384KHz with SEG over USB?

[Alp]

I have been playing with upsampling to 192Khz in picoreplayer, which sounds very good and uses only a few percent of the CPU. This is over a coax link to the Caiman SEG. I wanted to try-out 384Khz but I have read the SPDIF output from the Allo Digione (and in general?) is limited to 192KHz. I reconfigured picoreplayer to use USB out put. That works fine to 192KHz but silence at 384KHz. I also tried feeding-in an upsampled WAV file - still slilence.

Is there an inherent limitation in the SEG (it is supposed to go up to double this) or could it be the USB cable I am using or am I simply doing something wrong?

[StanleyB]

192kHz is the best that you'll manage via the USB.

[Alp]

Thanks that explains it. Are higher rates possible via the coax and optical S/PDIF (assuming I had a card that is also not limited?).

[StanleyB]

192kHz is the limit. I am not into trying to cater for every possible combination of formats and frequencies ever devised. I am only really interested in the sound quality.

[Sherwood]

I have been playing with upsampling to 192Khz in picoreplayer, which sounds very good and uses only a few percent of the CPU. This is over a coax link to the Caiman SEG. I wanted to try-out 384Khz but I have read the SPDIF output from the Allo Digione (and in general?) is limited to 192KHz. I reconfigured picoreplayer to use USB out put. That works fine to 192KHz but silence at 384KHz. I also tried feeding-in an upsampled WAV file - still slilence.

Is there an inherent limitation in the SEG (it is supposed to go up to double this) or could it be the USB cable I am using or am I simply doing something wrong?

Alistair,

You have the same front end that I have. Have you tried Audirvana?

I use that to upsample to DSD128 which goes to my Digione and then to the SEG. Sounds superb.

[Alp]

Alistair,

You have the same front end that I have. Have you tried Audirvana?

I use that to up sample to DSD128 which goes to my Digione and then to the SEG. Sounds superb.

As I understand it you have to run Audirvana on a PC/Mac which I could do but don't want to leave a PC or laptop running all the time, which is why I tried up-sampling on the RPI3 (which sounds very good, even at 192 KHz). The data rate for DSD128 is basically the same as 352KHz (1 biut * 5.6448MHz = 16 bits*352KHz), so its interesting that goes first through the Digione and then the SEG unless it is being down-sampled along the way.

[Alp]

192kHz is the limit. I am not into trying to cater for every possible combination of formats and frequencies ever devised. I am only really interested in the sound quality.

On your web-site it says "The current range of high-end consumer DACs chips go up to 32 bit, but only 384kHz oversampling. The Caiman SEG DAC is capable of up to 768kHz performance." Is this therefore accessible purely internally to the DAC?

[StanleyB]

On your web-site it says "The current range of high-end consumer DACs chips go up to 32 bit, but only 384kHz oversampling. The Caiman SEG DAC is capable of up to 768kHz performance." Is this therefore accessible purely internally to the DAC?
The DAC does oversampling. That doesn't mean that it accept incoming frequencies of that size.