Originally Posted by 2therock
I would be grateful if the experienced MCACC users here would look at the speaker info & specs in my signature and recommend how to make my 1st run at it. Any words on it would be great.
I would start by setting the sub volume no greater than 50% and probably 25-30% is even better. run Auto MCACC and see what the sub channel levels are set. ideally, it should be reasonably close to 0 dB, no large gain or cut. if the level is significantly greater than 0 dB then reduce the sub volume and re-run. if the level is a significantly negative, less than 0, then increase the volume a bit and re-run. having it +- 1 to 2dB is not to bad, but if it's close to the max/mins (+-9 dB) then you can adjust the sub volume accordingly and not make the preamp section boost or cut the level as much.
and even though your speakers have good bass response (I looked at your post info) they are still not in low LFE territory which extends to 20 HZ and even below. some discs have sub-20 output (The Incredibles DVD had measured bass down to 10 Hz or below during some scenes). your sub is much better suited to handle this, IF it's a good sub
setting speakers to Small also reduces the stress on amps trying to reproduce those dynamic sudden low freq effects.
I've run my front Magnepans as Large since they can reproduce to 34-35 HZ and finally took the advice to set them to Small for movies with a Xover of 80 HZ. my Maggies used as surrounds and center are more bass limited and have to be set to Small.
in your case, the fronts are the most capable, but even though your center and surrounds are good, they are not as capable as a subwoofer so IMHO, you should set the surrounds & center to Small, try the fronts both ways and use either 80 (preferable) but no less than 60 HZ as your crossover. I'd still pick 80 because the Xover is not a hard cut-off but a rolled off cut. your surrounds & center will still be handling some of the bass < 80 HZ but their response will be rolled off. Higher than 80, no and not needed.
for music, if your speakers have a particular bass sound that you like, you can try it both ways and see which you prefer. then you can always switch the fronts back & forth from Small to Large and not need to re-run MCACC.
but I would start listening evaluations with 80 HZ Xover, fronts as Large, fronts as Small, but surrounds & center definitely set to Small since they won't go as low as your fronts and definitely not be able to reproduce all the content in the LFE channel (LFE channel freq band being 20-120 Hz and even < 20 depending on the mastering) no "normal" speakers are capable of < 20 HZ and most cannot adequately go to 20 HZ