Has anybody else that uses a Blitzsafe adaptor that changes the CD Changer line to Auxilary had any audio quality issues?

I purchased a Blitzsafe adaptor for my Audi TT (BOSE) setup and had it replaced because the quality was so bad and the new one sounds just as bad as the first. Previously, I was running a Dension Icelink setup through my TT's headunit and it sounded great! The Blitzsafe is muddy and just terrible.

Anyone else experienced anything similar?