Setup:
2x KRK RP6 G3 Speakers
Focusrite Scarlett 2i2
DDJ-SB2
Windows 10, i7 4790k, 16GB RAM
My SB2 is connected to my 2 RP6s via dual RCA and from the SB2 it is connected to my PC via USB (which powers it)
So I'm having problems with my DDJ-SB2. Whenever I go to use my SB2 and have the RP6s as the output they will make a horrible high pitched noise which completely ruins the sound. After this occurred I tried using a laptop which seemed to solve the issue. I also tried using a different pair of speakers (some old Logitech speakers I had lying around) which worked perfectly fine as well. After all this testing it appears to be something wrong with my computer but I'm really sure how so or what to do to fix this. Any help will be greatly appreciated!
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@Sebastien > It would seem to me that the noise is caused by some kind of interference from one of the devices. When you used the laptop, did you have the power supply connected or disconnected?
No, the laptop was running off of it's own battery.
@Sebastian > That further confirms my theory of interference -- occasionally when users have this kind of issue with a laptop, disconnecting the power supply will resolve the issue.
I would recommend you test devices in combination to determine where the noise is coming from, it's possible that your desktop computer has a poorly shielded USB chipset and noise is coming in that way, so even if it was just the controller connected to the computer, you would notice it.
From all the testing so far it does appear to be something to do with the USB chipset. When I tried another laptop that worked fine and proved that it wasn't the RCA cable or the speakers.
To eliminate the possibility of it being my extension lead I plugged in my PC directly to the wall and the sound still occurred. I also tried using a different USB cable and had no luck with that. Tried all the USB slots both front and back USB 2, USB 3 and got the same result.
So Bearing all of this in mind it does seem to be something to do with the USB chipset. From what you said before it sounded like there wasn't a fix for this. And is there a way to properly diagnose this instead of using process of elimination?
I would try the following test's.
download a copy of ubuntu linux, put it on a usb and then boot it, you can run mixx which support the sb2's audio output and test the signal, this eliminat's windows and proves if it's the usb chipset or not, i doubt it is, I've had the whine issue in windows a few times with sb2, the solution was to reinstall my vdj which some how was damaged (used repair option)
if you are getting whine while connected to power then it could be ground loop or improper house wiring (clubs suffer this issue a lot due to the quick/dirty extra power options)
if you get whine off power as well as on power then disconnect phono outs and use H/phones only , does the issue still exisit, if so and you have tested a different os then issue is with USB chipset (could be low power, try via powered hub)
darkspr1te
@Sebastian > Unfortunately there's not much else I can suggest or offer in terms of work-arounds; if a second computer doesn't exhibit the noise, it shows the problem is not with the controller itself, bur simply the first computer and the controller in combination.