Requisite Audio Engineering L2M MKIII M/S VERSION Manuel de l'opérateur télécharger pdf (Page 16)

FRONT PANEL CALIBRATION POINTS (continued)

RESET STEREO ADJUST to higher sensitivity:

•

Inject a +10dB 1-kHz tone (both channels). Verify level using an external DMM or suitable me-

ter. If your DMM has a dB function, select that. If not, set to A/C and read 2.45VAC across

pins 2&3 of the OUTPUT XLR.

•

Select GR on the METER SELECT and observe that both VU METERs read 0dB.

•

Select MONO on PK REDUCTION (meter mode select).

•

Set PEAK REDUCTION (both channels) to the 12 o’clock position.

•

Raise the STEREO ADJ trimmer on each channel until the pointer on the VU meter stops

dropping. This will indicate the level is back to it’s highest setting.

•

Once this is done, refer to the STEREO ADJUST - CALIBRATION PROCEDURE (see above)

and re-calibrate STEREO ADJ.

If the above procedure was ineffective in recovering sufﬁcient sensitivity, this could be an indi-

cation that the 12AX7 (2ea) and 6AQ5 (2ea) tubes (rear panel, left of optos) have exceeded their

useful lives and replacement is required. This could be the case for only one channel, however,

it would be good practice to change the tubes for both channels, at this time.

GR ZERO ADJUST

The GR ZERO ADJUST trimmer is used to calibrate the Peak Reduction Meter. At rest, the me-

ter should read 100% or 0dB (during periods of no gain reduction).

GR ZERO ADJUST - OPERATIONAL NOTE:

Before determining that adjustments are necessary, be sure to allow 10 minutes of system warm-

up time and at least 5 minutes rest from any peak reduction activity.

THE PAL PLUS MKIII

R e q u i s i t e A u d i o E n g i n e e r i n g! L2M MkIII

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Requisite Audio Engineering L2M MKIII M/S VERSION Manuel de l'opérateur Page 16