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View Full Version : TC Sounds LMS 15 :: 20 ft^3 :: 22hz



DJ Nitrous 427
04-30-2009, 01:55 PM
I measured the T/S parameters myself for this sub and plugged them into TermLab's box program. It wont let me screen capture the response graph but here are the numbers :

-3.0 db : 14.5 hz
0.0 db : 18.5 hz
3.3 db : 20.1 hz
4.6 db : 22.0 hz
4.7 db : 23.1 hz
4.8 db : 27.8 hz
4.9 db : 30.5 hz
4.9 db : 32.0 hz
4.8 db : 33.5 hz
4.7 db : 35.1 hz
4.6 db : 36.8 hz
4.0 db : 42.3 hz
3.5 db : 46.4 hz
3.0 db : 50.9 hz
2.6 db : 55.0 hz
2.0 db : 64.0 hz
1.5 db : 73.9 hz

So:
Cutoff : 17.5 hz
0 db : 18.5 hz
3 db up : 20 hz
~ 4.8 db plateau : 22hz to 36.8 hz
slope back 3db up : 50.9 hz

According to the program (2) 6" aero 6" long would give me the tuning I want with a vent velocity of ~8%. You think thats enough port area?

DJ Nitrous 427
05-03-2009, 12:02 PM
noone have any input?

DJ Nitrous 427
07-10-2009, 09:41 AM
bump

dappa5
07-10-2009, 11:21 AM
it's on the small end of port aera 226 ish (12-16 in^2 per ft^3 ) but aeros are more efficient so i think you should be fine

hopefully some others will agree

Skip01
07-10-2009, 11:33 AM
This is for a HT setup?

DJ Nitrous 427
07-10-2009, 03:03 PM
naw my truck

SomeDonnieDude
07-10-2009, 03:59 PM
Looks like a sick low end!

Skip01
07-10-2009, 04:59 PM
naw my truck

20cu for a single 15?

Or how many?

DJ Nitrous 427
07-10-2009, 05:06 PM
yup...just 1 15

812mcmurray
07-10-2009, 05:10 PM
my god lol

RAM_Designs
07-10-2009, 05:12 PM
Goodbye mechanical power handling!

bumpin buick
07-10-2009, 05:13 PM
a single 15 can get loud.... real loud ;)

DJ Nitrous 427
07-10-2009, 05:13 PM
lmao...should sound good...not worry about how loud it gets

DJ Nitrous 427
07-10-2009, 05:16 PM
its a single 4 ohm coil... i got a soundstream pca2.760 .... bridged itll get 760w

Skip01
07-10-2009, 05:21 PM
So youre going with a box 4x the recommended size?

Why?

eutechnyx
07-10-2009, 05:22 PM
That seems excessive.

revrider1
07-10-2009, 05:22 PM
Thats a huge box...

Xprime4
07-10-2009, 05:26 PM
i can understand the need of rumbling lowend bassline in ht... but not sure it will sound that great on music... if you ever hear it lol

RAM_Designs
07-10-2009, 05:29 PM
With a box that huge, group delay will be pretty noticeable.

bumpin buick
07-10-2009, 05:30 PM
So youre going with a box 4x the recommended size?

Why?

efficiency is the only conclusion i can come to

DJ Nitrous 427
07-10-2009, 05:41 PM
the sub
http://i3.photobucket.com/albums/y54/DJNitrous427/Subs/TC%20LMT%2015/DSC00759Small.jpg

this is why I asked for opinions...

whats group delay?

the very low end is at 5db+
at 50hz ( the top of what I consider bass) is still 3db+

at 4cubes the box was very peaky

Skip01
07-10-2009, 05:44 PM
the sub
http://i3.photobucket.com/albums/y54/DJNitrous427/Subs/TC%20LMT%2015/DSC00759Small.jpg

this is why I asked for opinions...

whats group delay?

the very low end is at 5db+
at 50hz ( the top of what I consider bass) is still 3db+

at 4cubes the box was very peaky

Peaky in the in-car environment or just in that program?

That sub is nasty haha

chriswho
07-10-2009, 05:45 PM
nice sub

mlstrass
07-10-2009, 08:36 PM
that's even big for a 15 in a HT set up. I have my 15" RL-P's in 10 cubes each tuned to 17.5Hz and they slam off 400watts each.

That enclosure wouldn't be good for a car environment....

Fuknmovin
07-12-2009, 11:33 AM
it's on the small end of port aera 226 ish (12-16 in^2 per ft^3 ) but aeros are more efficient so i think you should be fine

hopefully some others will agree

Call me crazy but I think you used the diameter not the radius of the port to come up with that figure, seems WAY too high....

dappa5
07-12-2009, 12:43 PM
Call me crazy but I think you used the diameter not the radius of the port to come up with that figure, seems WAY too high....

your half right i meant to tell him to use 4 aeros lol
so i guess it did look like i used dia lol

was bad math srry

dappa5
07-12-2009, 12:46 PM
2 6 in will whistle "like a gay french man" (got that from some one sig lol)
maybe 8 ?

Fuknmovin
07-12-2009, 12:53 PM
LOL...it will definitely make some noise..