User manual NILES SVL-2

[. . . ] 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 attenuation instead of the usual 20 or 30 dB. Pre-printed Room Labels are included for easy identification of speaker ON/OFF buttons. [. . . ] 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 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. Locating speaker wires too close to a light dimmer or switch may cause a "buzzing" or "popping" sound to be heard thought the speakers. If you must locate the SVL-2 wiring 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. 5 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM near electrical devices, route the speaker wires several feet away from the electrical wiring. Using the SVL-2 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-2 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-2. See (Figure 1) for hookup diagram. Tube Amplifier Figure 1 Using a Tube Amplifier 150 150 Niles SVL-2 AMPLIFIER SPEAKER 2 SPEAKER 1 + + + + NILES Niles Audio Corporation, Inc. Miami, Florida USA L R - L R L R - 6 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM 12 position volume control provides greater attenuation than conventional 10 position designs. Recessed areas for custom room labels. SVL-2 SPEAKER SELECTION/VOLUME CONTROL SYSTEM PROTECTION Attractive low-profile design. 1 2 NILES Simple push-button operation. Connect up to two pairs of speakers. Protection switch safeguards your receiver or amplifier even with both pairs of speakers playing. AMPLIFIER SPEAKER 2 SPEAKER 1 + + + + NILES Niles Audio Corporation, Inc. Miami, Florida USA L R - L R L R - Spring loaded push connectors. 7 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM Installation 1. Select a convenient location for the SVL-2. Run all the necessary wiring to the SVL-2. See (Figure 2). Receiver TUNER 94. 9 15 Figure 2 Wiring Diagram Niles SVL-2 AMPLIFIER SPEAKER 2 SPEAKER 1 + + + + NILES Niles Audio Corporation, Inc. Miami, Florida USA L R - L R L R - Speaker Pair 2 Speaker Pair 1 8 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM 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 springloaded connector terminals. Be certain that proper phasing is observed -- connect the positive terminals on the SVL-2 to the positive terminals on the amplifier and speakers and the negative terminals on the SVL-2 to the negative terminals on the amplifier and speakers. Affix the appropriate label to the recessed area over each ON/OFF selector button. Figure 3 Removing the Connectors 9 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM Operation The are two ways to use the SVL-2. You may play and adjust the volume of either pair of speakers independently, or both 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 overall system impedance might fall below 4 ohms. Use the following chart as a guide for setting the PROTECTION button. When playing the following speakers: 1 or 2 pair of 8-ohm speakers 1 pair of 4-ohm speakers 2 or more pairs of 4-ohm speakers Any combination of 4 and 8 ohm speakers 11 The Protection button should be: OFF 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 3. Set both SVL-2 volume controls to maximum. Turn on the amplifier or receiver and select as source, such as the tuner or CD player. [. . . ]