My Bass just doesnt sound good?

cool mr grinch · Post by **cool mr grinch** » Wed Dec 30, 2009 9:07 pm

is the port the proper size/length for the airspace? i dont know anything about box/port tuning.

Ryan from Ohio · Post by **Ryan from Ohio** » Thu Dec 31, 2009 4:39 am

I will have a look at this later today for you.

cool mr grinch · Post by **cool mr grinch** » Thu Dec 31, 2009 8:25 pm

i've been using some online box and port calculators, and what im coming up with is the port is to big for the box, one question though, do i calculate port area with total cu ft, or with cu ft after subs are installed? there will be a .28 difference. i have 2 options, i can make the port smaller by making the port walls thicker, or i can make it longer? making it smaller would be by far easier.

MobileAudio219 · Post by **MobileAudio219** » Thu Dec 31, 2009 9:08 pm

cool mr grinch wrote:i've been using some online box and port calculators, and what im coming up with is the port is to big for the box, one question though, do i calculate port area with total cu ft, or with cu ft after subs are installed? there will be a .28 difference. i have 2 options, i can make the port smaller by making the port walls thicker, or i can make it longer? making it smaller would be by far easier.

Are you subtracting the port volume from the enclosure volume? Anything inside the box needs to be subtracted from the enclosures volume (sub, port, bracing, midgets, etc.)

cool mr grinch · Post by **cool mr grinch** » Thu Dec 31, 2009 10:05 pm

when i measured the air volume i did not include the port area.

Ryan from Ohio · Post by **Ryan from Ohio** » Fri Jan 01, 2010 8:30 am

Hey I need the full exterior measurements,the port size and length. I will try getting to it later today. Last night didnt happen... rofl.

cool mr grinch · Post by **cool mr grinch** » Fri Jan 01, 2010 9:30 am

full measurements of the whole box including the port?

Ryan from Ohio · Post by **Ryan from Ohio** » Fri Jan 01, 2010 9:46 am

Yes I need to calculate internal air space and take away the ports actual space.

When I do boxes I have an internal air space and a port specification. Then I have to make it all fit together properly in the allotted spaces.

cool mr grinch · Post by **cool mr grinch** » Fri Jan 01, 2010 10:54 am

full box measurements outside to outside. 3/4 mdf. 16" deep, 14 3/8" height, 34 1/2" width. port= 12 1/2" deep, 12 3/4" tall, 3 1/4" wide.

Ryan from Ohio · Post by **Ryan from Ohio** » Fri Jan 01, 2010 1:26 pm

Ok, well if the measurements you gave me are correct:

3.45 cubic foot before displacement, 3.27 cubic feet after sub displacement.

44Hz tuning

F3 34 hz

8.6 dB gain @ 48Hz

The box is to big and tuned to high. If you could add to the port length it would help greatly to lower the tuning and F3.