Velodyne Acoustics SPL-1200R - Manual (Page 7)

(6) SPEAKER LEVEL INPUT Terminals
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.
(7) MIC INPUT
Connect the supplied microphone for the Auto EQ feature to
this mini-jack.
(8) IR INPUT
Connect an IR repeater to this jack for use with universal
remote systems.
(9) 12v TRIGGER
When this mini jack is connected, the unit remains in power-
off mode until 12 volts is supplied across the two leads.
Polarity is irrelevant.
REAR PANEL CONNECTIONS -
DETAILED EXPLANATION
Your new subwoofer is equipped with both speaker-level and
line-level inputs. Use the RCA/Phono type “INPUT” jacks when
connecting your subwoofer to 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.
Low-Pass Crossover
Both sets of 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 40 to 120 Hz. The subwoofer’s response will
begin rolling off above the frequency you set this control to.
You should set the crossover frequency to obtain a smooth and
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