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GB thread for XMOS DSD 384 kHz / 32bit USB

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#153
Hi everyone,

I have received my package and I am very satisfied with the combo XMOS + AK4396.

But... I have a problem. I cannot have the board recognized by my late 2012 13" MacBook Pro with OS X 10.9 (Mavericks). This is the error I get:

Code: 
USBF:    195.308    The IOUSBFamily is having trouble enumerating a USB device that has been plugged in.  It will keep retrying.  (Port 1 of Hub at 0x14000000)
USBF:    196.620    The IOUSBFamily gave up enumerating a USB device after 10 retries.  (Port 1 of Hub at 0x14000000)

The same thing happens with my son's Mac. On the contrary, everything works fine if I connect the board through a USB Hub with external power supply.
On a Windows PC I don't have to use the external hub, but the board is recognized also if I connect it directly to the PC USB port.

Is anyone having similar problems? Is anyone using the board with success with a MacBook without having to resort to use an external hub?

Ciao,
Marco
 
#155
macrobo said:
Hi everyone,

I have received my package and I am very satisfied with the combo XMOS + AK4396.

But... I have a problem. I cannot have the board recognized by my late 2012 13" MacBook Pro with OS X 10.9 (Mavericks). This is the error I get:

Code: 
USBF:    195.308    The IOUSBFamily is having trouble enumerating a USB device that has been plugged in.  It will keep retrying.  (Port 1 of Hub at 0x14000000)
USBF:    196.620    The IOUSBFamily gave up enumerating a USB device after 10 retries.  (Port 1 of Hub at 0x14000000)
The same thing happens with my son's Mac. On the contrary, everything works fine if I connect the board through a USB Hub with external power supply.
On a Windows PC I don't have to use the external hub, but the board is recognized also if I connect it directly to the PC USB port.

Is anyone having similar problems? Is anyone using the board with success with a MacBook without having to resort to use an external hub?

Ciao,
Marco
Click to expand...

Most probably the USB port does not have enough power for the boards. The sound quality difference between USB powered and using even one of dedicated power supply for DAC and reclocks is quite drastic. I'm using powered (1 or 2 power sources) board with Windows and Linux and never had a problem.
 
#156
Agreed. You're going to want to provide provide discrete power to both the USB XMOS receiver as well as the DAC board (if using). As Joro said, higher quality power to the DAC will yield great results. I'm working on my second DAC using the AK board, and it's kind a funny - two BIB Salas shunts for the USB/DAC boards, and I'm finishing a SSR03 super reg for the JG Filter. The funny part is the XMOS/AK stack taking so little space, with 3 relatively large power supplies.
 
#157
MisterRogers said:
Agreed. You're going to want to provide provide discrete power to both the USB XMOS receiver as well as the DAC board (if using). As Joro said, higher quality power to the DAC will yield great results. I'm working on my second DAC using the AK board, and it's kind a funny - two BIB Salas shunts for the USB/DAC boards, and I'm finishing a SSR03 super reg for the JG Filter. The funny part is the XMOS/AK stack taking so little space, with 3 relatively large power supplies.
Click to expand...

Quite big really! What about the measures of the trafo?
I'm planning to use a single TPA Placid HD set to 5V to supply both USB and DAC, 1A . Would it be ok?
 
#160
🙂 Understand. Not sure about Teabag's BIB GB; he often has extra boards. I picked up a few more a week or so ago. I've become a big fan of Salas/BIB's; built properly for analog or digital use - I've yet to use one in a circuit without audible improvement.
 
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