Velodyne SubContractor Series - Manual (Page 15)

www.velodyne.com SC-1250 Amplifier User’s Manual - 9
(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. onlyconnect one
subwoofer per red/black pair of subwoofer output terminals - DO NOT connectthe subwoofers in a
“daisy chain” configuration.
Note: SC series subwoofers are designed so that TWo subwoofers can be driven from asingle 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 canbe driven with the SC-1250, but not TWo 4 ohm
woofers. If you attempt to run more than asingle 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 Crossovers
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.