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

FRONT PANEL CALIBRATION POINTS (continued)

STEREO ADJ - OPERATIONAL NOTE:

Overtime, (perhaps many years) it will become evident that STEREO ADJ will need to be reset

to a higher overall level. The sysmptom will be that PEAK REDUCTION needs to be set to it’s

fully-clockwise position to initiate suﬁcient gain reduction for source material that has a good

deal of level.

RESET STEREO ADJ FOR 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.

THE L2M MKIII M/S VERSION

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