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Kcct82 wrote:

Hey guys, I bought the Goto 505TT with S150 horn brand new over 2 years ago. Guess what? I'd still be in sonic shit if I followed the 200-1000hz "recommendation". The 505TT does not perform well below 400hz and when I finally got a chance to measure the response, it showed a significant drop in output between 200-400hz. That explains why I've always had a problem integrating the upper 3 horns with my 53hz midbass. It wasn't so much because they were setup horizontally but the fact I've had a sonic black hole between 200-400hz. Ironically, I'm happily using the front portion of the S150 horn (150hz with about 4" throat) with a 6.5in driver John Hasquin had said good things about. Sonically, the 6.5in is slightly less sharp and less neutral sounding than Goto 505TT but the fact it goes down to 200hz is more than enough to make up for it. If I ever go 6 way I'd probably load a 6 or 8in into a 135hz tractrix for the punch between 150-400hz then load Goto into 200hz tractrix for 400-1200hz. Keith

That is what I did. Macondo has 125Hz tractrix with 4” throat an 8” Fane Studio 8M for upperbass tune for 115Hz. The next channel is what I call Fundamentals 500-1000Hz, I use 250hz tractrix with 1.5 throat and Vitavox S3 driver. My initial sentiment for years was that I would like to have my Fundamentals channel to go a bit lower, let say to 350-400hz but I did not want to the diameter of the Fundamentals horn to grow. Then, what I began to use the a dedicated midbass horn (40-107Hz) I felt that I do not have drive my Fundamentals lower as the upper knee of midbass do what is necessary in 350-400hz region.

I do not like the drivers like Goto 505TT. They are all the replica of Western Electric idea of using a 1” MF driver and to drive it with very long and very slow opening horn in order to get 100Hz.  Yes it is possible to do but such a long horn unfortunately has no use in contemporary systems. If one use time-alignment as religiously as I do then those time of divers had no use at all. You can get from them reputable 500Hz and that is about it. You need to do for Goto drivers of 3-4’ exit to get 200Hz from them in tractrix.

There is another side of the story. Goto driver shall be notoriously not stable. It is a small driver manufacture with no quality control at all, with history of neglect to measurements, with practically zero user intelligence invested in the fields.  Goto operates in environment of absolute ignorance of users and am very certain that they do not maintain any manufactures standers. As any other compression drivers out there the diaphragm of your Goto 505TT shall be aligned and only this can easy bring you a ½ octave lower operation.  I am sure many Goto users feel that driver maintenance means to shine Goto labels but as I said – there are plenty of Morons out there… take a look if that “significant drop in output between 200-400hz” happens identically for both of your drivers. It might happen that the diaphragms are not centered properly in the gap – a very common problem.

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