User manual NILES SVL-4AB

[. . . ] 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. [. . . ] The lower the AWG number, the larger the wire, i. e. , 12 AWG wire is physically larger 5 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM 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". 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 though the speakers. If you must locate the SVL-4AB wiring near electrical devices, route the speaker wires several feet away from the electrical wiring. Using the SVL-4AB with Tube-Type Amplifiers Virtually all tube amplifiers must have a load connected at all times. If one of the amplifiers to be connected to the SVL-4AB 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-4AB. See (Figure 1) on next page for a hookup diagram. 6 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM Tube Amplifier Figure 1 Using a Tube Amplifier 150 5 Watt Resistor 150 150 Niles SVL-4AB AMPLIFIER L+ ON OFF Niles Audio Corporation, Miami, Florida USA SPEAKER 4 R+ L+ LRR+ L+ SPEAKER 3 LRR+ L+ SPEAKER 2 LRR+ L+ SPEAKER 1 LRR+ L- R- CONSTANT PROTECTION 7 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM Recessed areas for custom room labels. 12 position volume control provides greater attenuation than conventional 10 position designs. Attractive low-profile design. SVL- 4AB SPEAKER SELECTION/VOLUME CONTROL SYSTEM A B OFF ON A B OFF ON A B OFF ON A B OFF ON PROTECTION SPEAKER 1 SPEAKER 2 SPEAKER 3 SPEAKER 4 Each speaker pair can individually select one of two source amplifiers with a dedicated push-button A/B switch. Each speaker pair is independently activated with a simple pushbutton On/Off switch. Protection switch safeguards both of your receivers or amplifiers even with one amplifier playing all 4 pairs of speakers. AMPLIFIER A CONSTANT PROTECTION ON OFF ON OFF AMPLIFIER B R+ L+ LRR+ L+ SPEAKER 4 LRR+ L+ SPEAKER 3 LRR+ L+ SPEAKER 2 LRR+ L+ SPEAKER 1 LRR+ L+ L- R- NILES Niles Audio Corporation, Inc. Miami, Florida USA A B Constant Impedance Protection Switches for each amplifier. Two-piece removable connectors. 8 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM Installation 1. Select a convenient location for the SVL-4AB. Run all the necessary wiring to the SVL-4AB. See (Figure 2). Figure 2 Wiring Diagram TUNER 94. 9 15 Receiver A AMPLIFIER L+ ON OFF Niles Audio Corporation, Miami, Florida USA SPEAKER 4 R+ L+ LRR+ L+ SPEAKER 3 LRR+ L+ SPEAKER 2 LRR+ L+ SPEAKER 1 LRR+ L- R- CONSTANT PROTECTION Niles SVL-4AB Speaker Pair 4 9 Speaker Pair 3 Speaker Pair 2 Speaker Pair 1 S PEAKER S ELECTION /V OLUME C ONTROL S YSTEM 3. 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 . [. . . ] 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. Constant Protection Switches SPECIFICA TIONS 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" (432mm) wide x 2" (51mm) high x 9 1/4" (235mm) deep Weight 7 1/2 lbs. (3. 4 kg). The SVL-4AB is equipped with rear panel overrides of the protection circuits that enables you to maintain constant impedance protection regardless of the position of the front panel switch. This will safeguard either or both of your amplifiers from being overdriven due to accidental or improper use by anyone unfamiliar with the equipment. [. . . ]