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Old 4th January 2013, 11:07 AM   #391
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Quote:
Originally Posted by Esperado View Post
How can-you EQ a horn slope ? Better use-it, no ?
As long as the system is minimum phase it should work, although you would need a lot of gain (which is probably knocked down again by the XO). But I am by no means an expert on horn systems. Should be an interesting thing to try!
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Old 4th January 2013, 02:05 PM   #392
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If I were to implement an analog crossover (active or passive) I would use the driver's natural response as part of the transfer function.
If I would implement a customised digital crossover I would also include the driver's response into the transfer function.
If I were to use a turnkey solution like the Hypex crossover(s) then the easiest way is definitely EQing it flat and using a "texbook" crossover.

If you want to do this with reasonable accuracy then there is no way around measuring the horn's response. If there is no EQ function allowing an accurate compensation of the amplitude response then go for the one that gives the most accurate phase response. It is usually the phase response beyond the crossover frequency that influences the summed amplitude response the most.

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Charles
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Old 9th January 2013, 05:55 AM   #393
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Complete n00b here, wondering:

1. Has this progressed to the point where it could replace a passive crossover in an arbitrary speaker (say a B&W 801 Matrix Series 3) with an added (rented reference) microphone and computer (assuming no additional phase or room correction)?

2. As a pure DAC, is it comparable to existing consumer ones (say a Musical Fidelity M1a DAC)?

3. Assuming all digital input, is it possible/practical to compensate for phase problems offline, by statically pre-processing the files in advance? I played with Sox a long time ago, but I'm sure there are better options now.

I also used an NAD 118 a long time ago, and I always associate SHARC with lots of noise and distortion as a result. It did have a nice expander, though. Not sure if there's anything like it on this, or decent algorithm in the public domain.

I'm looking to build an NC400 and stumbled across this. The DLCP looks like it would make a nice integrated amplifier in combination, although its close enough to the edge to make me wonder if I'd end up with more than bloody fingers for trying.

Thanks,
Mark
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Old 9th January 2013, 05:18 PM   #394
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Quote:
Originally Posted by markgwoodruff View Post
3. Assuming all digital input, is it possible/practical to compensate for phase problems offline, by statically pre-processing the files in advance? I played with Sox a long time ago, but I'm sure there are better options now.
possible yes, practical... not so much as you need to process all your files, and find a way to keep your metadata (FLAC) in the process.

What media player software are you using?
Most of them have plugins that can do convolutions. I would not use a PC for a complete active filtering solution (for both practicality and reliability), but for doing only phase linearization and/or minor addtional EQ I think those plugins embedded in a mediaplayer do the job quite nicely.

Last edited by pos; 9th January 2013 at 05:21 PM.
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Old 9th January 2013, 07:50 PM   #395
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Logitech SqueezeBox SB3 player, Win7 box with 8 cores and 32gb of memory. To really do it right, I think you'd need at least 80 bit floating point precision to keep 20 to 24 bit resolution all the way down the line, which is tough to do in real time, but easy to do offline: just process all the files and store them on the music server.

Going from Flac to a raw word stream, to a reversed stream, filtering and mixing the two, and back to Flac is pretty easy with sox. I don't have the scripts to do it any more, but it wasn't that hard. Even after recompiling it to use double precision (64 bit) though, I couldn't reverse the process and get back to my original. If I understand it right, that should be possible with all IIR filters and adequate precision.
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Old 9th January 2013, 11:29 PM   #396
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You don't need that much precision for a convolution (even with an FFT convolution).
foobar2000 convolver uses a 32bit float native format, whereas Jriver convolver uses 64bit, but I doubt it makes any difference.
I don't think SoX' offline convolution engine is any better (nor does it need to be).
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Old 10th January 2013, 01:46 AM   #397
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Originally Posted by pos View Post
you need to process all your files, and find a way to keep your metadata (FLAC) in the process
The last SoX build I used was a while back but, if it hasn't been updated to support batch processing and metadata preservation, Cross Time DSP implements most of the necessary bits so far as FLAC goes. No takers yet on the last piece, though.
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Old 14th January 2013, 02:22 AM   #398
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as there is no manual yet I was wondering if anyone can help - does the dlcp filter designer automatically center the response when all driver responses are loaded up ( can't see how it happens) or do you need to rescale the inputs so the desired comparative level sits at 0dB - I am trying to put in measurements taken in praxis

Thanks
Phil
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Old 14th January 2013, 09:43 AM   #399
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AFAIK there is v1.6 on the website, a newer version that ships with DLCPs and an ever newer version on beta test, so functionality is probably not finalized.
Software is a bit of a gray area at the moment and one of the two reasons (second being the lack of input/control boards) I keep postponing my purchase.
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Old 18th January 2013, 04:49 PM   #400
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Any news about the release date for the controller and input board?
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