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jeremiah
10-20-2006, 12:36 AM
if i build a 2 cu.ft ported box tund to 40hz with a 6" round port how long would
the port half to be?

danteBirosel
10-20-2006, 12:38 AM
Assuming this is for one 12" sub, u will need a straight length of 19"

jeremiah
10-20-2006, 12:42 AM
19"!! :( what about a 4" port

Big Dee
10-20-2006, 01:00 AM
19"!! :( what about a 4" port

If the net volume is 2 cu ft then you need a length of 7.45".

jeremiah
10-20-2006, 01:06 AM
do you think it would have better SPL than my slot port box tuned to 32?

Big Dee
10-20-2006, 01:19 AM
Above 40 hz, yes, below 40 hz, no. It's a trade off, you will gain some and lose some. If you're going after pure SPL than yeah, you will gain more raw SPL at around 50 hz.

jeremiah
10-20-2006, 01:21 AM
it's the moe lester( 2 @ 32 #1 box plan)

jeremiah
10-20-2006, 01:28 AM
Above 40 hz, yes, below 40 hz, no. It's a trade off, you will gain some and lose some. If you're going after pure SPL than yeah, you will gain more raw SPL at around 50 hz.

how many more db would i get

mattf
10-20-2006, 01:29 AM
how many more db would i get
27

jeremiah
10-20-2006, 01:34 AM
27


:eyebrow: be serious

danteBirosel
10-20-2006, 01:35 AM
it really depends on the setup and the car bro. U cant just expect someone to throw out a number and expect that ur going to that much instantly.


It's all on the setup.

springy101
10-20-2006, 01:36 AM
you cant tell. and taht box will get loud but sound like assholes

danteBirosel
10-20-2006, 01:36 AM
Above 40 hz, yes, below 40 hz, no. It's a trade off, you will gain some and lose some. If you're going after pure SPL than yeah, you will gain more raw SPL at around 50 hz.


depends on his resonant frequency. That will be the best way to tune ur enclosure.



It's all about testing testing testing testing!

Big Dee
10-20-2006, 01:39 AM
how many more db would i get

It depends on the sub. I'd say about 2dBs, but below tuning you're gonna lose more than that. Peak SPL will go up around 50 hz, but avg SPL across 20-40 hz will drop a few dBs or so.

Big Dee
10-20-2006, 01:42 AM
depends on his resonant frequency. That will be the best way to tune ur enclosure.



The subs response will do what I said, what the car does to it afterwards is a different story, but if the sub puts out more at x frequency you will see that in reality, but exactly how much is up to the setup, I agree on that.

Trust me I know about adjusting to your car, the box I'm building tommorow goes against all conventional advice, but I've measured my car's response and I know what I need.

jeremiah
10-20-2006, 01:55 AM
you cant tell. and taht box will get loud but sound like assholes

? what box moe lester's slot port box or the 2 cu.ft 40hz round port box?

Big Dee
10-20-2006, 01:57 AM
? what box moe lester's slot port box or the 2 cu.ft 40hz round port box?

I'm guessing the 40 hz tuned box. That thing would be so inaccurate it's not even funny, but I figured you were just concerned with SPL at all costs and not SQ.

prochobo
10-20-2006, 11:23 AM
depends on his resonant frequency. That will be the best way to tune ur enclosure.



It's all about testing testing testing testing!

Kinda contradicting yourself there.

Best way to tune your enclosure is testing testing testing!

There is no telling what you would gain or what you should tune your enclosure to because it highly depends on the vehicle as well has the sub itself.

woody89
10-20-2006, 11:28 AM
www.psp-inc.com