Tube bass horn

[blakehoo]

One of the knowledgable board members ( ...I think it was Dave ?) mentioned the construction of 12 foot long horns using 15" altec speakers. I have located a pair of 16 ohm 411's in really great sonic, not appearance condition.


Before anyone responds about room size....The room is big and will contain five A-5's. (It had six.) I've had good luck amping them with the new flea power SE OTL's from Transendent Sound but the new amp brings out all the flaws in every other component in the system.
The 288-L in CD horns sound the same as before, but the 416 woofers don't sound as good as I though they did with my other amps. I'm thinking of changing them out for 515's for better mid bass. With subs handling the lowest registers (...say 25 to 100) I think I can get away with it. Plus my RANE AC-22 crossovers will sum the lowest bass signals for subs in two way mode.

The new amp really puts a punch in mid-bass
but there is NO way it can drive subs. Any suggestions on sub amps, or modifications, alternate drivers or plans etc is most welcome.

http://www.transcendentsound.com/single%20ended.htm


Thanks in advance for your help

[Fitts]

Hi,

That was me with the cheap tube enclosure. Go to a construction supply store and get a 12 foot long 14 inch diameter Sonotube. They are used for pouring cement columns. Carefully cut the tube 3 feet in from the end so that you get one 9 foot tube and one 3 foot tube. Mount the speaker facing into the end of the nine foot tube. I drilled eight holes in the tube to match the mounting holes in the woofer. I drilled them about one inch in from the end of the tube and used nylon cinch ties to hold the speaker in place. Attach your speaker wires and then add the three foot piece to the other side of the speaker so that the speaker is in between the two tubes.

The frequency range for this setup is low, about 25 to 125 hz. I think the sound is quite smooth and it can really rumble. I only caution that it is easy to power this system up to the point that you exceed the excursion limits of the speaker so go easy on it until you figure out what it can take.

For an amp to drive it, I really like MOSFET amps like the Hafler 220.

Regards,

[blakehoo]

Thanks, David:
That is exactly what I wanted!!

This pair of 411's would be perfect in that set-up
Thanks again.
Blake