The Audyssey Pro Installer Kit Thread (FAQ in post #1) - Page 3

Wow, I hadn't noticed that. Are you breaking the "If it says -12, turn those damn subs down and rerun autosetup!" rule?



Still tryin to upload my certs...

I am not taking one side or the other on this but just reporting my efforts to learn more and get better SQ.

I just called Luke back and questioned him on this issue again. He patiently clarified that Audyssey filters operate in a +9/-15 range. So sub channel trims near the extremes can limit how much Audyssey can do to cut the room peaks and thus flatten the overall response. In my case, I have huge peaks at 40 and 50 Hz in the room and with the sub channel trim of -10.5 the full needed correction could not be applied. This was negatively affecting the result. OTOH Luke says they do not want people needlessly chasing "0" trim but he likes +/-3 as a good general target. Interestingly, IME prior to Pro, my impresssion (no measurements, mind you) was that it actually sounded better to me when I got the sub trim closer to 0 vs -10. I'd attributed it to placebo.

irt Council's results, a couple of questions come to mind. Council, are you sure -12 is proper trim so you do have reference-level bass? Had you done any recent calibrations (without the Behringer DC with sub ch trim at less neg than -3?

Hi again counsil. I am a bit out of my depth but my question had to do with the possibility that the poor XT32 results you were getting without the Behringer might have improved with lower sub levels.

It also looks to me per your subs "Before" response that your setup required much less correction than mine. I wonder if dialing in time alignment with the Behringer might have improved overall response in the room- do you have a pre-Behringer cert to compare to?

I'm still unsuccessful at getting my cute-generated pdf to upload. You posted your graph in the body of your post. How do you do that?

A "Luke tip": One can optimize the speakers, subs, acoustic treatments, etc. using the Pro kit by comparing the "Before" graphs from successive runs.

To make things go faster for subs, I unselected all but FR/L and CC, ran only 3 mic positions before calculating, then just viewed "Draft" results without loading the filters to the AVR. That went pretty quickly.

Of course the Audyssey cert AFTER graphs are not real measurements. I'm trying to get more adept with the OmniMic system. But my OmniMic graphs do not sync well with Audyssey before OR after graphs so I'm messing up somewhere.

But I really need to focus on getting more day job work done and then still have some time at the end of the day to enjoy this great-sounding HT!

Yes, but averaging 3-5 measurements over a 4 sq ft area around MLP doesn't seem to make much difference to the curves.

I focused mostly on the subs and the response up to 200 Hz. I stretched out the FR screen so I could see more detail in the low freqs. The Omni "no Audyssey" graph shows a peak at 70 and 100, a dip between them and another at 120, about 10 dB variance overall. The "Audyssey engaged" graph looks MUCH flatter, within +/1 2dB except for a peak at 48-52 Hz of 4dB. Not bad, really. Averaging does not appear to be an option with the OmniMic Bass Decay screen

For my last calibration, with subs at -6.5, the Audyssey Certificate Subs curve initially showed about +/-1dB flat all the way till roll offs at the ends below 20 and above 120or so. I may not have finalized that properly as I was taking the wife to dinner and in a hurry. I later had a problem getting that file to upload to the A website so I recalled it on the laptop and recalculated it without adding any new mic positions. Strangely, it now shows a 2dB bump below 30 Hz, then the rolloff. But not bad at all, much better than the results with subs at -10.5 and even -9.5. Still trying to post graphs....

Yea! Jeff has kindly offered to host the recalcitrant pdf files:

http://www.peparsplace.com/storage/C...substoohot.pdf

http://www.peparsplace.com/storage/7_1240HzCert.pdf

Yes indeed, so there goes my little hypothesis. The Audyssey Subs After curve looks really great though, about as impressive as your more current graph with the Behringer in place.

So this takes us back to whether the Audyssey After curves are accurate. Sorry if I missed this, but has there been an audible improvement with the Behringer in place that correlates with the better XTZ curves?

Hi Markus. I am a total newb with OmniMic and it has more features than I know how to use. If I understand your question, yes OmniMic can do averages from a single speaker. Also see my response to audioguy's question just a few posts up. I have been most focused on the averaged curves for the 2 subs together from both Pro and Omni.

No I did not post the OmniMic graphs, not sure I saved them properly but i sketched them and took notes so that is what I reported here. I do not understand the time-align stuff. I used the technique I described above, sampling a 3-5 spots in a relatively small area and using the summation feature in the OmniMic software for the combined curve. For a full Pro calibration I use a slightly larger area (almost 9 feet sq) and 8 positions. OOps gotta go to work...

OK, Markus, but as I said, I'm a newb to OmniMic. Clarification: when I say, "I do not understand the time-align stuff," I'm not politely disagreeing. I mean I have no clue what you mean, why it's true or how to do it.

^Hmmm...Here's what I understand on the topic, which may seem fairly basic, so I apologize to those with a more sophisticated understanding. Feel free to correct me if necessary and further educate me where possible.

Distances (delay) of multiple speakers can only be correct at one spot, with Audyssey or without. That spot, referred to as MLP, is mic pos #1 for Audyssey.

On the topic of using systems for measurements, it has been repeatedly stated by Chris (audyssey) that to more accurately measure what Audyssey is doing, one needs to take multiple measurements at the same mic positions used for Audyssey. There was no mention of time alignment.

I have posted that for OmniMic I used a small grid, less than 2'X2' and for Audyssey I use a slightly larger one, maybe 3'X3'.