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In the Forum: Horn-Loaded Speakers
In the Thread: Eventually - a reasonable midbass horn from GOTO
Post Subject: Goto midbass horn construction...Posted by Jeffrey Jackson on: 11/20/2007
hello again Romy, cats, friends...

I built this horn for Ming Su, the Goto USA importer... I have posted on your site before about midbass and bass horns... I listen to eight foot straight 45 Hz horns... and as partial payment on this commission I received some drivers... so I look forward to trying dofferent horns with them... it should be fun.. :^)

for Ming I built this horn to a combination of Goto and my thoughts... Ming wanted to pursue teh Goto recommendation of 2:1 mouth ratio.. I like 1.6:1.. but that is a minor detail... the flare is Goto's hyperbolic... 60 Hz was chosen as largest full sized mouth that will fit in the room vertically... beyond this, the length also gets to be an issue.. we just figured build as much as you can fit that is properly built... try not to compromise the horn by shortening or shrinking the mouth...

construction is all baltic birch.... the sides are three straight sections.. three step approximaion... the top and bottom are curved to match the exact flare... sides are 2x 3/4" sheets laminated together to form 1.5"... the top and bottom are six layers of 1/4" laminated to again for 1.5".... the only area that required extra bracing was right at the mouth on the long side... here I used steel "L" channel.. the curves of teh top and bottom really help keep them stiff...

the system still needs to be played and tuned, but I can honestly say that I heard detail in the bow/cello inteface that I had never heard before...

bass will at first be dual goto 15" per side in a large sealed box below the horns... Ming is also contemplating a single fold 18 Hz bass horn... the midbass horns would have to be turned sideways and set upon the new basshorns... we'll see...

Peace,
Me

(I know that I am a manufacturer, but I am one who only makes a few things a year and custom per the customer's request.. so maybe not so bad?)

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