MiniDSP Releases New Room Correction Solutions with Dirac Live (DDRC-22A and DDRC-22D_ - Page 7 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #61 of 66 Old 12-14-15, 10:51 PM
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Re: MiniDSP Releases New Room Correction Solutions with Dirac Live (DDRC-22A and DDRC-22D_

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Kal Rubinson wrote: View Post
I do not know but suggest you ask miniDSP.
Will do, Kal - thanks.

Andy
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post #62 of 66 Old 12-15-15, 09:38 AM
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Re: MiniDSP Releases New Room Correction Solutions with Dirac Live (DDRC-22A and DDRC-22D_

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andyr wrote: View Post
Kal, although I have used analogue active XOs for about 15 years, I am a digital newbie. I am being inducted into digital XOs and DSP since I am shortly going to take delivery of a pair of custom 15" subs. Having read a few pages of this thread - and gone off to explore the miniDSP/Dirac site - I understand you are a guru in these matters and would be grateful if you could tell me what delay the DDRC-88a can deliver (as I can't see this defined in the User Manual! ).

I am told by my sub builder that the miniDSP 2x4 unit only goes up to 7 millisecs delay ... which may not be enough in my room, due to the position of my main speakers (Maggies) and the subs. If I need more, I am hoping that another miniDSP product can deliver this ... but which one!

Thanks,

Andy
Quote:
Kal Rubinson wrote: View Post
I do not know but suggest you ask miniDSP.
I had asked the Dirac guys at a trade show about the total latency incurred by the correction process and it was suggested the delay range was typically 7-10ms. I haven't verified that, but will in the coming months with a few setups I'm doing, including one using 2 DDRC-88a's for an Atmos system. What you are asking about is the maximum difference between the near and far speaker. That's a good question worth checking into. The hardware is similar to the 10x10HD which does offer up to 15ms. It is an interesting question to see what range of max-min speaker distance difference the DDRC-88a can accommodate automatically. I'll have to look into that further.

That said, in most installations, the upstream preamp could always add additional delay offset if needed.

Mark Seaton
"Make no little plans; they have no magic to stir men's blood..." - Daniel H. Burnham

Last edited by Mark Seaton; 12-15-15 at 09:45 AM.
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post #63 of 66 Old 12-16-15, 08:49 AM
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Re: MiniDSP Releases New Room Correction Solutions with Dirac Live (DDRC-22A and DDRC-22D_

The PC version of Dirac Live can give up to +20 mS of delay on any given channel (minimum is 0, no "negative delay" is possible). One cannot see or change the channel delay settings in the DDRC series of processors. The max amount available will depend on a number of hardware and software factors. It does now show up in the specs anywhere.

I will try to get info from miniDSP.
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post #64 of 66 Old 12-16-15, 11:32 AM
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Re: MiniDSP Releases New Room Correction Solutions with Dirac Live (DDRC-22A and DDRC-22D_

Hi Wayne, Mark and Andy... ciao Kal
the latency introduced by the Dirac Live correction can be determined exactly by looking at the Dirac's impulse response graphs... it's the distance in milliseconds between the "before" and "after" pulses (in maximum performance mode it's considerably less than expected thanks to a patented FIR+IIR solution)

Flavio


Warning: I may be biased even if in good faith, I work for Dirac Research :-)

Last edited by Flak; 12-16-15 at 11:55 AM.
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post #65 of 66 Old 12-16-15, 11:55 PM
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Re: MiniDSP Releases New Room Correction Solutions with Dirac Live (DDRC-22A and DDRC-22D_

Thanks, Flak, I forgot about that.
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post #66 of 66 Old 12-17-15, 12:01 AM
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Re: MiniDSP Releases New Room Correction Solutions with Dirac Live (DDRC-22A and DDRC-22D_

Also, from miniDSP:

"There are only 2 versions of Dirac algorithms on our platform
- Stereo @ 96k (DDRC-22 series) = 23mS
- Multichannel @ 48k (DDRC-88/nanoAVR) = 13mS
[Latency]

Maximum per channel delay, we don't know, that's just depending on your setup.. :-) We have more than 3000ms available but I really doubt that Dirac would ever make use of it"
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