Servicing ATC SM75-150

[mbrennwa]

I am in the process of servicing a pair of ATC SM75-150S drivers. They look pretty beaten up. So far it's going well, but... whish me luck, I'll need it!

 

[mbrennwa]

It was easier than I thought! Alignment of the new coil/dome units was easy enough using a spectrum analyser, although I could have done 95% by ear. I tried to upload some photos and distortion graphs, but the forum software does not play nice at the moment.

 

[hugo stiglitz]

I'd like to see some pictures... only words is a bit boring

 

[mbrennwa]

I'd like to see some pictures... only words is a bit boring

Here you go... I was amazed by how much the harmonic distortion decreased. The tape was there to prevent metal dust/particles getting into the gap. I replaced the whole dome/coil assembly, and also the "wave guide".