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In the Forum: Horn-Loaded Speakers
In the Thread: Eventually - a reasonable midbass horn from GOTO
Post Subject: GOTO design efforts? Ahhh?Posted by Romy the Cat on: 11/21/2007
With Ming permission I post a fragment of his emails where he describes his midbass horn. It appears that he uses cone-drivers with ltooooooo ow Fz in non-compression application with no back chamber. Now it is obvious where he is losing his midbass response and where his horn underperforms. I extend to much credits for the “GOTO design efforts” :-). Also below is the PDF file with GOTO driver specification to understand what Ming is talking about.

After my visit to Japan last year and heard the GOTO bass horn myself, I started to plan on my own bass horn system.  However, due to the size of my listen room(16x25x9 ft WxLxH), I have to limit the size and cutoff to 60Hz.  Finally, I decided to use double driver per channel to reduce the length of the horn and that make it possible to fit such 60 Hz horn into my listen room and still have enough room to listen to music.

BTW - I will use double GOTO 15" woofer in a bass reflex box for 70Hz down.  Also, maybe going for the 18Hz bass horn later.

GOTO has never build any production horn lower than S150 horn because any horn lower than that it is not possible and sensible to build at GOTO and then ship or move.  GOTO does provide all technical support and information to help the customer build the horn.  The customer has to find local contractor or builder to build their own horn.  In my case, I ask for Jeffrey Jackson's help to build this 60Hz midbass horn.  GOTO does supply the twin throat adapter and will also provide the specification if one want to build their own.  Attached for your reference.

Of course, if any US customer want to also building bass horn using GOTO driver, I can provide a turnkey project but the cost will be very high as you can image.

I build this 60Hz horn based on GOTO SG146LD4 bass driver specification and the space limitation of my room.  The same GOTO driver has been around for many years and most of people use it to cover 200Hz down to 20Hz.  I intend to use this midbass horn to cover 70Hz to 270Hz in a 4 way system.  The rest of my system will be a new SG5880S to cover 270Hz to 5kHz and a new SG188S tweeter to cover 5kHz up.  The dual SG38WNS 15" woofer in bass relfex cabinet will cover 70Hz down.  Still thinking of using dual 15" GOTO woofer in a single folded 18-20Hz horn if my room have space for it.  Jeffrey is still working on the design but won't be ready until late next year if I decide to go for it.

http://www.goodsoundclub.com/PDF/GOTO.pdf

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