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APG SPDS12S - Description of Controls; Front Panel

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DYNAMIC PROCESSORS 5
DESCRIPTION OF CONTROLS
FRONT PANEL
A) SUB-WOOFER CONTROLS: :
Sub-woofer selection:
The row of switches located at the left of the unit allows to configure it for the type of sub-woofer
to be used. There is a choice of 8 types of sub-woofers, 4 Standard and 4 High Power type
(represented by "S" on the front panel). Only one of the first four switches must be engaged at one
time. The “S” switch is used to choose the Standard (released) or High Power type (engaged).
2) Phase: When depressed this push-button introduces a polarity reversal to compensate wiring
problems or acoustical phase reversals.
3) Align: When depressed, this push-button introduces a delay of ƒ wavelengths at the cross-over
frequency. In conjunction with the Phase switch, it allows optimum alignment of the sub-woofer
response.
4) Sub: this potentiometer controls the level of the sub-woofers. A center detent indicates the
nominal position. The range is from infinite attenuation to 6 dB gain.
B) MAIN SPEAKERS CONTROLS:
1) HF Stacking EQ: This potentiometer is used to equalize the power response when multiple stacks
are built, with an accompanying low-frequency coupling effect.
5) With Sub/No Sub: When engaged this switch inserts a High pass filter in the signal path,
providing the necessary cross-over function needed when subwoofers are used.
6) High ON/OFF: When released, this switch cuts the signal going to the main speakers.