Marvel Posted January 1, 2018 Share Posted January 1, 2018 The APT-50 that I use on the Eminence horn is the Tonsil version, before they started making their own. I really like them. Since I pulled the mids down, they worked very well and sounded quite balanced. Bruce Quote Link to comment Share on other sites More sharing options...
Dave A Posted March 30, 2018 Share Posted March 30, 2018 On 12/30/2017 at 3:45 PM, BEC said: Well, this is a bit complicated. Originally the APT-50 Eminence sold was the Tonsil driver. So, yes I started out using the APT-50. When Eminence had a clone made of the Tonsil driver, they sent me a sample and it was junk, just plain not usable. So, I contacted Tonsil in Poland and had them make that original driver for me, so I have always used the Tonsil driver. The APT-50 that Eminence sells now is not interchangeable at all with the Tonsil driver. Even the mounting threads are different. Bob Crites Bob the one I got from PE the other day was a 1 3/8 18 thread and fit that tap just fine. Did I get an older one and what is the difference in the threads? Quote Link to comment Share on other sites More sharing options...
BEC Posted March 30, 2018 Share Posted March 30, 2018 The one with the 1 3/8 18 thread is the clone of the original Tonsil driver that had a different thread. The original Tonsil driver that I use looks like this. Sorry this is an old dirty one that was in my junk drawer, but you can see the way the threads work. Quote Link to comment Share on other sites More sharing options...
Dave A Posted March 30, 2018 Share Posted March 30, 2018 How bad is the newer one compared to the older one in your experience? Quote Link to comment Share on other sites More sharing options...
BEC Posted March 30, 2018 Share Posted March 30, 2018 Just look at this PDF from back when Eminence used the Tonsil driver. And then the Eminence data sheet for the current driver here. http://www.eminence.com/pdf/APT50.pdf eminence apt-50 copy.pdf Quote Link to comment Share on other sites More sharing options...
geoff. Posted March 30, 2018 Share Posted March 30, 2018 Well, that sets the record straight then, doesn't it! Quote Link to comment Share on other sites More sharing options...
BEC Posted March 30, 2018 Share Posted March 30, 2018 By the way, there is an adapter that converts the original Tonsil driver to the standard 1 3/8 18 thread. Bob Crites Quote Link to comment Share on other sites More sharing options...
Dave A Posted March 30, 2018 Share Posted March 30, 2018 Bob with adapters like this and variance between manufacturing standards there are discrepancies. What I mean is there will be minor diameter differences between tweeter outlets and adapters and horn lenses and perhaps some gaps and does this interfere in general with sound quality in any meaningful way? Quote Link to comment Share on other sites More sharing options...
BEC Posted March 30, 2018 Share Posted March 30, 2018 Well, obviously have not tested every possible combination, but this adapter is very short and was made by Tonsil to be used with their driver to allow use of some different horns other than the one they sold for use with their driver. Anyway, the adapters turn the Tonsil (as far as mounting goes) into almost the exact thing as the current APT-50. 1 Quote Link to comment Share on other sites More sharing options...
audiofan Posted May 26, 2020 Share Posted May 26, 2020 This is right where I'm at after building Khorn bass bins and upgrading AA X-overs with sonicaps. How does the Eliptrac HF B&C DE120 compare with the CT-120s? I only want to spend once. Any help would be great. Thanks in advance. I love this forum. Quote Link to comment Share on other sites More sharing options...
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