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Aumumano 13th April 2016 10:30 PM

analog gain reduction meter adjustment question
 
Hey guys, problably a stupid question.
My Drawmer 1968 ME is showing a strange behaviour in the gain reduction meter.
In silence, with no signal in, stays at +3 db.
My question:
Is the gain reduction only happening when the needle is going below 0, or, in the case of meter not properly aligned, i can consider this +3 db the "new zero"?
I can see the needle punping a lot in the 0-3db area, but i cant hear a lot happening sonically.
I know this is probably really basic but it i am kind new to gain reduction analog vu meters!
Thanks

[email protected] 14th April 2016 12:03 PM

Quote:

Originally Posted by Aumumano (Post 11836586)
Hey guys, problably a stupid question.
My Drawmer 1968 ME is showing a strange behaviour in the gain reduction meter.
In silence, with no signal in, stays at +3 db.
My question:
Is the gain reduction only happening when the needle is going below 0, or, in the case of meter not properly aligned, i can consider this +3 db the "new zero"?
I can see the needle punping a lot in the 0-3db area, but i cant hear a lot happening sonically.
I know this is probably really basic but it i am kind new to gain reduction analog vu meters!
Thanks

+3db is the new zero. But you could just recalibrate the meters like this:

Switch the meters to G.R.
1. Using Preset R50 set the GR meter to give a reading of +3dBu.
2. Repeat for Channel 2 (Preset R82).
3. Adjust preset R48 on Channel 1 to set the GR meter to read 0dB.
4. Repeat for Channel 2 (Preset R80).
5. Rotate the THRESHOLD control on Channel 1 clockwise to show 10dBs of gain reduction on the VU meter of the unit.
6. Switch the unit back to GR and adjust preset R36 to give a gain reduction of 10dB.
7. Repeat for Channel 2 (Preset R86).
8. Remove the Gain Reduction. Repeat above steps until no further adjustment is necessary.
9. Switch between VU and GR and check that the meters are identical. Adjust as necessary.

TheLastByte 18th April 2016 02:06 AM

Drawmer 1968 ME Calibration Method:

Or......you could Simply go about things the right way and go straight here where I Stuck the Drawmer 1968 ME Drawmer Compressor Alignment procedure, it's nothing to tough and you'll be up and running ASAP!

https://www.gearslutz.com/board/high...on-method.html

Good luck!

TheLastByte 18th April 2016 02:09 AM

Quote:

Originally Posted by [email protected] (Post 11837498)
+3db is the new zero. But you could just recalibrate the meters like this:

Switch the meters to G.R.
1. Using Preset R50 set the GR meter to give a reading of +3dBu.
2. Repeat for Channel 2 (Preset R82).
3. Adjust preset R48 on Channel 1 to set the GR meter to read 0dB.
4. Repeat for Channel 2 (Preset R80).
5. Rotate the THRESHOLD control on Channel 1 clockwise to show 10dBs of gain reduction on the VU meter of the unit.
6. Switch the unit back to GR and adjust preset R36 to give a gain reduction of 10dB.
7. Repeat for Channel 2 (Preset R86).
8. Remove the Gain Reduction. Repeat above steps until no further adjustment is necessary.
9. Switch between VU and GR and check that the meters are identical. Adjust as necessary.

While Trev certainly knows his comps it's all laid out for you here!

https://www.gearslutz.com/board/high...on-method.html

Aumumano 18th April 2016 04:03 AM

Quote:

Originally Posted by [email protected] (Post 11837498)
+3db is the new zero. But you could just recalibrate the meters like this:

Switch the meters to G.R.
1. Using Preset R50 set the GR meter to give a reading of +3dBu.
2. Repeat for Channel 2 (Preset R82).
3. Adjust preset R48 on Channel 1 to set the GR meter to read 0dB.
4. Repeat for Channel 2 (Preset R80).
5. Rotate the THRESHOLD control on Channel 1 clockwise to show 10dBs of gain reduction on the VU meter of the unit.
6. Switch the unit back to GR and adjust preset R36 to give a gain reduction of 10dB.
7. Repeat for Channel 2 (Preset R86).
8. Remove the Gain Reduction. Repeat above steps until no further adjustment is necessary.
9. Switch between VU and GR and check that the meters are identical. Adjust as necessary.

Thanks a Trevor !But I am feeling like a complete stupid...
What are those "Presets R86,80"? I dont have any clue of what that is!!!

[email protected] 18th April 2016 07:11 AM

Quote:

Originally Posted by Aumumano (Post 11844637)
Thanks a Trevor !But I am feeling like a complete stupid...
What are those "Presets R86,80"? I dont have any clue of what that is!!!


If you lift the hood there are a number of flip switches inside.