Use this thread to discuss the MTB-246 design posted here.

its a big cabinet .which side is bottom

@tamuksthe side with 77.0cm is the bottom.

Does MKH-230 = MKB-230?
They look like the same plans.
Any other suggestions for a large bandwidth horn?
Any other suggestions for bass guitar speaker cabinet?
Bandwidth of bass guitar is 329.63 to 1108.73 Hz

That seems like a pretty restrained range for a bass guitar. I would think a bass guitar would go lower than that. I would think you would want to get down at least to 60hz unless you are using a separate sub-bass cab too. On the top end I would try to hit at least 5K.

Personally I would go with a nice two or three way reflex box.

Thanks, any plans here that you might suggest?

I would just design my own for reflex. WinIsd is a great resource to help design one or there is this online box calculator http://www.mh-audio.nl/ReflexBoxCalculator.asp

If you really want to go with a premade plan, you could try making a full range cab like a DM2 http://www.speakerplans.com/index.php?id=dm2. It would go higher than needed but I bet it would sound awesome for a bass cab.

Wow man, thanks for the link to the box calculator! This may play into a twist I wanted to add the gig: Each of the four speakers will be driven by four separate special guitar pickups with very specific frequency bandwidths. If each of the four speaker enclosures were designed to have a high acoustical gain (or resonance?) at these four specific bandwidths, that would be the bawm!... That's like, acoustical crossover networks!... Heady stuff!

could someone come up with the 15" version of it?