After rebuilding my MK2a to a 32gb drive, and upgrading my software from 1.03 to 2.00, I have noticed a change in the volume adjustment. My empeg is and has always ran into the AUX input of my Alpine head unit. I used to keep the volume on the empeg set at around -6.5db and adjusted the volume on the Alpine head unit. Now, the volume set at this level on the empeg creates crackling and distortion, so I have to turn it down quite a bit, to around -16.00db or so to eliminate this.

Is this normal?
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1993 MR2 MK2a 32gb. 1991 NSX unfortunately with and IPOD.