporation, Inc.
S Recessed areas for custom room labels. S P E A K E R S E L E C T I O N Y S T E M SPS-4 SPEAKER SELECTION SYSTEM PROTECTION Attractive low-profile design. 1 2 3 NILES 4 Connect up to four pairs of speakers. Simple push-button operation. AMPLIFIER + SPEAKER 4 + + - - Protection switch safeguards your receiver or amplifier even with all 4 pairs of speakers playing. SPEAKER 3 SPEAKER 2 + + - - SPEAKER 1 + NILES - Niles Audio Corporation, Inc.
S S P E A K E R S E L E C T I O N Y S T E M 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). Receiver TUNER 94.9 Figure 2 Wiring Diagram 15 Niles SPS-4 AMPLIFIER + SPEAKER 4 + + - - SPEAKER 3 SPEAKER 2 + + - - SPEAKER 1 + NILES - Niles Audio Corporation, Inc.
S P E A K E R S E L E C T I O N S Y S T E M 3. Make the connections to the SPS-4. 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 spring-loaded connector terminals.
S P E A K E R S E L E C T I O N S Y S T E M Operation "TECH TIP" If your amplifier or receiver has "A" and "B" speakerpair outputs, connect the SPS-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. There are two ways to use the SPS-4. You may play 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 S Y S T E M Playing Two or More Speaker Pairs Simultaneously 1. Make sure the amplifier or receiver power is OFF and set the volume to minimum. "TECH TIP" You will need to activate the SPS-4's PROTECTION button whenever the overall system impedance might fall below 4 ohms. 2. On the right side of the SPS-4's front panel is a button labeled PROTECTION. This button activates the SPS-4's impedance correction circuitry.
S P E A K E R S E L E C T I O N S Y S T E M 3. Locate the ON/OFF buttons on the SPS-4 which correspond to the speaker pairs you wish to play. Set them 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.
S P E A K E R S E L E C T I O N S Y S T E M 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.
NILES ®® 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 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.
