Quarter Wave / T-Line tutorial-UPDATED

[xXxOuTLaWxXx]

You just have to keep the same port area through out the whole line. I have read all 40 pages of this and don't understand why there are so many of the same questions when it has been answered many times over. Read the thread and you'll know everything Bumpin has tried to teach you. You can't expect to know anything if you don't try to learn it first.

[Pimpalero2003]

Understand it but haven't read it all. But does it matter where I mount the sub trying to figure out how to get the port through either arm rest or through rear deck.

[kirill007]

uh...

its a lot easier to just take the radius (4, half of the diameter) and punch that into A=TTr^2

3.14 x(4^2) = 50.24

You do know he does exactly the same thing?

He says = r² x pi

[STEvil]

You do know he does exactly the same thing?

He says = r² x pi

yup.

[nCOMP1337]

here is my box design for a 12 inch FI SSD T-line, cone diameter is estimated at 11.5, actual sub wont be here until tuesday, but this gives me an idea

[baaudio]

15" L7 in a t-line. i figured why not try it. but im still kinda confused. id like the sub n port to be on the same face. basically max dimensions width is 41" depth 30" (ill account for port width) height up to 20" (can go higher but hopefully dont need to). sd=156.25 fs=30 qts=.507. would it even be a good idea to try this? or you guys think put it in a ported and slam it?

so my math gives me 155 in^2 port, and 9.5' long. sound right?

heres the box design. sub inverted. 41" wide, 21" tall, 26" deep

[Basshead15]

Ok I'm slightly confused. ha.

So I'm wanting to use a SS T5, fs=30.7, sd=83.7, & diameter=10.32. I was tuning the t-line to 30 and I came up with around 83in^2 port length & 9'41" long??? So am I on the right track?? Then I came up with 167sq Inches and 9.25 ft long port. I'm seriously confused now...Anybody got some Help/Input??

[nCOMP1337]

fs=30.7, sd=83.7, & diameter=10.32.

based on Fs, at a 1/4 wave for 30 Hz it should be 1130/30 which is 37.67 ft then divide that by 4 to get your 1/4 wave, which is 9.42 ft when rounded up, so this would be the length of the port needed to tune it to 30 Hz

if the diameter is 10.32 then divide this by 2 to get the radius which is 5.16 then multiply by 5.16 and then again by pi which is 3.14 rounded which gives you 83.6 when rounded, this would normally be rounded to a whole number like 84, based on sizing issues you want to keep the port area close to this number but going a little high or lower shouldnt affect it too much, example if it ended up being 85 or 80 instead of 84, im guessing the 167 sq inches you found would be if you had two of those subs in the t-line

so it looks like your first calculations for a single sub were right on

[Basshead15]

fs=30.7, sd=83.7, & diameter=10.32.

based on Fs, at a 1/4 wave for 30 Hz it should be 1130/30 which is 37.67 ft then divide that by 4 to get your 1/4 wave, which is 9.42 ft when rounded up, so this would be the length of the port needed to tune it to 30 Hz

if the diameter is 10.32 then divide this by 2 to get the radius which is 5.16 then multiply by 5.16 and then again by pi which is 3.14 rounded which gives you 83.6 when rounded, this would normally be rounded to a whole number like 84, based on sizing issues you want to keep the port area close to this number but going a little high or lower shouldnt affect it too much, example if it ended up being 85 or 80 instead of 84, im guessing the 167 sq inches you found would be if you had two of those subs in the t-line

so it looks like your first calculations for a single sub were right on

Alright thanks man.

at first I was like wtf, how the hell did i mess up so bad. ha

[STEvil]

Anyone think I should build t-line for a Pyle 21?