Quarter Wave / T-Line tutorial-UPDATED

[vad333]

is the eclosure tapered? "chocked"?

[ChevyBoy]

whats all over your box? i bet that bish dont leak.

[Forevrbumpn]

The box up there is my buddies, the design I gave him was just a common constant line, tuned at 38hz....

And Vad, The Fs of the driver, and the quarter wave of the box are all off, 70" is only 48hz or so, so basically you dont have a tline at all, just a 48hz ported box. To match the Fs of the driver, well you need a much longer line, like 125" long for 27hz

BUT, you can save yourself here, try filling the line with fiberglass, or polyfill, untill it sounds better. Loosely filling it evenly all the way thru the line should get the tunning to drop alot

[LSN2meBoom916]

<--Just reread the 1st page/math section. I think I get it too! :w00t:

<----Soo gonna try this and u bet I'll have pics/let ya know how it goes.

One Q: One the little "V's" to "keep the waves from destroying each other..." I just dont see the location of them from the pics. My setup will be undoubtedly multiple woofers so I'm curious.

I have some EMT 6's i wanna try, some CVR 8's I think might be fun, and damn near a dozen 10's to play with.

I shall be borrowin ur ear/brain at Autoramma if I can catch up to ya (And get the days off werk!)

I was wondering if a decent pair or 2 pair(4) 12's setup could do over 150db on music /daily in a setup like this? And in a hatchback w/ about 9cft? (Integra)

AWSOME TUTORIAL BTW.

[vad333]

do you think ill be ok with 105" length?

[stratusrt01]

There's a little pic of the one I built, for what it is, it's amazing.  I wish I could fit one in my car for my SI Mags......... :^

[Forevrbumpn]

well, how much room do you have back there?

[stratusrt01]

well, how much room do you have back there?

Not enough for 4 12's in a TL........ :^

36x16x30, and that's my entire trunk, front to back

[LSN2meBoom916]

Man I think i'm stuck here.

On the 1st page where does the 160in^2 of port come from?

SD of a single 12 would be (3.14)(radius^2) which is 6^2=36...36x(3.14)=113.04. DOUBLE that=226.08...? where does the 160in^2 come from?

I'm lost on that part.

BTW I'm just trying to fig out a Tlinebox for a single HCCA10D2 (same as for sale in that section but I wont run it unless no one buys it).

I found these specs for it:

Qts=0.43

Qms=4.87

Fs=42hz

Sd=50in^2

So according to ur math:

1130/42=26.90 = 1 wavelenghth

26.90/4=6.72 = 1/4 wavelength

so port should be 6.72ft long.

Sd= 50in^2

soo...Port should be 50in^2 also?

Please

[stratusrt01]

That's correct.