High SPL Car Horn Subwoofer

Astro Power · 2nd November 2004, 12:43 PM

Hii All.

a Have in my car 2 Subwoofer from unknow compeny.

i have them in my car in ported box. in my last check the "dB geometer" is show a 135.5dB. now i want to change my box to
a hornbox to get more SPL........
how much DB the horn box will give me ?!

my 2 subwoofers is:
12'
350WRMS 700WMAX
4 OHM

my box is the (1) and i want to change to something like (2) but i dont now how to make it in the theory...??
practicably i can do this........

thanks
tamir

Astro Power · 2nd November 2004, 01:45 PM

(1)+(2)

DigitalJunkie · 2nd November 2004, 02:38 PM

Maybe something like the "Wicked One" on Decwares site?
Have a look..
http://www.decware.com/whorn.htm
I once planned to build one of these,and had the plans scaled up for a dual 12 inch version,but lost them a while ago..

Astro Power · 2nd November 2004, 02:58 PM

and if i build this but the subwoofer is outside and the port is the horn can i get a 140dB ??? in the ported i get a 135.5dB.

like this : pic - 2 -

tamir

Jim York · 2nd November 2004, 04:22 PM

You won't get much more with a rear horn because it only loads the rearwave of the driver; there will be additional bass extension, but not much, maybe a dB or two, as a horn that will work to 40 Hz has to be at least seven feet long. With your design that means the box would probably be larger than your car. I built an AutoTuba, which does have a seven foot horn in a box that will fit in a car trunk, you can see it at www.billfitzmaurice.com. It is the most powerful sub you can get small enough for a car.

But even it won't get 135dB, and I don't know of any ported box that is capable of anywhere near that level. How are you measuring this? A typical reflex box will give about 90dB/SPL/1watt/1 meter even with cabin gain, and at 400 watts input that comes to 116dB at 1 meter. You'd need 40,000watts for 136dB.

MEXXX · 2nd November 2004, 04:38 PM

I'm sure his "db geometer" reading (whatever that is, lol) included the cabin gain of the car with the amp playing at full volume, if not clipping.

BillFitzmaurice · 2nd November 2004, 05:40 PM

I'd guess that's some sort of meter along the Rat Shack lines, and what he reads depends on wherehe puts it. 135dB is easy two inches from the box, ain't never gonna happen a meter away. Or he may be reading total system response, not that of the sub only, making the reading meaningless as far as the sub alone is concerned.

Astro Power · 2nd November 2004, 06:15 PM

yes yes it is device that check your MAXIMOM DB in the front of the car...... so i get a136DB...

i dont now how to say the name of the DB check dvice......sorry.

so the horn will be in tune to the front of the car......

i dont how to say it.....

but......the space in the trunk is open to the other space in the car.

Luke (Uof Iowa) · 2nd November 2004, 07:02 PM

Quote:

Originally posted by MEXXX
I'm sure his "db geometer" reading (whatever that is, lol) included the cabin gain of the car with the amp playing at full volume, if not clipping.

Agreed.

Svante · 2nd November 2004, 08:52 PM

Why on earth would you want 136 dB?

2nd November 2004, 08:52 PM	#10
Svante diyAudio Member Join Date: Feb 2004 Location: Stockholm	Why on earth would you want 136 dB? __________________ Simulate loudspeakers: Basta! Simulate the baffle step: The Edge

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2nd November 2004, 01:45 PM	#2
Astro Power diyAudio Member Join Date: Sep 2004 Location: Binyamina	(1)+(2)

2nd November 2004, 02:38 PM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Maybe something like the "Wicked One" on Decwares site? Have a look.. http://www.decware.com/whorn.htm I once planned to build one of these,and had the plans scaled up for a dual 12 inch version,but lost them a while ago..

2nd November 2004, 02:58 PM	#4
Astro Power diyAudio Member Join Date: Sep 2004 Location: Binyamina	and if i build this but the subwoofer is outside and the port is the horn can i get a 140dB ??? in the ported i get a 135.5dB. like this : pic - 2 - tamir

2nd November 2004, 04:22 PM	#5
Jim York Banned Join Date: Oct 2004	You won't get much more with a rear horn because it only loads the rearwave of the driver; there will be additional bass extension, but not much, maybe a dB or two, as a horn that will work to 40 Hz has to be at least seven feet long. With your design that means the box would probably be larger than your car. I built an AutoTuba, which does have a seven foot horn in a box that will fit in a car trunk, you can see it at www.billfitzmaurice.com. It is the most powerful sub you can get small enough for a car. But even it won't get 135dB, and I don't know of any ported box that is capable of anywhere near that level. How are you measuring this? A typical reflex box will give about 90dB/SPL/1watt/1 meter even with cabin gain, and at 400 watts input that comes to 116dB at 1 meter. You'd need 40,000watts for 136dB.

2nd November 2004, 04:38 PM	#6
MEXXX diyAudio Member Join Date: Oct 2004	I'm sure his "db geometer" reading (whatever that is, lol) included the cabin gain of the car with the amp playing at full volume, if not clipping.

2nd November 2004, 05:40 PM	#7
BillFitzmaurice Banned Join Date: May 2004 Location: New Hampshire	I'd guess that's some sort of meter along the Rat Shack lines, and what he reads depends on wherehe puts it. 135dB is easy two inches from the box, ain't never gonna happen a meter away. Or he may be reading total system response, not that of the sub only, making the reading meaningless as far as the sub alone is concerned.

2nd November 2004, 06:15 PM	#8
Astro Power diyAudio Member Join Date: Sep 2004 Location: Binyamina	yes yes it is device that check your MAXIMOM DB in the front of the car...... so i get a136DB... i dont now how to say the name of the DB check dvice......sorry. so the horn will be in tune to the front of the car...... i dont how to say it..... but......the space in the trunk is open to the other space in the car.