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CSS is in Michigan now.
Misco is in Minnesota (IIRC), but don't know if they do direct sales.http://www.miscospeakers.com/products
Solen, in Canada.
Apex Jr. has some in California.
DIY Sound Group
Acoustic Elegance in Green Bay, WI. http://aespeakers.com/shop/
Stereo Integrity, NC: http://stereointegrity.com/products/, I think it's the same place Sundown Audio is built from. http://www.sundownaudio.com/
InDIYana Event Website
Misco does direct, but in batch qty. At one point I might have suggested GR Research but after a recent interaction with the owner, I cannot recommend them.
Marty/Chuck- He's done what Chuck informed me of before. Back in the old Mad-board days he was a schmuck then too. He stiffed me on door prizes one year for InDIYana. Casual conversation where he is leading and 'being the knowledgeable party' usually is congenial and a sales pitch. When you doubt him as the smarter party the teeth come out snarling.
There was a thread about Bybee filters that is the first to come to mind. Danny swore up and down that they were wonderful, and offered them to Jeff for a trial run. They were supposed to be run right at the drivers according to the description and Danny's nudging, but Jeff figured at the input terminal was good enough. Jeff listened and measured and heard/saw nothing that dictated these were more than a bulbous length of copper wire, and when he said that publicly, Danny just went off like a firecracker.
He'll promote high dollar parts all day long, and state that he supposedly has won awards for his voicing and/or knowledge. I think those are all for show. I heard the M165/Neo3 combo kit he sells and really wasn't impressed. The breakup was still present on the poly woofer, and the tweeter was a touch hot, and this was in a well damped/diffuse room. The bass rolled off early in the sealed design as well. Slightly bright for 'added detail' would be my synopsis.
To the uninformed/uninitiated masses, his stuff might be alright, and better than mass produced garbage, but not to you or me.
Newark still stocks several MCM drivers, or are they wholesale only now?