Huge Concrete speaker cabinets in foundation

[paulspencer]

Some have suggested the Lab horn but I'll suggest some alternatives that are cheaper and simpler.

Adire have a horn design for the Tempest which is about as simple as a horn can be. It can go up to 200 Hz so crossed that high you would want a stereo pair. IIRC it's about 0.6m wide x 0.9m deep x 0.9m high.

Bill Fitzmaurice also has a horn design (Tuba) based on a single driver.

To match the output you could do:

* 3 way with high efficiency drivers eg. Adire HE10
* array with hifi drivers

Since the Tempest horn will go quite high, you don't need to go further than 3 way. A simple solution would be an array with the CSS 4.5" XBL2 driver and you might even be happy without a tweeter, depending on your tastes.

Consider Ultradrive for the crossover and be ready to put in some room treatment and do some eq for room correction. Those concrete walls will have horrendous room modes!

[Centauri]

Originally posted by MrCheeks
Settle down, nobodies calling you an under floor design

[Hornlover]

Those cavities would house a couple of Jensen Imperial built-ins very well. A tasty prospect. The Imperial is an excellent compromise, and can emply your bowels with little effort.