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SC-602 Amplifier User’s Manual
T
he SC-602 amplifier 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-602 amplifier 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.
You should set the crossover frequency to obtain a smooth and seamless transition from the
subwoofer to the main speakers in your system. If your main speakers are smaller units with
limited low frequency output, you may wish to choose a higher frequency (such as 100-120 Hz)
than you would with larger speakers which have greater low frequency output. The SC-602
amp’s crossover has a default of 80 Hz.
Most receivers and pr
ocessors provide an option to characterize main speakers as “large” or
“small” speakers. This will affect the speaker’
s crossover point. We recommend in most cases
setting the main speakers to “small,” despite their size and frequency response characteristics.
This is because the powerful 400 (x2) watt SC-602 amp combined with the SC-600 subwoofer
you have acquired are more likely suited to low bass reproduction than your amp and main
speaker. With the burden of low frequency reproduction relieved, your speakers will exhibit
better per
formance.
Disabling the Low-Pass Crossover (Subwoofer Direct)
Most multi-channel receiver/processors provide a crossover to the subwoofer (whereas most
r
eceivers do not). When using a multi-channel receiver, we suggest that you bypass /switch off
the SC-602 amp’s low-pass crossover. To do this, depress the Crossover UP button until the
numeric LED shows indicating that the low-pass crossover has been defeated. To reactivate
the low-pass crossover, simply push the crossover DOWN button to change to the
desir
ed fr
equency
.
A WORD ABOUT YOUR RECEIVER’S CROSSOVER
AND THE SC-602 AMPLIFIER CROSSOVER
Your Velodyne SC-602 amplifier is designed to operate using the full range audio signal for
input when using the built-in crossover. Many home theater processors/receivers have a
“subwoofer out” jack that performs this same function and are designed to be used with
a powered subwoofer.
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Rear Panel Connections — Detailed Explanation