USB audio interface with separate outputs for monitors and subwoofer?

[Marcus Aseth]

Hello everyone, I'm in search of an USB audio interface of reasonable price that has separate output for monitors and subwoofer.

The reason is this - currently, my rig is setup as follow:
Gaming PC <-(USB)-> UMC22 interface <-(TRS a RCA)-> Subwoofer <-(RCA a TRS)-> Monitors

The signal from the PC goes into the UMC22, then is passed to the SVS SB1000PRO, and then to the Kali lp6v2.
The problem in this is that the SVS only accept RCA cables, so it's introducing unbalanced cables in the system. The result is that, when my GPU is under load (for example while running a game) then there is a very audible noise/interference coming out the tweeters and drilling into my brain, today as an experiment I've connected the UMC22 directly to the monitor using an TRS to XLR cable, bypassing the subwoofer, and that obnoxious noise was completely gone ^_^

So my choice here is either to sell the subwoofer, or find a way to use it.
I thought that if I had an interface that could send 2 balanced cables to the monitors and then an unbalanced RCA cable to the subwoofer, it wouldn't cause problems because the subwoofer cannot reproduce that high-pitched noise to begin with.

Am I correct in my assumptions?

If so, can you recommend me the ideal candidate?
It has to be an USB interface so it can be connected to the PC, I need something really basic, since the only use I have for it is to allow me to use these monitors with my gaming PC. A knob for the volume is handy, but not necessary.

 

[JStewart]

I take it Focusrite Scarlet 4i4 is more than you’d like to spend?
Have you tried a usb isolator? One might do the job, be less expensive than a new interface and if purchased from Amazon easy enough to return if it doesn’t work.

 

[Marcus Aseth]

I take it Focusrite Scarlet 4i4 is more than you’d like to spend?
Have you tried a usb isolator? One might do the job, be less expensive than a new interface and if purchased from Amazon easy enough to return if it doesn’t work.

Yeah, 250€ only to be able to plug the subwoofer feels a bit extreme, I was hoping it could be less. This will be my last resort, thank you for the suggestion ^_^
Regarding the usb isolator, I'm not sure what they are, how to recognize the one I need and choose a good one - could you recommend me which one to take?
If it's not trouble, you can see here on https://www.amazon.it the ones that are available for my country ^_^

 

[JStewart]

Yeah, 250€ only to be able to plug the subwoofer feels a bit extreme, I was hoping it could be less. This will be my last resort, thank you for the suggestion ^_^
Regarding the usb isolator, I'm not sure what they are, how to recognize the one I need and choose a good one - could you recommend me which one to take?
If it's not trouble, you can see here on https://www.amazon.it the ones that are available for my country ^_^

I’m not sure I’m seeing all the choices without logging in, but one like this would be what I’d try. You may need to supply power to it. I didn’t translate to see if a power supply is included.
Not sure about Amazon’s return policy in your country, so please be sure you can return it if you’re not satisfied.

 

[Marcus Aseth]

I’m not sure I’m seeing all the choices without logging in, but one like this would be what I’d try. You may need to supply power to it. I didn’t translate to see if a power supply is included.
Not sure about Amazon’s return policy in your country, so please be sure you can return it if you’re not satisfied.

Wow, these things are expensive! xD
Although after some testing, I might simply be able to go by still using the RCA cables, setting the monitors Gain to 25% and the interface to 70%, I've noticed that this way the "noise under GPU load" is so faint you almost don't hear it at 50cm from the speakers, totally bearable!

But thank you for the help ^_^

When I get the chance I'll upgrade to the Scarlet 4i4, but with the current workaround, is not a priority anymore, and this will also buy me time for it to go on a 50% discount or something! ^_^