3 c-ports DSP 2000

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Nijbij

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3 c-ports DSP 2000 users, do you also have this delay??

I'm Peter Nij Bijvank from Holland and I'm also an owner of 3 c-port cards, I try to use them in my studio but I think there is still something wrong with this product (or the driver).
I've got a P4 with a soyo dragon ultra mobo with raid and two 80 G hd's. (I also tried a similar board from ASUS p4b533e)
For software I use Steinberg Nuendo or Cooledit pro 2.1
I posted a message on the forum some months ago and Skinnah (Matt) reacted on this and together we now try to find out where the problem is.
Could anyone please try this for me on their system: apply the same 1 Khz signal (with Y-splitter or something) to input 1 (first input of first rack) and input 9 (first input of second rack), now mix them together after recording. You'll notice the signals do not exactly add up, there is a delay between the first and the second rack (and even more with a third rack of course).
Another thing to try; take a cd player and connect channel L to input 1 and channel R to input 9, now record this and with playback try to make a mono signal out of this. You'll notice Phase-errors.
The three cards all have different timings with every new project you create or will be different with every sample rate you try (especially with higher sample-rates)
With ASIO it can run up to 17 milli seconds(!!)
Suppose you have a drum kit setup in the studio and the symbal microfoons are connected to the second rack.
My conclusion is that I can't do a proper live recording session with this delay.
This is my studio :http://www.fraizle.com/template.php3?prefix=fraizle#pid=30&offset=10 and I did my first CD-production on a loaned RME Hammerfall system built into the pc I mentioned earlier.
I'm very curious about yours and other multiple card users experiences.
 
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Well, I suppose not many (if any) of the people here use a multiple C-2000 configuration. I haven't heard anyone on this board mentioning having such a setup before.
Sorry, I have nothing to add that might help. Good luck.
 
please read my post again,

I reveived lots of e-mails from skinnah and he is working on it.
I'm just interested if anyone else has this problem too.
The one dsp 2000 works fine, it's just the delay between two or more racks that I'm having problems with.
It can run up to 17 mS in asio!!!

by the way, this is the correct link to my studio:
http://www.fraizle.com/template.php3?prefix=fraizle#pid=30&offset=10
 
The typical thing to do with multi-card is to have one card set to master and the other to slave to them. Have one of your card set to internal sync, run coax cable from that digital out to the digital in of the second card, make that external sync. run coax from digital out of that card to digital out of the third card and set that one to external as well...

That's my guess...
 
Thanks for replying and the suggestions.
I've done this, all cards have external sync connected and are configured to use it that way.
I even connect a video-aes reference generator with a 96 Khz sample rate to the first interface.
It's not that the cards run off from each other, they are perfectly in sync with the reference signal you connect to it.
When you're working on a project, the delay will not change unless you for example disconnect and connect the reference again.
I'm a senior support engineer at the dutch broadcast company called NOB in Hilversum, believe me, I know about referencing signals...
The delay is acknowledged by Skinnah (staudio forum), he's working on it, I'm just looking for experiences of other people.
 
You know what? Now that I think about it, it sounds exactly like the problem that was caused in multi-channel M-audio Deltas recording in earlier driver revisions. I think this is worth pointing out. The C-port and the Deltas use the same Envy24 chip and the drivers are so similar that for a long time, it was recommended to use the STAudio drivers on Delta cards as a last resort. I wonder if you might want to try the reverse?

Worth a shot, eh?
 
sure it's worth a shot, pitty I'm selling the stuff right now, I'm fed up with it.
I once suggested to Skinnah to use 3rd party drivers, he mentioned Delta, I wish I'd tried them at that time.
doesn't matter, I'm going to buy some Hammerfall stuff, at least that has quality, I know because I used this system producing my latest CD.
The staudio stuff is ment to be pro, it's consumer!
the input stages are done with TL082 opamps, one step higher then the opamp that is used in most of the consumer equipment
Then there is a little transformer in the microfon input, TOO little to work properly (ringing, low frequency respons etc.)
The line inputs are fed unbalanced into the A/D converter, the actual output of the D/A is balanced!! Then Hoontech decides to make it unbalanced again with more components.....
If I want to record live events, god knows what equipment is on stage, with hoontech there is a big datakabel, with adat (hammerfall) there is an optical connection so no risc for damaging my expensive computer and cards.
I attached a small drawing of the signal path (line-in and out) for one channel (channel 1 with un- and balanced output) within the hoontech interface also.
 

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Nijbij said:
doesn't matter, I'm going to buy some Hammerfall stuff, at least that has quality
Click to expand...

That's exactly what I'm doing. I'm so tired of the C-Port hassle. If it were stellar I might put up with it, but to my ears it's rather so-so. I'm loosing my C-Port and picking up a Multiface/PCI. See you on the other side. ;)
 
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