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View Full Version : 146 db from a bmw 3 series trunk!!!



double 07
04-20-2012, 09:10 PM
This is my demo car....It used to have 1 Havoc 12" sub facing the rear...I am trying something new... I am working on custom hinge system to motorize rear seat...This sub and amp combo is temporary...I have another 12" Havoc in route for a combination of two and a DC Audio 3.5k (5k later).........The current setup done a 146.3 @ 53hz with an AB VFL 120.1 clamped at 1332 watts at 2.2 ohms.....I do have an XS Power D3100 wired in parallel with my stock battery in trunk.. I have a stock alternator for now (mechman in works)..


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R34P3R
04-20-2012, 09:16 PM
Very respectable for a single 12" havoc even though you are tuned in the 50's. How does it sound on music?

double 07
04-20-2012, 09:25 PM
The box is tuned to 39........It peaked at 53......The two 12" XDs done the 146.....Unfortunately I never metered the single Havoc but it wasn't nowhere near this loud...It actually sounds pretty good on music.......It done a 144.3 on Chris Brown's "Look at Me Now"

05fronty
04-20-2012, 09:35 PM
not bad, more powah haha. i haven't metered my ns, but my last setup was a pair of sa-15's on a discus 1500 that did a 49.5 like at 56hz

bgowdy31
04-20-2012, 09:37 PM
nice score. hell i wish i could do 46. i dont understand what im doing wrong but i guess ill eventually figured it out

double 07
04-20-2012, 09:39 PM
nice score. hell i wish i could do 46. i dont understand what im doing wrong but i guess ill eventually figured it out

Drive it down here to TN and we will figure it out!!!!!!!! lol

bgowdy31
04-20-2012, 10:07 PM
Drive it down here to TN and we will figure it out!!!!!!!! lol

gas to high... i drive a blazer lmao

Buck
04-20-2012, 11:50 PM
Drive it down here to TN and we will figure it out!!!!!!!! lol

Reppin' TN yo!

kushy_dreams
04-21-2012, 12:49 AM
Very good score for some < $100 subs imo

Whats the volume and tune on the box and what were they wired to before rise?

Kangaroux
04-21-2012, 01:16 AM
Very impressive score indeed, especially coming from a trunk

double 07
04-21-2012, 04:05 AM
Very good score for some < $100 subs imo

Whats the volume and tune on the box and what were they wired to before rise?

The box is 3.5 cubes net after all displacements tuned to 39 hz with 20 inches of port per cube.........They are wired down to 1 ohm before rise........

kushy_dreams
04-21-2012, 02:31 PM
What kind of car was it in?

Does a smaller box yield less imp rise? Or are there too many other factors? Most setups I have seen are getting close to 3x the rise of the nominal impedance.

kushy_dreams
04-21-2012, 02:31 PM
dbl poast

pr-festiva
04-21-2012, 02:34 PM
a smaller box will most of the time cause a higher impedance rise

pr-festiva
04-21-2012, 02:34 PM
double post

double 07
04-21-2012, 02:55 PM
2000 Bmw 323i................

Vossy
04-21-2012, 03:02 PM
Not shabby, I also have a 3 series. Just about doing 50's at 37 hz here :p

RAM_Designs
04-21-2012, 03:24 PM
a smaller box will most of the time cause a higher impedance rise

You have that backwards.

pr-festiva
04-21-2012, 03:29 PM
looks like i'll have to clamp the new box and see cause ive had multiple people respected in the industry tell me different

RAM_Designs
04-21-2012, 04:14 PM
looks like i'll have to clamp the new box and see cause ive had multiple people respected in the industry tell me different

Weird, it turns out after searching that people say one thing or the other...doesn't seem to be a consistent rule(maybe there isn't a rule?). I had always heard from serious competitors that smaller box = less rise...never really tested it myself since i just dealt with daily boxes and didn't really care. But after doing a simple google search I found just as many positive results for "small box less impedance rise" as I did with "small box more impedance rise."

Let us know what result you come up with.

RAM_Designs
04-21-2012, 04:15 PM
looks like i'll have to clamp the new box and see cause ive had multiple people respected in the industry tell me different

Weird, it turns out after searching that people say one thing or the other...doesn't seem to be a consistent rule(maybe there isn't a rule?). I had always heard from serious competitors that smaller box = less rise...never really tested it myself since i just dealt with daily boxes and didn't really care. But after doing a simple google search I found just as many positive results for "small box less impedance rise" as I did with "small box more impedance rise."

Let us know what result you come up with.

pr-festiva
04-21-2012, 04:26 PM
yep ive seen the same differing answers,,, time for some real world testing :) thats what i like about this hobby

double 07
04-24-2012, 10:47 PM
Hopefully my two AA Havocs will be here by the end of the week so I can wire that VFL 120.1 down to 1/2.......See if I can get a 148.........lol

double 07
05-06-2012, 08:58 PM
Got my Havocs in.......SPL went down just a little along with my PEAK........The Havocs done a 145.8 @ 49 hz but they sound so much better than the ABs....Thanks AA........I can't wait until my new DC 3.5k gets here!!!!!!!


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Fi_
07-25-2012, 10:32 PM
What kind of car was it in?

Does a smaller box yield less imp rise? Or are there too many other factors? Most setups I have seen are getting close to 3x the rise of the nominal impedance.

Yes it yields less impedance rise there are many other factors but is one of the bigger ones.