JL Cleansweep outputting two inputs at once

[acprkit]

Hi

I just installed a JL Audio Cleansweep in my 2007 Toyota Camry with the stock HU. The setup is: HU output is wired into the Cleansweep, which is then connected via RCA to an Alpine Mrp-f300 amp.

Here's the issue: The Cleansweep will only output head unit audio on the front channel. It will also only output aux audio (iPod) to the rear channel. It does this at the same time. thus, the radio is playing in the front, while the aux is playing in the back.

I have checked the input my plugging it directly into the amp, and all the input channels from the head unit are fine. If I unplug the aux jack from the Cleansweep, it will still only output the radio to the front channel.

I bought this used, and don't have the volume knob, though this should not be a problem.

Any ideas?

Thanks!