Feedback from jbl speakers? Help?

[scrTchs]

Ok so I bought a pair of jbl 15 g2's used and they work fine when just used for keyboards, guitars,mics, etc. but if I try and run the speaker directly from my fast track pro USB interface I get a too much feedback. I wasn't running it to a mixer first just fast track straight to the jbls with 1/4 inch cables.
What am I doing wrong?

[dsu]

What is plugged into the Fast Track Pro?

[scrTchs]

At the moment there is an arturia minibrute and a microkorg xl plugged in to it as well as a set of Roland monitors coming out of the unbalanced RCA output. The minibrute is connected midi as well.

[H20nly]

is your mic plugged in?

[re:dream]

And how is all of this connected to Live?

[scrTchs]

Minibrute to input channel 1 with midi in and out as well to the fast track, microkorg to input channel 2, and that's it. Just going out to the speakers from there. Sometimes I just run the Korg right into the brute and use the 2nd input for vinyl turntables .

[scrTchs]

haha…anyway problem wa solved