bma

jlukja

I think I'll be able to hear it here in LB if you crank it.

CGTSX2004

iTrader: (1)

Nice!!

But what is that first picture of?

teg_to_bike

Is that a "stereo system that's so loud it will blow women's clothes off" -- Italian Job

Tsx536

Funny! I just watched that movie again the other day.


Is that a TSX? I can't quite tell

DEI99662

Looks good. Have you tested it yet? What is the dB level at?

elduderino

Wow, you could be the best custom shop in NYC : )

Turned out very well.

... out of curiousity, I would've liked to see inside the box, because from the first photo it seems that you did beautiful glass work on the bottom, but may not have taken full advantage on the rest of the enclosure. I personally think that a 3/4" baffle might have been all the wood you needed, and the rest could've been glass and the final resin/sawdust/sand mix. Nice to save weight... but a good job, no doubt.

Also, since it seems to be a single airspace on the box, what is the tuning frequency for those ports? And is there a subsonic filter on the sub amp?

blackjackman

that looks rather yummy

sipark

I thought it was

elduderino

Dude, that is f*ckin' gorgeous.

xizor

from the taillight, doesn't look like it

teg_to_bike

looks like a G2 TL?

zazen721

mmmm a very large cinnamon bun =)

elduderino

Trunk hinge looks like it.

iamhomin

Yeah, it's the G2 3.2 TL.

musicbox

It looks nice, all your own work?

I'm curious about the enclosure, I can't tell by the picture, but it looks like all resin and no glass(or fabric or anything)? But maybe it's just the picture.

98EXL

looks badass!

elduderino

Yeah, good point. NIce masking job, and, looks pretty clear. THis could have been addressed later in the job by filling the enclosure in fron the woofer hole with additional layers of glass, right?

bma

I have done this with my installer. It took us 1 week to do it. The first pic. show the bottom of the box. It is 12 layers of resin and fiberglass. 3 10' sub fits on the top of it, and it has 2 4' port (6' deep). Yes it is a 3.2 TL. Didn't really test the dB. But it's damn loud !!!

elduderino

Did you guys figure the enclosure size? Do you know what note the box is tuned to? And so there IS fiber in the mix of the box?

bma

The enclosure is 3.5 cubic feet. I'm not quite sure what's the note of the box tuned to. And this is a mixture of fiberglass and MDF box. This is the only way I can get the maxmium enclosure.

elduderino

No, I like the galss, I think you could have used more of it and less MDF, but the box looks like (in that one photo) it's all resin and no fiber.

If your gross volume is 3.5 cubic feet, and we assume your 10" woofs displace about .05 feet each (.15 total for 3), and your two 4" diameter 6" long ports displace a total of a hair under 0.1 , then you have 3.25 feet net left over.

If we use some common online software programs to calculate this, they say that buried in the center of a football field, your box should be tuned to 50 Hz.

Don't know what it's really tuned to in the car. If it is 50 Hz, then your vented-box power handling doesn't seem too high. Vented boxes "unload" at 1/2 octave below the tuning freq, and act like there's no enclosure at all - which in this case is 25 Hz, which is low enough where we probably don't try to play it ever unless you listen to whale mating calls or digitally-recorded organ playing.

If it's much higher than 50 Hz, then you could have a power handling problem, but sounds like it's not.

Congrats on a good enclosure.

And that, boys and girls, is why ported boxes can rip your head off - when done right.

Bass Mechanic

good observations eludo, you right on track. i havnt run thoes numbers yet but with dual ports and as large as they are i can assure you that that setup is tuned WAY too high. in fact i bet you its closer to about 60 hz. that setup is definitly going to allow the subs to reach xmax way sooner than they should below the tuning frequency. in fact im going to run a simulation right now. in curious to see what the vent velocity and xmax would be below say 40 hz.
ill brb to post my findings.

Bass Mechanic

well i found thoes subs at http://www.boschmanusa.com/index.asp interestingly enough they dont list their T/S parameters so i cant do an accurate responce graph. but considering their power handeling capacity and the fact that they are a stamped steel frame and the fact they are only cost 100 bux for a 300 watt RMS sub tells me they dont have the most xmax to be found with most brands.
so just shooting from the hip and using my software and just using a comparable 10" sub i picked a JL W3 the tuning frequency is about 45 hz and unfortunatly there is a HUGE spike gain at 50 hz that has more than 9 db than any part of the entire responce curve. this is definitly a 1 note wonder. the cabin gain keeps the low end fairly strong but the cones will far exceed their xmax below 30 hz. i dont know how many watts he is running to them but when they unload below 30 hz they wont last long. i know using a different sub isnt going to be entirely accurate but for the sake of argument on tuning frequency it shouldnt be too far off. i would like to get the T/S for thoes subs to do a more accurate assesment of that system.

of course i also wonder how far from the bottom of the enclosure thoes ports are. it doesnt look like there was enough room for an elbow. if they are straight im sure that they arent at least 4 inches from the bottom as is required for proper unobstructed airflow. this would also reduce the tuning frequency a tiny bit but still not enough to lower the tuning frequency enough to save thoes subs from over excursion.

you know the more i look at that enclosure though hard to tell i cannot belive that thing is 3.5 cubic feet. ive built a lot of boxes and it lookes closer to about 2.5 cu ft to me. but i dont have anything to reference it to. i know my old 2001 TL the spare tire well couldnt have been more than 20 inches wide and i know it was probly as long as perhaps 30 inches. couldnt have been more than 6 inches deep. that would equate to exactly 2.0 cu ft. i see they added a couple inches to the height of the enclosure with MDF and that may bring it to approximatly 3 cu ft. if the airspace is less than 3.5 it would be a lot higher tuning frequency than that. my software shows with thoes 3 subs and port displacement the actuall airspace is only 3.2 cu ft even if you started with 3.5 in the first place.
if the enclosure is anywhere close to 3.0 cu ft the tuning frequency jumps to 50 hz

i have to say its a very nice install. however it's unfortunate that it appears they were going for looks and like so many stuffed way too many subs in too small of a space and sacrificed the correct alignment of the enclosure in favor of stuffing more subs into it as well as tuned it too high to get the ports to fit.

elduderino

Well, I agree with the tech stuff, but based on my experience, they did OK. I think he may be at 50 Hz, but in a car that's often functional.

I have no reason to think they were shooting for SQ, and "one-note" bass is a dream of many of these guys. I bet they're right, it is really loud, and it's gotta be rewarding to have a box go off like that.

How often is someone going to get audio information below 30Hz? I honestly doubt that the box tuning is too high from a power handling perspective. For rap listeners, the peaks are well above taht, and this box probably plays them very well. I think they may have gotten lucky (hard to tell - installer may have done the work, he did do the measurement), but lucky or good, that's a good tuning note. We may have chosen a different one for SQ purposes, but I doubt that was the aim.

All these sealed box systems, and a pretty-well-executed ported one comes along, ya gotta be a little nicer to them, ya know? : ) Gotta enroll more people to doing the ports...