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Old 03-15-07, 01:41 PM   #17 (Link)
 
brucek
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Re: calibration confusion!


Quote:
I get so confused about where I am supposed to alter the volume - mixer or amp. I have the amp quite high to get a level (about -12).
If that's the case, then raise the Wave and Output volume to 1.000 and then use the receivers volume control to set the Radio Shack SPL meter to 75dB.

Your chart is very good. (although you need the BFD for sure )

Quote:
I find the relationship with room EQ (it's a denon amp) and auto setup, changing the subs input to set the highest level for the BFD, then altering the subs volume to match the fronts, then altering the volume in REL and I am totally confused.
The input level to the BFD is totally contolled by the receivers volume control and trimmed somewhat by the receivers subwoofer speaker trim adjustment. We are simply trying to ensure the BFD gets an optimum a signal as possible. This means once the trim level is set for the subwoofer out of your receiver, then after that the volume level of the sub is best adjusted with the subwoofers own amplifier (as opposed to touching the trim again).

So, bypass the BFD (IN/OUT GREEN LED flashing and leave it that way for now) and setup your speaker levels with the receivers test tones (including the sub trim and subwoofer amps volume) as you normally would do.
Then put in a bass heavy movie and turn it up to the loudest you would ever use the system. If the BFD LED's are clipping in the RED, then turn the subwoofer trim down and turn up the sub amp to compensate. If the LEDs are not clipping, then turn up the trim to get the yellow LED on and turn down the sub amp to compensate.
There, now the sub trim is set for your system. Don't touch it again. The subs level will now be contolled by the sub amp volume.
You can put the BFD back on with the IN/OUT GREEN LED ON for filters engaged or OFF for filters disengaged. The flashing Green LED is filters off and the VU meters monitoring the input as opposed to the output level.

brucek


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