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Topic Review (Newest First)

12-30-2021 04:00 AM

ehsanjadoon

Re: Pencil and Paper 101

This is the simplest method I've come across. Thanks for sharing.

03-24-2012 07:10 PM

SINTORMAN

Re: Pencil and Paper 101

Quote:

Originally Posted by cxa0897

its a sticky man, its meant to be bumped

if you have a question or something to add .. not thanks.. IMO

03-24-2012 07:06 PM

cxa0897

Re: Pencil and Paper 101

its a sticky man, its meant to be bumped

03-24-2012 06:53 PM

SINTORMAN

Re: Pencil and Paper 101

Quote:

Originally Posted by jburt420

this is great!

dude... don't bump old threads.

03-24-2012 05:15 PM

jburt420

Re: Pencil and Paper 101

this is great!

08-08-2011 11:15 PM

charlie1017

Re: Pencil and Paper 101

awesome, i'm glad i found this website. thanks.

02-09-2011 02:48 PM

Burkem_10

Re: Pencil and Paper 101

thanks

02-09-2011 02:47 PM

Burkem_10

Re: Pencil and Paper 101

Its funny how people act like subwoofers and boxes aren't complicated..

02-09-2011 01:56 PM

sniper_rs

Re: Pencil and Paper 101

many thanks

04-11-2010 01:38 AM

03protege

Re: Pencil and Paper 101

Quote:

Originally Posted by -0nes-

every sounds great if only there wasnt so much math in volved but this should come in handy tomorrow thanks

Subwoofer Enclosure Calculators, Fraction to Decimal, Parallel, Series, Port Length and Volume Calculators

this can help check some of the math for you

04-11-2010 12:14 AM

-0nes-

Re: Pencil and Paper 101

every sounds great if only there wasnt so much math in volved but this should come in handy tomorrow thanks

02-12-2010 06:29 PM

zlibby76

Re: Pencil and Paper 101

Thanks.

07-08-2009 09:55 PM

fosg8freak

Quote:

Originally Posted by Used2Know

Nice job! Mind pming me that worksheet?

I attached it, via a zip file...

04-24-2009 07:24 PM

fosg8freak

Quote:

Originally Posted by Used2Know

Nice job! Mind pming me that worksheet?

Im not extremely confident in the accuracy of it, but Ill send you what I got. I spent a few hours putting things in, putting in real life numbers and comparing to make sure everything was ok.. and then on the ones that were not simple math I used bbp6 to compare and they seemed very close. Ill go get the file and send you a pm.

04-24-2009 04:01 PM

Used2Know

Quote:

Originally Posted by fosg8freak

I finally got off my lazy ass (hypothetically speaking) and entered that tuning frequency formula into Microsoft Excel, then I did all the formula's for volume, port area recomendation, external dimension calc, ect.

You just feel good about yoruself when you make the formula's yoruself then connect everything up in excel

Nice job! Mind pming me that worksheet?

04-24-2009 04:00 PM

Used2Know

Quote:

Originally Posted by Grizzleyadams69

this guide doesnt state HOW to make a port 5% of the speed of sound. i have no idea how adjusting port size, width, length, etc would affect the speed of the port. can someone explain this for me please? is there a formula?

The formula provided via this sticky does give you the "best" minimum port diameter... which you can covert to cubic inches to get a general idea. Model the vent velocity in an acceptable program such as Bass Box Pro or even WinISD. You can go a little higher up to mid 20s m/s without a “noticeable” amount of port noise, even up to 35 m/s max (10% mach aka speed of sound) if space of the enclosure size is a major concern. Although disregarding aero ports (you can get away with even a tad more), obviously the lower the vent velocity the better... I stated via the thread the most opportune vent velocity which is roughly 5% mach, but can often be hard to accomplish in mobile audio. Those programs I mentioned will show vent velocity given your port area, power applied and such.

04-24-2009 02:11 AM

Grizzleyadams69

Quote:

shoot for 5% of speed of sound (</ 17 m/s) and you wont have any problems

03-21-2009 08:18 PM

fosg8freak

12-05-2008 05:07 AM

Used2Know

Quote:

Originally Posted by 2400watts

i am so lost im trying to tune my box to 35hz w/ a 6 cu ft box
any help from anybody would be fine... its just so confusing

Shoot me a PM.

12-03-2008 07:26 PM

2400watts

i am so lost im trying to tune my box to 35hz w/ a 6 cu ft box
any help from anybody would be fine... its just so confusing

08-04-2008 04:57 PM

kensaudio99

Hi! Is this the formula for calculating the port displacement?
length * width * height / 1728 = Ft3

Slot Port Displacement

calculate the internal volume inside the port as well as the volume of the wood making the vent wall(s) for the port and then subtract that from the internal volume of the enclosure
length * width * height / 1728 = Ft3

06-16-2008 03:19 PM

kensaudio99

Nevermind! I got it.

05-17-2008 09:00 PM

kensaudio99

What does this mean? * ^

03-31-2008 01:10 PM

Used2Know

Quote:

Originally Posted by Coolwazabi

um... you have the english version ?

good stuff.. just little confused on aero ports..

check out subwoofer builder...

03-31-2008 12:40 PM

Coolwazabi

um... you have the english version ?

good stuff.. just little confused on aero ports..

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