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jaco
05-06-2007, 11:13 PM
if i do a CRX box with ports on the out side, how would i tune it.
would the caculator at subwoofer tools.com work right for that program.

Rawr-DQ
05-06-2007, 11:33 PM
On the outside of the box, I believe the ports will not add any volume, so whatever volume you have not including the space of the port, use that to calculate the length of the port, if it is too big cut it down some.

Lakota
05-07-2007, 12:05 AM
It would be tuned just like any other enclosure. However, there is no port displacement.

jaco
05-07-2007, 01:08 AM
my problem is that i use this program to tune
http://www.carstereo.com/help/Articles.cfm?id=31
and it is for enclosure with inside port displacement.
so i need to figure out how to tune without port displacement.

Trixter
05-07-2007, 01:44 PM
that calculator does not account for port displacement.

use the precision port calculator:http://www.psp-inc.com/ to get the length and don't worry about adjusting the box's volume.

profundus-sanus
05-07-2007, 03:33 PM
http://www.subwoofertools.com/forum/flare.htm

thats based on ttb's flared port formula's.

PatFitz9
05-07-2007, 05:57 PM
i use the psp-inc calculator

profundus-sanus
05-07-2007, 06:05 PM
i suggest the ttb one unless your using psp's ports.

It takes the flair radius compared to tube diameter in account when calculating the effective vs total length.

jaco
05-09-2007, 02:57 AM
thanx everyone that helped

jag09
05-10-2007, 08:43 PM
ok for mine i got: 2.55 ft3
port diameter: 6
# of ports: 2
straight length port: 44.40
flare length port: 45.40

so how would i come up with how long each port needs to be and that stuff?

Rawr-DQ
05-10-2007, 10:10 PM
uhhh what

"straight length port: 44.40"

jag09
05-10-2007, 10:12 PM
for each or like both of them, and also would it be better to go with 3 instead of 2 ports?

Trixter
05-11-2007, 09:19 AM
divide your box volume by the number of ports your going to use. cut each to that length.

jaco
05-11-2007, 09:24 AM
no that would tune in the 30's
it's 55 Hz or nothing.

LOL