A how to for a PC XO.

[BlackCatSound]

Originally posted by ewildgoose
Linear phase filters mean that there is no time lag due to the filter.

But doesn't a linear phase FIR filter have a constant phase delay? The delay is non-zero and the phase angle changes with frequency but it changes in a linear way, no lumps or bumps.

[ewildgoose]

Well, I was trying to give a laymans definition, but this is certainly true

Strictly speaking I think we are after zero phase filters here, which are a subset of linear phase filters. People seem to use zero phase and linear phase interchangeably, but of course this is not quite correct

Ed W

[ShinOBIWAN]

Originally posted by ewildgoose
[B]Shin, no doubt the Fireface is incrementally better spec'd than the 9632, but you need to compare both in a listening test, the specs are not the whole story. I doubt there is so much difference in practice and the fireface is basically their 8 way DAC with a firewire input I think?

I agree Ed.

I have however compared the Lynx/Apogee to the 9632 and then the fireface to the Lynx/Apogee. So I've got points of reference for performance. My thoughts on the 9632 vs. Lynx/Apogee were posted earlier in this thread.

I was looking at the 8-way ADC/DAC when I bought the Apogee. Its DAC's are spec'd somewhat similar to the 9632 with 112dBA SNR etc., although its ADC section is superb with 117dBA SNR. Seems to me that the RME ADI-8 is around 5 years old and getting on now. Newer DAC's like the AKM's top of the line AK4396 in the fireface have since appeared with 119dBA SNR etc.

Bottom line is: There's a very definite improvement from RME9632 -> Lynx/Apogee but from that to the fireface there's little difference between them, though I'd give the edge to the Lynx/Apogee setup with a slighty more focused sound.

[ShinOBIWAN]

double post

[geofstro]

Ed,

From what you are saying it would be definately worth my while employing a linear phase filter(s) between my mains and subwoofer.

Shin,

If I buy the Fireface I will be able to use console and Waves or the free LP equalizer to do this, right?

The only part I didn`t understand is the RTA (real time analysis) part.

Does this involve employing a mic and some additional software to measure the result of the crossover filter(s) you`ve created? If so, could you please explain the software required and the exact procedure?

Thanks

geoff

[dwk123]

Originally posted by ShinOBIWAN
Geoff,

Console won't work with your EMU card or at least it won't do what you need. The reason for this is that you have no internal loopback function on this card.

Whoa! I don't believe this is correct. The EMU DOES have multi-client drivers that should work with console, as long as the playback client uses the waveout device. ie the waveout I/O is simply another strip in PatchMix , and can be routed to an ASIO input or to a physical output. You can't have multiple ASIO clients, but I believe that is a somewhat common limitation.
There are some limitations in how they implemented multi-channel waveout drivers but for simple stereo it should work fine.

[ShinOBIWAN]

Originally posted by dwk123


Whoa! I don't believe this is correct. The EMU DOES have multi-client drivers that should work with console, as long as the playback client uses the waveout device. ie the waveout I/O is simply another strip in PatchMix , and can be routed to an ASIO input or to a physical output. You can't have multiple ASIO clients, but I believe that is a somewhat common limitation.
There are some limitations in how they implemented multi-channel waveout drivers but for simple stereo it should work fine.

Very sorry if I gave the wrong impression. I was going with another user reporting that they couldn't get an EMU card to do what is required with console for DRC/XO.

The best thing to do Geoff is to download the trial of Console and try routing audio from foobar, winamp etc. through it and see if it will actually pick it up by using the level meters within console. If it works your all set to go, if not then my original comments stand.

Can someone please confirm if the EMU cards work and if so I can add them into the list of compatibles.

[ShinOBIWAN]

Originally posted by geofstro
Ed,

From what you are saying it would be definately worth my while employing a linear phase filter(s) between my mains and subwoofer.

Shin,

If I buy the Fireface I will be able to use console and Waves or the free LP equalizer to do this, right?

The only part I didn`t understand is the RTA (real time analysis) part.

Does this involve employing a mic and some additional software to measure the result of the crossover filter(s) you`ve created? If so, could you please explain the software required and the exact procedure?

Thanks

geoff

Are you referring to generating DRC filters or analysing your loudspeaker response for XO setup?

[dwk123]

Originally posted by ShinOBIWAN


Very sorry if I gave the wrong impression. I was going with another user reporting that they couldn't get an EMU card to do what is required with console for DRC/XO.

Well, the Emu PatchMix app isn't the most intuitive thing in the world, so it's possible there was simple confusion. It's also possible that 'simple' multi-client functionality isn't quite enough for Console.

The best thing to do Geoff is to download the trial of Console and try routing audio from foobar, winamp etc. through it and see if it will actually pick it up by using the level meters within console. If it works your all set to go, if not then my original comments stand.

Can someone please confirm if the EMU cards work and if so I can add them into the list of compatibles.

I've been meaning to do this, and will try to do so soon-ish. My multichannel/xo/drc efforts stalled a while back when I unexpectedly ended up with a very good set of off-the-shelf speakers and spent some time getting a 'normal' 2-channel system going. I have a new target for my DIY 3/4-ways, though, so I'll try to find some time to explore the capabilities of the Emu card (I have an 1820M, but all the cards use the same drivers)

[ShinOBIWAN]

Thanks dwk,

If you get it to work, I'll add it to the list and that will certainly open up another price point for others interested.