Velodyne Acoustics SUBCONTRACTOR SC-600 - Manual (Page 11)

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SC-600 Amplifier User’s Manual
The SC-600 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.
A B O U T L O W - P A S S C R O S S O V E R S
All of the SC-600 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-600
amp’s crossover has a default of 80 Hz.
Most receivers and processors 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 watt SC-600 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 performance.
D i s a b l i n g t h e L o w - P a s s C r o s s o v e r ( S u b w o o f e r D i r e c t )
If your receiver/processor provides a crossover to the subwoofer, you may want to bypass
/switch off the SC-600 amp’s low-pass crossover. To do this, depress BOTH the Crossover UP
and Crossover DOWN buttons simultaneously. The numeric LED will show indicating that
the low-pass crossover has been defeated. To reactivate the low-pass crossover, simply push
the crossover UP or crossover DOWN buttons.
A W O R D A B O U T Y O U R R E C E I V E R ’ S C R O S S O V E R
A N D T H E S C - 6 0 0 A M P L I F I E R C R O S S O V E R
Your Velodyne SC-600 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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R ear Panel Connections — Detailed Explanation