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View Full Version : 8.4 cuft displaced w/78sqin port tuned @ 31.5hz



Savag3
06-08-2010, 10:40 PM
for two RD Alpha 15's 2000 rms . . Its been so long since i built for these does this sound right ?

I Like Waffle
06-08-2010, 11:13 PM
needs more port. Id go with 120-130 if its a slot port.

basscort2009
06-08-2010, 11:15 PM
at LEAST 16 inches per cube is recomended

cthedinger
06-08-2010, 11:18 PM
Like Heath said but I would try and get closer to 18-20 sq of port per cube

Savag3
06-08-2010, 11:19 PM
and this rule applys to all woofers ? im just wondering if the 8.4 is too much also

mazdakid
06-09-2010, 01:05 AM
no atleast 16 doesnt apply to all subs. ive heard rd subs like smaller port area.

Savag3
06-09-2010, 03:46 AM
ya thats what i cant remember i think an alpha 15 wants 30sc in ? 35 maybe ?

d-REW
06-09-2010, 03:50 AM
unless your using aeros but your still at the low end

FurbiesAndBeans
06-09-2010, 03:53 AM
12-20 for daily, over 2- for spl.

I got a 10" Sonance. 1.25 cu ft with 20 sq in, so 16 per cu ft. The recommendation is 25 sq in, so that'd be 20 per cu ft.

Savag3
06-09-2010, 03:55 AM
12-20 for daily, over 2- for spl.

I got a 10" Sonance. 1.25 cu ft with 20 sq in, so 16 per cu ft. The recommendation is 25 sq in, so that'd be 20 per cu ft.

wwhats the recommend for an alpha 15 ?

FurbiesAndBeans
06-09-2010, 03:57 AM
wwhats the recommend for an alpha 15 ?

Don't know it exactly, sorry

You can head to carstereoforum.net and im sure some one there can help u out (aka Kevin)

Savag3
06-09-2010, 03:57 AM
unless your using aeros but your still at the low end

the low end of the port spectrum ? as in it could be bigger for two alpha 15's ? what do you think about the Vb of 8.4cuft ?

d-REW
06-09-2010, 04:00 AM
3 6" aeros would be 84.78sqin" around 10.07 per cube

Savag3
06-09-2010, 02:17 PM
help

T3mpest
06-09-2010, 05:12 PM
It's a big SPLish/daily sub it's going to want port area. Subs with high BL always need more port area.

on1wheel01
06-09-2010, 11:44 PM
Yea that's way to low. I always shoot for 18 or more if possible