Posted by Wayne Parham on September 04, 2001 at 19:56:57

In Reply to: Re: Theater Series three Pi posted by Observator on September 04, 2001 at 11:27:02:

You asked what Pi Alignments recommend for the Eminence Beta 12LT speaker. Eminence publishes the following specifications:

Vas = 4.81 cubic feet
Fts = 45Hz
Qts = 0.51

And these correspond to PiAlign values of:

Vad = 4.81 cubic feet
Frd = 45Hz
Qd = 2.0 (1/Qts)

PiAlign recommends a bass reflex cabinet of 2.4 cubic feet tuned to 33.75Hz and having Q of 1.5. It recommends doing this using a 2.5" diameter port that's 2.75" long, which is very close to a perfect match - corresponding to Frd of 34.0Hz and Q of 1.56. Without any volume displacements, it is suggesting the cabinet be 24" x 16" x 11", but after consideration of the volume displaced by the speaker driver and the wood thickness, I'd expect your cabinet's outside dimensions to be closer to 26" x 18" x 14". And while these cabinet dimensions can be off a half inch or so, be sure the port dimensions are "right on the money." You must have inside dimensions of 2.5" diameter and 2.75" long for the design to be optimal.

• Re: Beta 12LT in PiAlign'ed cabinet - Observator 10:10:37 09/26/01 (1)
  • Re: Beta 12LT in PiAlign'ed cabinet - Wayne Parham 16:15:19 09/28/01 (0)
• Re: Thanks a lot ! (nt) - Observator 01:19:55 09/05/01 (2)
  • Good luck and keep us posted! - AudioLapDance 05:44:42 09/05/01 (1)
    • Re: Good luck and keep us posted! - Observator 06:23:16 09/05/01 (0)