Owners Manual

24
Limiter Trims.
OPTO LIMITER
+4 dBu (1.23vAC), 1kHZ Oscillator fed into XLR LINE INPUTS.
1) VU select = GR. Verify reading close to 0 VU.
2) L&R LIMIT = ON.
3) Verify VU’s within 3 dB of zero. Trim ZERO VU GR on Side-chain board so that
VU = 0 with no gain reduction.
4) VU select = O/P. Set ELOP LIMIT threshold knob to 9:00 O’clock. VU’s should show some
reduction.
5) Adjust OPTO GAIN TRIM for 4 dB of limiting.
6) VU mode = GR. Adjust OPTO CAL TRIM also for -4 dB displayed on VU’s.
7) VU mode = O/P Verify operation of STEREO LINK & BOTH&EXT
8) Run through SC HZ. Should see more GR at 100 and more at 200.
9) Return ELOP LIMIT fully CW (off), Return VU mode = O/P
FET LIMITER
+4 dBu (1.23vAC), 1kHZ Oscillator fed into XLR LINE INPUTS
1) First do LED METER TRIMS steps 1&2 ONLY !
2) Start with FET BIAS, FET BALANCE, FET LIMIT trims in center. (Main Board)
RELEASE = .1s
ATTACK = VF
FET LIMIT fully CW (off)
LED = PEAK
DUAL MONO. (no link)
2) Adjust FET BIAS for 1 dB of reduction.
3) Increase oscillator by 6 dB’s (Input = 10dBu)
4) Adjust FET LIMIT fully CCW.
5) Adjust FET BALANCE for maximum gain reduction. Usually trim will sit close to the center
position. Trim will show minimum gain reduction in both sides of the trim.
6) Return FET LIMIT fully CW (off), Decrease Oscillator by 6 dB’s (Output = +4dBu) or (VU = 0)
7) Repeat steps 2 to 6
8) Adjust FET BIAS for .1 dB ( or just at the threshold when reduction begins ).
9) FET LIMIT = 9:00 O’clock. Adjust GR for 4 dB of limiting (Output = 0 dBu )
10) LED = GR. Adjust FET METER trim (sidechain board) for 4 Yellow segments lit.
11) Increase Oscillator by 6 dB’s Verify 12 Yellow segments lit (3rd dot from top).
12) Run through RELEASE settings. Should see deeper GR at ‘2 sec’ and less at 10mS in smooth
steps with a jump at CLIP. With RELEASE at .1S, run through ATTACK settings, and should see
less GR at F and less again at M.
13) Decrease Oscillator by 6 dB’s (VU = 0), Return FET LIMIT fully CW (off),
Return VU = O/P.