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DSP speaker crossover

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mwillems:

--- Quote from: guido310 on September 16, 2013, 10:06:02 am ---Hi, i am trying to configure PEQ for a 5.1 system with fronts biamped using a Lynx AES 16 card and external DAC
I would like to have 2.1 when playng stereo, but when i configure speakers with LPF and HPF for fronts i loose all the bass frequencies that have to be routed to subwoofer
Here my config

16 channel configuration
Jrss mixing with 2.1 option check
Silent
PEQ:
Copy channel 1 (front left) to channel 9 (low end of front L)
Copy channel 2 (front right) to channel 10 (low end of front R)
LPF on channel 9 FROM 80 TO 500
LPF on channel 10 FROM 80 TO 500
HPF on channel 1 FROM 500 TO ABOVE
HPF on channel 2 FROM 500 TO ABOVE

ROOM CORRECTION TO ROUTE BASS TO SUBWOOFER FROM ALL SPEAKERS AT 80 HZ

I had to use channels 9 and 10 because if i try to copy on 7 and 8 (RL and RR i don't have) i got no sound on these channels, and if i order channel i have sound from channels 5 and 6, my surround speakers...is there a problem with AES 16 card routing??

Anyway, since now channels 1 and 2 are cut at 500 hz, i have no sound from subwoofer when plaiyng 2.1 (cut at 80 in room correction)

I had to copy again channels 1 and 2 to channels 11 and 12 before appling HPF and LPF and than tell to the Lynx mixer to play that from 1 and 2, so i have bass frequencies to route to sub when playing 2.1...but i think this is not the proper way to do that...

Any advice?


--- End quote ---

I also bi-amp and bass routing can be tricky, here are two solutions:

1) If you apply the LPF to 1 and 2 and the HPF to 9 and 10 (instead of the way you're currently doing it), channels 1 and 2 will have the bass for room correction to re-route.

2)  I don't use room correction for stereo bass routing, I just copy the left channel to the sub and then add a copy of the right channel to the sub channel and apply an appropriate LPF to the sub channel when I'm done.  

Also, I suspect the reason that you can't access channels 7 and 8 in JRiver is that 2.1 output format only outputs six channels (three of them silent).  If you want access to the seventh and eight channels in JRiver, you'll need to use an output format like "stereo in a 7.1 container" or similar.  

sorepinky:
It is unclear how to apply the DSP Studio "Linkwitz-Riley filter".  It does not seem to present the necessary input fields.  Like whether you are applying the LP side of it or the HP side, or the slope of it.  Although LR24 is common, there is also LR48.  All it gives you is a frequency.  It seems to operate as an HP, but keying in certain numbers causes an apparent crash of the audio engine and then media server must be restarted.

mwillems:

--- Quote from: sorepinky on June 18, 2016, 01:23:58 am ---It is unclear how to apply the DSP Studio "Linkwitz-Riley filter".  It does not seem to present the necessary input fields.  Like whether you are applying the LP side of it or the HP side, or the slope of it.  Although LR24 is common, there is also LR48.  All it gives you is a frequency.  It seems to operate as an HP, but keying in certain numbers causes an apparent crash of the audio engine and then media server must be restarted.

--- End quote ---

The standalone Linkwitz-Riley filter isn't fully implemented; my advice is to cascade two butterworth filters of the appropriate order instead. The plain high pass and low pass filters are butterworths, so, for example, stacking two butterworth 12 low passes at the same frequency makes an LR24 low pass, two butterworth 24's make an LR 48, etc.

charles0322:
Incredibly interesting thread. I am trying to wrap my head around this and will download the program to experiment with my current soundcard.

I am building a 4way stereo system and was planning to buy an Ashly Protea 4.8sp for about 1000$ to do all my routing for crossover slopes and amp sends.

I was looking around and found the Clarett 8 pre for much less than the Ashly.

I use a mac book pro with thunderbolt and really like the specs of the Clarett.

Is there any video tutorial of menus and settings for Media Center /JRiver?

Thanks!

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