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
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
Attachments
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..
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..
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
like this : pic - 2 -
An externally hosted image should be here but it was not working when we last tested it.
tamir
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.
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.
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.
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.
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.
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.
SPL competitions....
i want to build a car box like this : http://www.powered4sound.com/store.html
can anyone help to plan the box...?!
tamir
i want to build a car box like this : http://www.powered4sound.com/store.html
can anyone help to plan the box...?!
tamir
First off, you need to decide weather you want a box you can listen to music on or compete in competitions with. You can't have it both ways (99.9% of the time anyways). I have never personally heard an enclosure built for extreme SPL that you could actually listen to music on.
At 136db your about 20db away from being able to compete and win in any real SPL comps.
As far as those snail shell boxes go, I've heard good things about them for music applications and their supposedly louder than a ported box tuned for music, but it wont bring you home any SPL trophies.
At 136db your about 20db away from being able to compete and win in any real SPL comps.
As far as those snail shell boxes go, I've heard good things about them for music applications and their supposedly louder than a ported box tuned for music, but it wont bring you home any SPL trophies.
I'm sure his aim is simply to get more than what he already has, he's just not aware that no way is he getting 135dB/1m at present. 135dB/1cm maybe.
What he needs is more woofers, more amps, and he needs to fill all the empty space in the car's doors and frame and body with concrete.
136db is not an incredible amount for car audio. The unknown woofers playing this loud does make it harder to believe however. If it were me, I would go with some better drivers, perhaps ones that have a brand name and hopefully some credibility. The adire audio brahmas are GREAT car audio subs and will surely give you an extreme amount of SPL. This quote comes from adire's website....
"Bill wanted some wicked bass, and after talking a bit with Madman Marshall he ended up with a Brahma 15 in a Ford Focus. With a low 24 Hz tune it sounds absolutely fabulous. And with 1100W of power from a DEI1100d powering it, cranked out over 140 dB SPL at 31 Hz (LOW frequency for a big SPL score), and peaked at 149 dB SPL higher up. Definitely an impressive system!"
149db with a single 15 is quite impressive.
If your still gung ho about a new box and think that will do the trick for you, I'd say ported tuned between 30 and 40hz to your taste. If you want the boomiest loudest bass you can possibly get, tune to the resonant frequency of your vehicle's interior. From what I've heard this is typically around 50 or 60hz. That is very high to tune and I wouldnt suggest playing any sort of music through the sub. Only test tones from tuning frequency on up. You'll need a serious subsonic filter if you want to play anything else and it will most definately sound like @$$
"Bill wanted some wicked bass, and after talking a bit with Madman Marshall he ended up with a Brahma 15 in a Ford Focus. With a low 24 Hz tune it sounds absolutely fabulous. And with 1100W of power from a DEI1100d powering it, cranked out over 140 dB SPL at 31 Hz (LOW frequency for a big SPL score), and peaked at 149 dB SPL higher up. Definitely an impressive system!"
149db with a single 15 is quite impressive.
If your still gung ho about a new box and think that will do the trick for you, I'd say ported tuned between 30 and 40hz to your taste. If you want the boomiest loudest bass you can possibly get, tune to the resonant frequency of your vehicle's interior. From what I've heard this is typically around 50 or 60hz. That is very high to tune and I wouldnt suggest playing any sort of music through the sub. Only test tones from tuning frequency on up. You'll need a serious subsonic filter if you want to play anything else and it will most definately sound like @$$
136dB it is alot in israel.......
the best is 141dB.
becouse we dont have alot of subwoofer choice.
it is all expensive.
so i get the idia if i change the box i get more SPL.
tamir.
the best is 141dB.
becouse we dont have alot of subwoofer choice.
it is all expensive.
so i get the idia if i change the box i get more SPL.
An externally hosted image should be here but it was not working when we last tested it.
tamir.
So basically what this is saying is that the accepted methods of determining the output of a loudspeaker system referenced to db/1meter are not used in autosound competition, which is understandable considering the circumstances. However it also renders it next to impossible to make any definitive comparisons between components, since not only is response completely dominated by cabin gain but there is no cabin size standard. Simply put, if you want it louder, don't get a bigger speaker, get a smaller car.
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