any words of wisdom for usb noise problems?
Steve, Problem "1" pontentially solved utilizing a battery powered USB hub For a $17 gamble I'm game to investigate a possible improvement to an already excellent device - love my U24! |
My prevoius post may have been premature... here is an interesting product I stumbled upon as well. It's basically a 5V battery pack built in the middle of USB cable. I can't seem to find the power requirements for the U24 in the manual but this product looks like it may work with the Waveterminal. I may bite and report back with my results. The battery powered hub that I came across but may not be powerful enough. |
I found the solution for the noise problem and it is amazingly simple and totally free, at least in my case, but I think also for a lot of other users of external soundcards in general. The problem was not the quality of the power supply. The digital noise was created by a ground loop between my laptop, the U24 and my audiomixer. All noises disappeared instantly by plugging the laptop's power adapter in an unearthed AC outlet. Bye bye ground loop, bye bye noise! If you don't want to leave your laptop (or computer) without an earth connection, the other solution is to add a line level DI-box in your analog audio in/out lines. Best regards, Vincent |
The problem is likely a solid connection between PC ground and audio system ground. This is an issue with many USB DACs. A lot of them do NOT offer galvanic isolation, hence, much of the noise from one system enters the other. This is EXACTLY why I use s/pdif transformer isolation in my USB dacs and converters. You won't need to unplug your PC wall-wart. jh |
