Requisite Audio Engineering L2M MKIII M/S VERSION Manual do Operador descarregar pdf (Página 13)

FRONT PANEL CALIBRATION POINTS

ZERO ADJ

The ZERO ADJ trimmer (2 each) is used to adjust the meter while in the GR (Gain Reduction)

mode. When METER SELECT is placed in the GR position, the meter should read 100% or 0dB

during periods of no gain reduction, indicating no PEAK REDUCTION is occurring.

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. Also, be sure the METER

SELECT is in the GR position.

GR TRACK

The GR TRACK trimmer (2 each) is used to adjust the tracking accuracy of the GR

METER relative to the amount of GAIN REDUCTION that is occurring in the audio.

GR TRACK - CALIBRATION PROCEDURE:

•

Allow 10 minutes of system warm-up time and 1 minute rest from peak reduction activity.

•

Set PEAK REDUCTION & LIMITER RESPONSE fully-counterclockwise.

•

Set OUTPUT LEVEL, LIMITER FEEDBACK & STEREO LEVEL RIDE to UNITY.

•

Set RATIO to 3:1 and IN/BYPASS to IN

•

Determine that ZERO ADJUST has been made (see above).

•

Inject a +10dB 1-kHz tone (2.45V). Verify level using an external DMM or suitable meter.

•

Select +10 on the METER SELECT and observe that the VU METER reads 0dB.

•

If VU METER does not show 0dB in the +10 setting refer to VU ADJUST (see below).

•

Increase PEAK REDUCTION until the VU METER drops to -4dB.

•

Using METER SELECT, set to GR

•

The GR METER should show -5dB. The additional 1dB is to compensate for meter ballistics of

300 milliseconds.

•

After adjusting GR TRACKING, turn off the 1-kHz tone and allow a few moments of rest to

verify that the needle returns to 100% or 0dB.

•

Since ZERO ADJ and GR TRACK are interactive it may be necessary to repeat this process

(from step 5) a few times, readjusting ZERO ADJ and GR TRACK.

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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THE L2M MKIII M/S VERSION 1

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