Originally Posted by Mathelo
I have to assume you aren't using Audyssey in this process. When I calibrate with Audyssey it forces me to adjust the amp gain to the 75db level before it will advance. This puts the amp at about 50% gain (18/32 on the EP4000) and my Denon 4810CI with Audyssey engaged is at 2.5+.
This is also passing through a QSC 30 with the input sensitivity set at 4.0 volts (I think).
Does this look okay to you or should I be looking for a way to get the processor output down below 0?
Your assumption is correct; I have not tuned a room using Audessey in the signal chain.
I also had the QSC 30's sensitivity level set to 4v and this allowed the gain on the Behringer 2500 to be set near max, based upon the output level of the processor. With the QSC 30, you have the added flexibility to set the gain level in one of its software blocks.
Are you using both the QSC-30 and the Audessey? May I assume that is for the benefits of the Audessey above the subwoofer range?
If so, you can comply with what Audessey dictates, to get the benefits of its algorithm, then measure what it has done for use as a reference in the sub range. After that, proceed with the QSC 30 EQ using the Audessey's results as a reference to improve upon.
Not knocking Audessey but as a hands-on engineer type, I dislike black box/automated systems that limit options (no pun intended). Can you get the benefits you are after in the upper range from Audessey and manually tell it what YOU want it to do down in the sub range?
If not, I would do the EQ for the sub FIRST using the QSC 30, using whatever gain structure (amp gain - QSC gain - MV of processor at reference) allows the amp's gain to be near its upper end and THEN leaving the amp gain alone and the QSC 30 in the signal chain, just set the gain down in the QSC 30, if necessary to get to 75dB to make Audessey happy during its calibration of the upper range as a second step. If the Audessey algorithm is sophisticated enough AND you have done a good job with your QSC 30 EQ, Audessey SHOULD do much less adjustment to the sub range on top of your EQ, since it will see the flatter room response you have created in the sub and sub-to-main crossover range.
Critical to this is that you place the Audessey mike in the same location
that you optimized as the primary listener position in your QSC 30 EQ.
When Audessey is done and has made the improvements to the upper range that you are looking for, simply go back and turn up the gain block in the QSC 30 to taste, getting as near to the original setting you used during your QSC 30 EQ process as measures well and sounds good to your ears. Or if you don't want a "house curve" or boost, just leave the gain block level in the QSC 30 alone, since you have achieved the goal: the gain control on the amp is nearer to max.
If the main reason for using the Audessey is for sub-to-main integration, personally I would bypass Audessey (after getting a measurement of its best shot at EQ to use as a reference) and utilize the QSC 30 alone. You have complete control (and responsibility
) over the low end EQ.
Again, I have made several assumptions about your goals in this post so take it with a grain of salt. Hope this helps!