PDA

View Full Version : What am i tuned at?Cu Ft?



BigEM
07-15-2006, 12:18 PM
i tried to finds out by myself but i couldnt get it right, so i build a box that is 32X20X16 and i put 3 4" by 9" aeroports, so i was wondering what is my tuning at and what is th ecu ft i got??

thanks in advance, EM

Worlddre
07-15-2006, 12:42 PM
ports flared on both ends?

xluben
07-15-2006, 12:43 PM
~4.5 ft^3 @ 43 Hz

I used your dimensions as outer dimensions and assumed 0.75" thick MDF. Also, I did not assume any port displacement, so net volume will actually be bit less, and tuning will be ~1 Hz higher.

Try making the ports 16.25" (longest possible assuming ports on baffle and 20" deep box). That'll get you 4.35 ft^3 @ 34 Hz

Yeah, and I assumed ports flared on both ends.

Worlddre
07-15-2006, 12:44 PM
5.925ft3 gross

(32 x 20 x 16) / 1728

gets gross internal volume

BigEM
07-15-2006, 01:02 PM
yeah ports have flares at both ends. so what could i do to lower my hz's i think 43 is too high, but what does it really mean when its that high and if i lowered it what would it sound like??

later, em

ruger
07-15-2006, 01:18 PM
2 ways to lower your hz

1. make the box bigger
2. make the ports longer

here is a port calculator

http://psp-inc.com/psp-inc.com/public_html/..%5Ccgi-bin%5Cport_length_calculator.cgi

BigEM
07-15-2006, 06:20 PM
is 43hz good or is it bad??

later, em

squeak9798
07-15-2006, 06:22 PM
is 43hz good or is it bad??

later, em

Sound quality and low end capabilities will be compromised, but output should be pretty high.

Generally most street beaters prefer a tuning in the 30-35hz range, maybe into the upper 30's depending on the style of music they listen to.

43hz is, IMHO, too high.

xluben
07-15-2006, 07:43 PM
5.925ft3 gross

(32 x 20 x 16) / 1728

gets gross internal volume

gross = external volume

:)