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Hi martin2395

I think that SELENIUM HL14-50 would be very good replacement for 2311.
http://www.parts-express.com/selenium-hl14-50-2-exponential-horn-45x45-4-bolt--264-316
Its price about 25U$D...

Hmm, with 2231A/H may be 2205 can be used as mid-bas, and some 811B "look-a-like" (bi-radial) horn but with 1.5" inch throat used with 2447 ( say at least with Radian 1245-J diaphragm),
and for sure...

Hi JBLP,

sorry for too late answer: 0.6m means 60cm.
http://www.audioheritage.org/vbulletin/showthread.php?34471-DIY-JBL-4344-project&p=352504&viewfull=1#post352504

so for your box INTERNAL...

Hi JBLP,

Wonderful work.
Too much absorption would reduce bass-reflex contribution to the frequency response, as the driver alone is almost not 'emitting' sound near box resonance frequency.
I...

Hi JBLP,

Your work is absolutely gigantic, but I think that You have made one "mistake" not arrange the place for the future expansion from 2425 to 4-inch diaphragm driver as 2441-45-50 with 2311....

Hi JBLP, 250 is fine, I have used

regards
ivica