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#92275 - 01/05/13 07:36 PM Re: Model 975 Shipments [Re: XenonMan]
srrndhound Offline
Gunslinger

Registered: 03/20/10
Posts: 51
Originally Posted By: XenonMan
In reading the manual on page 36 it seems that the 975 has some sort of limiter at "0" db where even if you increase the trim the max volume decreases the same amount.
There is no limiter. The volume and trim controls are performed in the same volume control chip (as is the case with most AV processors). The maximum output happens at 0 dB. If a trim control asks for 6 dB gain, it takes 6 dB away from the volume range on all the channels so the total in the +6 channel remains 0 dB thru the volume IC.

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#92278 - 01/06/13 03:27 PM Re: Model 975 Shipments [Re: Scott]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2676
Loc: Columbus,North Carolina
So... If one channel is boosted significantly it could affect the max output of the whole 975? I guess I haven't run into this before because I haven't boosted any channel significant enough to affect overall volume. I don't suppose it would function in the opposite direction if you cut a channel significantly would it boost overall output?
_________________________
Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner

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#92282 - 01/06/13 10:58 PM Re: Model 975 Shipments [Re: XenonMan]
srrndhound Offline
Gunslinger

Registered: 03/20/10
Posts: 51
Originally Posted By: XenonMan
So... If one channel is boosted significantly it could affect the max output of the whole 975?
No. Let's say you ran the test noise and all but one channel came out at 75 dB, and one was 70 dB. You have two choices: a) raise the gain 5 dB on one channel, or b) lower the gain 5 dB on all the others. Either way they all match.

However, the volume control display does not represent the same playback loudness in both cases. In case a) a given volume setting will be 5 dB louder than it will be in case b). No matter, it's only numbers. And when you crank the volume to max, it will stop at "-5" on case a) and at "0" in base b). But the SPL will be the same in both cases.

Quote:
I don't suppose it would function in the opposite direction if you cut a channel significantly would it boost overall output?
Not if the reason for the cut is to bring speakers into balance with at least one speaker at trim = 0 or greater. But if you set all the trims to -10, then you will reduce max volume 10 dB because the system will only go up to 0 and stop, rather than go up to +10.

So if anyone is applying attenuation to every speaker to balance the system, that will reduce max volume. Best to increase all of them by the same amount, until at least one speaker trim is at 0.

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