I am Sven and I have been modifying an ATC SCM 20 SL loudspeaker that I bought 1990 with a Mundorf AMT tweeter and better cabling and Xover parts. This was a satisfying and fun endeavour. The ATC has now been retired and replaced with a Qualio IQ. Now, I plan some equivalent modifications. Apparently, there is already a discussion about the Qualio IQ which I plan to join and I was hoping for some guidance.
