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Bitstrom 4th November 2007 04:43 PM

Fully digital crossover
 
I'm looking for a digital crossover that doesn't include AD and DA conversion and works up to 192kHz with 24bit.

What I want to achive is to connect the digital out on a soundcard to an external XO unit and get up to 4 filtered digital signals per channel that I can connect to separate dac's.

The optimal would be if it could be programed from a PC.

If anybody know of such an XO or feel capable to accept the challenge to construct one that can fit for DIY please let me know.

threefff 6th November 2007 11:42 AM

Hi Bitstrom,

take a look at this:
www.acourate.com

I am still checking it out, but at least it works!
All you need is a PC, their Linux on a stick and a soundcard.
I use a M-Audio 1010LT, so I have digital Input, but 8 analog outputs.

You could go and utilize the I2C inputs of the DACs, or prefereably a soundcard with digital (SP/DIF) outs (RME Hammerfall, for instance).

Best wishes
Thomas

Thunau 6th November 2007 12:20 PM

http://www.thuneau.com/alloclite.htm
http://www.thuneau.com/allocator.htm

Just use a RME or a MOTU sound card with AES/EBU outputs and connect your favorite DA converters.

ttan98 6th November 2007 12:43 PM

Re: Fully digital crossover
 
Quote:

Originally posted by Bitstrom
I'm looking for a digital crossover that doesn't include AD and DA conversion and works up to 192kHz with 24bit.

What I want to achive is to connect the digital out on a soundcard to an external XO unit and get up to 4 filtered digital signals per channel that I can connect to separate dac's.

The optimal would be if it could be programed from a PC.

If anybody know of such an XO or feel capable to accept the challenge to construct one that can fit for DIY please let me know.


I just bought a x-over, Behringer, DCX2496, you can download x-over data from PC via s/w Soundeasy. this is a desk top unit. not pc mounted.

M-Audio has a few models, which is mounted on the PC I think you can download x-over data from the PC. M-Audio is proven to be very good product and used by many audio enthusiasts.

AndrewT 6th November 2007 12:48 PM

Hi,
the Behringer DCX2496 accepts an AES digital input and processes at 96ks/S to 24bits.
It then converts to analogue for the outputs.

Bitstrom 7th November 2007 11:05 AM

Thank you all
 
My intention was to find a solotion that is not using a multichannel soundcard.

Except from the 192 kHz ability the dcx2496 tweaked with digital outputs is what comes closest to what I want to achive. But I read somewhere that the behringer emulates analog filters and therefore introduces phase shift into the signal.

But anyhow, thank you guys for trying to help.

Maybe I will eventually go for a dedicated pc with multiple soundcards since it seems to be a relatively cheap solution (depending on the software prices) for a to get a really high performing system.

dwk123 7th November 2007 02:04 PM

Re: Thank you all
 
Quote:

Originally posted by Bitstrom
My intention was to find a solotion that is not using a multichannel soundcard.


Why? If you're planning on using the PC as a source anyway, it seems like a natural avenue to explore.

Quote:


Except from the 192 kHz ability the dcx2496 tweaked with digital outputs is what comes closest to what I want to achive. But I read somewhere that the behringer emulates analog filters and therefore introduces phase shift into the signal.

It sounds like the DEQX PDC is close to what you're looking for, although it's 3-way only and probably limited to 96kHz. It has digital inputs and optional digital outputs, and isn't limited to strictly IIR filters. Not cheap, though.


Quote:


Maybe I will eventually go for a dedicated pc with multiple soundcards since it seems to be a relatively cheap solution (depending on the software prices) for a to get a really high performing system.

You want to avoid a multi-channel card, but would consider using multiple 2-channel cards? The short answer is "don't bother". Achieving sync across multiple cards is a pointless exercise in frustration given that very good multichannel cards are available for very modest prices.

Since what you're looking for doesn't exist, and you seem to find the 'obvious' approach unattractive, you might look at peufeu's ethernet-to-i2s-via-fpga project. He was away for a while and there wasn't much progress on it, but if/when he finishes it it'll be pretty close to what you're looking for.

hjb 7th November 2007 07:14 PM

I had a similar set of requirements which I have found a solution for (still testing, but seems to work).

I wanted to have 2 zones of audio from WMP11 with correction filters applied to each zone. I use DRC to generate correction filters for each zone (i.e. 2 rooms being corercted for).

I have the following setup:

2 x m-audio transit USB -> 2 x DAC-AH -> 2 x Power amps

Then, I use Convolver to apply the filters and to create 4 output channels from 2 input channels (you could apply your XO here).

To connect the 2 devices into a single virtual device, i use Virtual Audio Cable as the sound device in WMP, under ASIO4ALL and use VSTHost to host the ConvolverVST plugin. Then, in VSTHost, i set the device to ASIO4ALL and the input to the 2xVAC channels and the output to the 2x2 m-audio channels (4 channels out). i see no reason why you could not connect any number of output devices in this way. regarding drift, i have not noticed any, but I am feeding to 2 different rooms so is hard to tell. I believe VSTHost has the ability to apply delays to specific channels. I wonder if the fact that I have 2 identical USB audio devices connected to the same powered USB hub alleviates. I'm still experimenting, but wanted to share.

Bitstrom 8th November 2007 07:33 AM

The DEQX PDC looks like a really nice solution, except the price :bawling:. So I guess I will have to wait for a cheaper competitor to appear since this is the evident future of audio reproduction.

About the syncronisation of more then one soundcard I think it is possible to solve with delay settings.

I think "hjb" is having the solution for the time beeing. I have been looking at a similar setup but hoped to find a simpler or at least more integrated way to go. Winamp with some plugins will do the trick, but at the cost of a rather advanced setup.

The sync problem could be an real issue though if it comes to a 2,5 way speaker were I guess it can be important to have the woofers play very close in time.

For now I will go to pray that some big brands to get into this market with sinking prices as a result.

AndrewT 8th November 2007 07:42 AM

Hi Bit,
you've asked for 192ks/S.
What sources have you found that can make use of that?

Some designers are looking at upgrading the DCX2496 to 24192.
This may take a while before they publish.
If you're patient that mod could be forthcoming just as the market starts to think about providing a higher sampling rate.

What is the bit rate in the audio channels of HDTV?


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