<font size="2" face="Verdana, Helvetica, sans-serif">It's actually a 35 hz or so horn, with usable response to an octave below. Below cutoff the drivers act as direct radiators just as in the Altec mid bass horns. It's built in modules, requires 3 modules to make a systm. Finished system to be approximately 36x36x60. (3) 20 inch modules.Quote:
Originally posted by Dave H.:
A 20Hz bass horn is an impressive item as a horn that low is usually huge and difficult to incorporate into most homes. Do you have to compensate for the delay with the rest of the system? Would sure like to see a pic of them. Thanks.[/QB]
Very ugly prototype of one module done. It's based on Bill Fitmaurice' Tuba 36 design, I've been playing with mods to chamber volume.
I'm using Oberton drivers made in Bulgaria, I like their BL product. That may or may not be the finished driver. Precision devices looks good, I may even give 515 g's a try but some of the 515's specs aren't right. Still. the proof of the pudding... And the 515G WAS designed as a horn driver. It's BL product (essentially motor strength) is way lower than the above mentioned drivers.
If you want, I'll post links to the forum where guys talk about these, and to the drivers I'm using. There are lots of tests and graphs there of guys who built different versions. Most are using Eminence drivers.
I like the idea of a movable module.
The 8 ohm driver becomes a 12 ohm or so across the 20-100 hz range due to the horn loading. 3 units becomes a 4 ohm load. And 3 units reaches the necessary mouth area, with a perimeter of some 16 feet.
Let me know if you want the links , I don't have them handy but would just take a few minutes to dig for them.
