Film-Tech Forum ARCHIVE: dolby adjustment controls max min?

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Posted by Patrick de Groot (Member # 858) on 10-26-2003, 02:07 PM:

A question about the sound adjustment controls inside the dolby processor:
There are for example adjustment controls inside the cp65 for the surrounds.
There is a treble control. Will i boost or cut it when I turn it CW? And will i boost or cut the bass when I turn the bass control?
I can see it is numbered from 1 to 3. 2 is the center position I presume.
Please give me some answers. Thanks!

Posted by Aaron Sisemore (Member # 145) on 10-26-2003, 02:36 PM:

Don't mess with them unless you know what you are doing and have the proper equipment (an RTA) to make the adjustments.

-Aaton

Posted by Demetris Thoupis (Member # 833) on 10-26-2003, 02:39 PM:

Hello,
Dolby's manuals recomend that the equalizer settings of each channel should be pointing mostly at 12 o'clock, and no more than 3 o'clock or less than 9 o'clock. The bass and treble controls should be as clost to 12 o'clock as possible. If you turn them clockwise YES you are boosting them up and anticlockwise you are reducing them.
Hope this have been helpful.
Demetris Thoupis

Posted by Patrick de Groot (Member # 858) on 10-26-2003, 04:37 PM:

>>If you turn them clockwise YES you are boosting them up and anticlockwise you are reducing them.

The manual is confusing. In the section about subwoofer equalisation it says that turning "cut" max counter-clockwise will produce maximum cut en max CW will produce minimum cut...
So is this just the case for cut?

Posted by Gordon McLeod (Member # 33) on 10-26-2003, 05:49 PM:

I guess the question merits why do you want to adjust them
If you don't have the experience and the test equipment leave them alone.

Posted by Aaron Sisemore (Member # 145) on 10-26-2003, 08:33 PM:

Demetris: those are the wrong controls- those are the rough adjustments on the Cat 64 screen channel EQ cards.

Patrick is referring to the parametric eq settings for the surrounds on the Cat 441 card.

-Aaron

Posted by Patrick de Groot (Member # 858) on 10-27-2003, 02:17 AM:

I ask this because I want to look at the bass adjustment control of the surrounds, because maybe this is the reason that sometimes the surrounds crackle a little... If not I could easily set them back to the original setting.
So I still don't know which side will cut the bass. If it follows the "standard" CW should boost the bass and CCW should cut it [Smile]

Is this the case?

Posted by Darren Briggs (Member # 1071) on 10-27-2003, 04:15 PM:

If the surrounds crackle a little, sound like they are distorting or one of the speakers if u/s.

Is it one speaker only that crackles? sugest you leave the CP well alone, and get a cinema engineer in who knows where and what to look for.

Posted by Tom Wienholt (Member # 1510) on 10-27-2003, 09:23 PM:

Clockwise will boost and counter-clockwise will cut.