Velodyne Acoustics SC-12 Speaker Level Input Terminals See Figure, Subwoofer Connection Terminals

(18) Speaker Level Input Terminals (See Figure 5)

Connect these input terminals to the speaker output terminals of your amplifier or receiver. If you use this method of connection, when you go to the receiver speaker set up menu, make sure you select the “large” speaker option.

(19) Subwoofer Connection Terminals

Connect these output terminals to the subwoofer(s) being controlled by the SC-1250. Only connect ONE subwoofer per red/black pair of subwoofer output terminals - DO NOT connect the subwoofers in a “daisy chain” configuration.

Note: SC series subwoofers are designed so that TWO subwoofers can be driven from a single SC-1250 amplifier. If you are using the SC-1250 to power a non-SC subwoofer, make sure you check the resistance of the subwoofer’s voice coil. A SINGLE 4 ohm subwoofer can be driven with the SC-1250, but not TWO 4 ohm woofers. If you attempt to run more than a single 4 ohm subwoofer, internal protection circuitry will activate within the SC-1250.

Caution!!!

To avoid damage to your SC-1250, be sure to maintain correct polarity when making all connections. Red (positive) to red, and black (negative) to black. Be sure that all connections are tight, and that there are no loose strands or frayed wires.

(20) Power Cord Adaptor

Connect the detachable 117V~60Hz 15A AC power plug to this male interface connection. The detachable cord allows for easy replacement should the original be damaged.

(21) Fuse

If the unit is not functioning, check the fuse. If the fuse is blown, replace with an identically rated fuse. If the fuse blows again, refer the unit for service.

(22) Master Power Switch

Press the POWER switch to the ON position to activate the amplifier. If the unit is to be left unused for an extended period of time, move this switch to the OFF position to prolong the life of the amplifier.

REAR PANEL CONNECTIONS – DETAILED EXPLANATION

The SC-1250 is equipped with both speaker-level and line-level inputs. Use the RCA/Phono type “INPUT” jacks when connecting from a pre-amp, signal processor, or line-level crossover. The “SPEAKER LEVEL INPUT” jacks connect directly to the speaker outputs of an integrated amplifier or receiver. Your amplifier section will notice no additional loading effects when you use these inputs because of their high impedance.

Note: Do not use both the RCA/Phono “INPUT” connections and “SPEAKER LEVEL INPUT” connections simultaneously.

About Low - Pass Cr ossovers
All of the SC-1250 inputs sum the left and right channels together and the resulting signal is
passed through an adjustable low-pass crossover before being amplified. The crossover control
allows you to adjust the upper limit of the subwoofer’s frequency response from 30 to 160 Hz.
The subwoofer’s response will begin rolling off above the frequency you set this control to. The
slope is 24 dB/octave.
.w w w . v e l o d y n e . c o m	SubContractor User’s Manual 9