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Keith,

I do not see any “O, shit!” effect.  You went for 505TT/S150 combination and it is fine. Why after reading my comments you developed doubts? It looks to me that if you do have doubts then you did not have enough rational to select this specific driver and this specific horn to begin with.

I see nothing wrong what you do. There is no such a thing as “ideal horn should be”. A proper loading of a given driver to a horn is derivate of many factors, the design objective of you particular installation and the type of sound you would like to get are not very last reasoning. The 505 driver is specified as 200Hz but only God know what and how it does in really at which power. The 150B horn is 150Hz horn. In Tractrix world it would do let say 250-300Hz of minimum loading but it would greatly depend of the driver used. Increase the cone mass and you can do whatever you want – even load 150Hz. I have no idea what Goto do and how it works with their drivers. It is not to mention that they use parabolic horn that has more but different bass at the lower knee.

So, there is nothing wrong in what you do.  You pay money to Goto and alone with it you get from them their expertise in design objective and principles. If you do not have your own objective and principles then it is perfectly fine to be dependent upon the company’s doctrine. There is no reason for you at this point to be “worried” about anything. Get your order, set it up and then see how it all work out.   Always remember the following:

http://www.romythecat.com/Forums/ShowPost.aspx?PostID=432

If you would like to share you observations  about the sound after you get your Goto setup then feel free to post it, picture are also encouraged.

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