Home » Sponsored » Pi Speakers » Wayne, your opinion please.
Wayne, your opinion please. [message #37051] Sat, 22 June 2002 18:17 Go to next message
ToFo is currently offline  ToFo
Messages: 219
Registered: May 2009
Master
Wayne,
If/when you have time, would you please look at these numbers for me? I want to know if you think this driver is suitable for Pi alignment, or is it crossing the line into mudmotor/loose woofer territory. I am not a sub fan but this is interresting. I would likely cross @ 70Hz to a kappa or omega 12" if I get these subs. (friend says box is too big, I told him to let me check it in boxplot before he bought them. Ha! now he wants to sell CHEAP!)

Thanks,
Thomas

18" Eminence OEM Subwoofer

Fs: 26.6 Hz
Vas: 15.0 Cu. Ft.
Re: 2.95
Qms: 12.06
Qes: .41
Qts: 0.40
Bl: 13.87
SPL: 98 dB 2.83V/1m
Sd: 180.8 sq.in.
Xmax: 7 m
Mms: 159.4
Magnet weight: 90 oz.

PiAlign says... [message #37054 is a reply to message #37051] Sun, 23 June 2002 11:22 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18683
Registered: January 2001
Illuminati (33rd Degree)
Using your numbers, Fts=26.6, Vas=15.0 and Qts=0.40, PiAlign values are Frd=26.6, Vad=15.0 and Qd=2.5. PiAlign suggests making a 6 cubic foot box tuned to 25Hz. For a bass-reflex cabinet, actual dimensions are 34" x 22" x 15" and with a rectangular port having inside dimensions of 3 15/16" x 6 15/16" x 14" long.

The resulting system has a lower -3dB point of 40Hz and response down to this frequency is nice and smooth.

Thanks Wayne! (I must get comfortable with Pialign) [message #37055 is a reply to message #37054] Sun, 23 June 2002 11:35 Go to previous message
ToFo is currently offline  ToFo
Messages: 219
Registered: May 2009
Master
You are a huge help.
Thomas
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