LACHAPELL AUDIO 503
4
503 CONTROLS
CONTROL DETAILS
• HIGH FREQUENCY SWEEP CONTROL: Fully variable sweep range; 2.5kHz to 20kHz.
Q value of 1 at +8dB.
• MID FREQUENCY SWEEP CONTROL: Fully variable sweep range; 325Hz to 5kHz.
Q value of 1 at +8dB.
• LOW FREQUENCY SWEEP CONTROL: Fully variable sweep range; 30Hz to 400kHz.
Q value of 1 at +8dB.
• HIGH-PASS FILTER (HP): 2-position HP filter provides 3dB cut at 150Hz or 50Hz.
• LOW-PASS FILTER (HP): 2-position HP filter provides 3dB cut at 5kHz or 10kHz.
• TRIM CONTROL: This is a transformer-less post-EQ gain stage providing 6dB of clean cutting or
boosting for the overall signal being processed. This control is post EQ In/Out control.
• FREQUENCY CUT/BOOST CONTROLS: Provides 12dB of cutting or boosting of selected frequency
from corresponding sweep control. A center detent is available on each band.
• EQ IN/OUT: This is a dual color LET toggle switch. Red will indicate the EQ settings have been by-
passed, green will indicates active EQ. The control does not effect the trim.
LaChapell
Audio
Model 503
3-Band EQ
+12
-12
+6
-6
+12
-12
+12
-12
400
250
50
3k
500
12k
3k
160
30
5k
1.8k
325
20k
10k
2.2k
EQ OUT
50
150
.
EQ IN
Low
Mid
High
Trim
5k
10k
.
EQ IN/OUT
TOGGLE
HIGH BAND
CUT & BOOST
LOW-PASS
FILTER
TRIM
CONTROL
HIGH BAND
FREQ.
MID BAND
CUT & BOOST
MID BAND
FREQ.
LOW BAND
CUT & BOOST
LOW BAND
FREQ.
HIGH-PASS
FILTER
