Thanks for the input, I have some progress.
I've rewired the CS8420 for slave/slave operation and plugged the USB adapter through I2s ( instructions http://www.diyaudio.com/forums/digi...chronous-usb-i2s-interface-9.html#post2721838 ). Sync issues are gone now, it works perfectly at all sampling rates, any volume. However, the clicks are still present, although not as harsh (very short HF chirp instead of loud pop and some 100ms of silence). Also, they don't seem to trigger the CS8420 bug anymore.
I've rewired the CS8420 for slave/slave operation and plugged the USB adapter through I2s ( instructions http://www.diyaudio.com/forums/digi...chronous-usb-i2s-interface-9.html#post2721838 ). Sync issues are gone now, it works perfectly at all sampling rates, any volume. However, the clicks are still present, although not as harsh (very short HF chirp instead of loud pop and some 100ms of silence). Also, they don't seem to trigger the CS8420 bug anymore.
Thanks, I found it, starting on post #3363 onwards. Nice mod, it's nice the way you can get the signal before it gets to the onboard DAC's, that way you don't have to solder to the legs of the onboard DAC's. I'm tempted to try TOSLINK outputs also, but one thing at a time I think, I'll check out what parts are needed before getting the soldering iron out.
My modded DCX2496 (Jan output board, Oettle SRC & clock, Jan linear psu) rests in the attic since I got a DEQX PDC-2.6P (with DEQX upgrade) about three years ago.
Speaker correction and phase linear 96 db/oct filters are great - something DCX2496 can not do.
I never ever had some thoughts about going back to the DCX2496.
hth
Ulli
Tried to find answers to these noobie questions, so excuse me for needing to ask. My application is a tri-amped system.
Like a miniDSP 2x8, can each of the 6 Behringer outputs be configured independently for passband (or are the crossovers the same for both L and R inputs) and for some number of parametric filters? How many filters per output?
And like my unsuccessful search with miniDSP, what are levels of distortion, esp. if they can be compared to the ordinary total harmonic, noise, and such traditional specs?
Thanks.
Ben
Like a miniDSP 2x8, can each of the 6 Behringer outputs be configured independently for passband (or are the crossovers the same for both L and R inputs) and for some number of parametric filters? How many filters per output?
And like my unsuccessful search with miniDSP, what are levels of distortion, esp. if they can be compared to the ordinary total harmonic, noise, and such traditional specs?
Thanks.
Ben
Ben, yes. The DCX can be put into a mode where all 6 channels are independent. Or some parts of them can be linked, if you like. The distortion of the DACs is very low, they are of good quality. However, the analog output is not great. OK below ~1Khz, but HD and IMD rise rapidly above that. The output is also at "pro" level, much hotter than you need for home gear.
First mod is to replace the analog output section. Second mod is to beef up the power supply, at least the analog part. If you use the analog inputs, then replacing that section is well advised.
First mod is to replace the analog output section. Second mod is to beef up the power supply, at least the analog part. If you use the analog inputs, then replacing that section is well advised.
You can choose in the "out-xover points" page the "x-over adjust mode" to either (link) or (free). In (link) the settings for one output are applied to the one linked to it; in (free) each output is set for itself. All six outputs can be either full-range, LP, BP or HP.
OUTPUT CIRCUIT
The DCX output looks like this (see attached).
You should be able to pick up the signal after the 1st opamp (watch out for DC) but I've never tried it.
All you really need is something to block DC out of the DAC chip, a way to go from differential to signal ended, and maybe a little low pass. Passive is OK. I use transformers for this, as they do all of that quite well.
The DCX output looks like this (see attached).
You should be able to pick up the signal after the 1st opamp (watch out for DC) but I've never tried it.
All you really need is something to block DC out of the DAC chip, a way to go from differential to signal ended, and maybe a little low pass. Passive is OK. I use transformers for this, as they do all of that quite well.
