Question about Edirol UA-1EX Sound Card
I pretend to use the UA-1EX as a USB audio interface between a "Sony VAIO FW-21M" laptop (with Windows Vista 32 bit OS) and a pair of powered monitors "KRK RP6".
I installed the driver and the audio device works fine if the laptop is on battery mode, as soon as I connect the laptop's AC power to a socket (all the sockets were tested and they have electrical ground) I started to hear a loud noise/distortion (like radio static) through the monitors in the audio playback.
I checked all the items from troubleshooting in UA-1EX owner's manual and I can't solve the problem, there's no mic connected, or a microwave or a TV nearby. In the room is just the laptop, the UA-1EX and the monitors.
To test the UA-1EX, I connect it to a "Macbook" and it works fine with clean sound (battery mode or plugged into a socket).
To test my "Sony VAIO", I connect it to a "Native Instruments Audio Kontrol 1" audio interface and it works fine with clean sound (battery mode or plugged into a socket).
So, apparently all the devices are OK, but the truth is when I try to plug my "VAIO" laptop's AC adapter to a socket, the UA-1EX can't filter the static (or whatever is that noise that starts) and passes all that noise to the monitors make it impossible to have a clean sound, consequently it's impossible to produce any kind of work, and the laptop is connected to electrical sockets 99% of the time.
_As I said before the UA-1EX worked fine with a "Macbook". Both "Macs" and "VAIOs" have AC adapters, but while the "Macbook's" AC adapter transforms 220V (Europe) into 16.5V, the "VAIO's" AC adapter transforms 220V (Europe) into 19.5V, I don't know if it could be important.
_The only thing I couldn't check in the UA-1EX owner's manual troubleshooting was the item "Advance Power Management Support" and "Don't Poll Power Supply Status", can't find this in Windows Vista Device Manager, only found the battery power management but it's useless.
I really appreciate that you could help me to solve this.
The UA-1EX can supply phantom power to condenser mics so the issue with the noice is a ground loop problem between the UA-1EX and your other devices (laptop/amps in the powered speekers.) I had the same problem so I found a Direct Injection box (D.I.) that allowed me to convert an stereo RCA Signal to two balanced XLR signals or vice versa. Whirlwind is the brand of mine. There should be two grouding switches on the DI that will allow you to ground the UA-1EX and get rid of the noice. Hope this helps.
Posted on May 08, 2009
No solution, but I had the same issue with my old laptop, I tried everything, the only thing that worked, was to use a voltage generator, set it to 19.5 V (this was what my laptop was converting to) and getting a laptop power plug and creating a connection. Because the power pack is a SMPS, it was very noisy and this noise would be transferred to the recording.
Question of my own, where did you find drivers for Windows Vista 32 bit? I can only get my UA-1EX to run as speakers, not a recording device!!! HELP!
Posted on Feb 07, 2009
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