Just got my second DT25 and trying a stereo setup with my HD500 via line6 link. Sounding great but no matter what i try, amp A always sound much louder than amp B. Using dual preamp setup in HD500 with exact same values, and mixer set identical on both paths. Still amp A is louder. Is this normal behaviur? Suggestions other than panning mixer hard L/R and volume on path B to full?