The official Theta Owners Thread - Page 319 - AVS Forum | Home Theater Discussions And Reviews
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post #9541 of 9547 Old Yesterday, 01:06 PM
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Originally Posted by stevekale View Post
*** personally, as I have said before, I would like the ability to sweep the front L (or R) plus sub as a 'single speaker' with the chosen crossover settings engaged but this isn't available (and likely will never be) from Dirac. It would save some of the addition necessary (CB slope plus Dirac curve slope) and, more importantly, would smooth the net response of the combined speakers rather than combining the smoothed response of each individual speaker - the net is what we care about and things are never perfectly equalised; one might find you are trying to correct a challenging null in one speaker and a boost in the other when actually the two would net naturally.
This creates its own set of problems; I tried this with Acourate and it didn't work very well for a system with mono subs. The issue I had is that while it created a great result for the left speaker + mono subs, and, a great result for the right speaker + mono sub, the result with mono material was not very good as the Left and Right correction filters "worked against" each other. Since most lower frequency material tends to be more monophonic than discrete L or R, the end result was not very satisfying in practice. In my system, I get better results with separate corrections for the L, R, and mono subs.
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post #9542 of 9547 Old Yesterday, 01:39 PM
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I think this is confusing/debatable. I would set the final Levels with the crossovers engaged. After all, that's how they will be operating. For doing the sweeps and making sure the volume is in the required sweet spot for DL sweep/measurement the speakers need to be set to Full. Having said that, I suspect differences that would result are likely to be tiny given the frequency range of noise sent to mains versus sub for level setting.
I agree with this, set levels to include bass management related rolloff. However an even better way to do it is to abandon the SPL meter and use REW to align the levels through the critical "power" range from 100-500Hz. If you do that it doesn't matter if bass management is on or off.

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post #9543 of 9547 Old Yesterday, 01:40 PM
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Originally Posted by Brucemck2 View Post
This creates its own set of problems; I tried this with Acourate and it didn't work very well for a system with mono subs. The issue I had is that while it created a great result for the left speaker + mono subs, and, a great result for the right speaker + mono sub, the result with mono material was not very good as the Left and Right correction filters "worked against" each other. Since most lower frequency material tends to be more monophonic than discrete L or R, the end result was not very satisfying in practice. In my system, I get better results with separate corrections for the L, R, and mono subs.
+1.

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post #9544 of 9547 Old Yesterday, 08:46 PM
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Originally Posted by Nyal Mellor View Post
I agree with this, set levels to include bass management related rolloff. However an even better way to do it is to abandon the SPL meter and use REW to align the levels through the critical "power" range from 100-500Hz. If you do that it doesn't matter if bass management is on or off.
Nyal, have you ever calibrated or setup a Theta CB SSP system? The Theta manual instructs calibrating with all speakers set to "Full" and using the subwoofer LFE track as well - and Dave (Thezaks) called Theta and was advised this as well.

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post #9545 of 9547 Old Yesterday, 09:37 PM
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Originally Posted by Steve Bruzonsky View Post
Nyal, have you ever calibrated or setup a Theta CB SSP system? The Theta manual instructs calibrating with all speakers set to "Full" and using the subwoofer LFE track as well - and Dave (Thezaks) called Theta and was advised this as well.
Yes, I have calibrated Theta CBs. I'm also HAA Level II certified.


I can totally understand why the Theta manual says what it says. It makes complete sense, and most people only have an SPL meter. However for the "uber geeks" at AVS and people into more advanced DIY calibration, there is a level beyond just using pink noise and an SPL meter. If you can work REW then you can get more data on what is going on, and with that data make better decisions on setup. The only time I use an SPL meter is if I need to calibrate the absolute levels in REW. Otherwise it stays in the calibration Pelican wheely case!


For speaker level matching I recommend focusing on the 100-500Hz range. Take a measurement with REW, 1/1 smooth it, then look at the relative SPLs. Adjust from there. Most pre-pros and AVRs use band limited pink noise however I feel that the band limited signal is not optimal, as it generally covers a range which isn't that important. These are my opinions; we have better tools than C weighted SPL meters now, so I prefer using them.


For matching speaker to sub level, focus on the crossover range to the speakers, and ensure that there are no obvious discontinuities. There's a lot of latitude with sub level, as many prefer a boost to the sub. I think it's preferable to do this via a target curve EQ rather than level set, as that way you have continuity from the bass managed speakers to the sub, rather than a big discontinuity with all the bass coming out of the sub +6dB hotter (I had one client who liked the sub set at +20dB....).


With Dirac Live you need to run the level set again at the end, as Dirac makes EQ adjustments that may require small tweaks to the levels.

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post #9546 of 9547 Old Yesterday, 11:20 PM
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Originally Posted by Nyal Mellor View Post
Yes, I have calibrated Theta CBs. I'm also HAA Level II certified.


I can totally understand why the Theta manual says what it says. It makes complete sense, and most people only have an SPL meter. However for the "uber geeks" at AVS and people into more advanced DIY calibration, there is a level beyond just using pink noise and an SPL meter. If you can work REW then you can get more data on what is going on, and with that data make better decisions on setup. The only time I use an SPL meter is if I need to calibrate the absolute levels in REW. Otherwise it stays in the calibration Pelican wheely case!


For speaker level matching I recommend focusing on the 100-500Hz range. Take a measurement with REW, 1/1 smooth it, then look at the relative SPLs. Adjust from there. Most pre-pros and AVRs use band limited pink noise however I feel that the band limited signal is not optimal, as it generally covers a range which isn't that important. These are my opinions; we have better tools than C weighted SPL meters now, so I prefer using them.


For matching speaker to sub level, focus on the crossover range to the speakers, and ensure that there are no obvious discontinuities. There's a lot of latitude with sub level, as many prefer a boost to the sub. I think it's preferable to do this via a target curve EQ rather than level set, as that way you have continuity from the bass managed speakers to the sub, rather than a big discontinuity with all the bass coming out of the sub +6dB hotter (I had one client who liked the sub set at +20dB....).


With Dirac Live you need to run the level set again at the end, as Dirac makes EQ adjustments that may require small tweaks to the levels.
thanks. Great info!

You mean you don't remember me? Back 1999 - 2003, I started and moderated the AVS Tweaks forum and also the AVS Special Guests forum.

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http://www.avsforum.com/avs-vb/showthread.php?t=1158431
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post #9547 of 9547 Old Today, 12:04 AM
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Even better workflow....just have Nyal come over to do it all for you and get it right! Stuff messing around with all this cr*p...

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