Looking for efficiency subwoofer

Cyberzim · 12th July 2009, 08:28 PM

Hello,
I have made a sound system that worked perfectly on Roskilde festival, but I could use a better subwoofer that uses less power for more or the same output. I have measured to get about 150 watt rms with the subwoofer, and have measured about 115-120db output.
Right now I have a cheap car sub, that are driving 2 x 2 ohm in bridged mode (I know that you should never use bridging with 2 ohm, but we are only using a +/- 12-13 volt supply (2 car batteries)), but I'm more looking for a like 4 x 4 ohm that gives a good output with the same amount of power.
By the way, it must be 10" and we have a 50 liter enclosure.
If you have some good suggestion please tell me and give a link to where I can buy it (Must not be to expensive).

Thanks a lot,

Simon H.A.

454Casull · 12th July 2009, 09:54 PM

The size of your enclosure is your first limit to efficiency.

Cyberzim · 12th July 2009, 09:56 PM

Well, I read in another forum that this car sub worked best in 50liter sealed enclosure, but I'm willing to change it to a ported enclosure or what else is needed for a new subwoofer to perform good.

Regards,
Simon H.A.

tinitus · 13th July 2009, 12:00 AM

For outdoor I doubt "hifi" sub driven by low power will be any good at all

Maybe better use a good woofer

Maybe even use a cheap one with small magnet for highish Q value, with some peaking around 50hz

12" VXT124 Ravemaster, 95db, from hoejtalerbutikken seem to fit your needs, 53EUR

Cyberzim · 13th July 2009, 12:05 AM

Yes you are right,
It has never been hifi bass sound but my problem is, that I think I get to little sound out of the woofer, so I would like to replace it with a better, but I don't really know what I should buy.
The major problem is, that the mid and tweeters can play louder (it's actually hifi sound, I measured with oscilloscope), so they deafen the bass to much at max volume.
I have a few parametres of the subwoofer, and my box is a 50 liter sealed enclosure, so maybe I could also get more output just by changing the enclose?
QTS = 0,52
VAS = 25,57
FS = 36

Regards,

Simon H.A.

tinitus · 13th July 2009, 12:14 AM

SPL is missing in your specs

Take a look at the Ravemaster

One problem with your car woofer could be that its made to be driven with a lot of power, and to work in a small room like a car
Even if has high mms and should have low Fs, its has not due to very stiff surround, which will need lots of power
And the high mms results in low SPL

Cyberzim · 13th July 2009, 12:58 AM

It's a china sub, so can't find anymore specs.
Is this the one you are talking about?
Ravemaster subwoofer

Regards,

Simon H.A.

tinitus · 13th July 2009, 01:02 AM

VXT124, its the 12"

Cyberzim · 13th July 2009, 01:07 AM

Thats looks like a pretty good one.
But in what type of enclosure does it perform best?
Sealed or ported?
I heard that when the QTS is higher than 0,5 it is best in sealed, and when under 0,3 or something its best for ported. So what about this one?

Regards,

Simon H.A.

Cyberzim · 13th July 2009, 01:10 AM

by the way, I can actually have a 15" subwoofer in my sound system cabinet, so maybe this is a choice, and with double coil I can get more power: 15" ravemaster

Regards,

Simon H.A.

12th July 2009, 08:28 PM	#1
Cyberzim diyAudio Member Join Date: Apr 2009 Location: Gentofte	Looking for efficiency subwoofer Hello, I have made a sound system that worked perfectly on Roskilde festival, but I could use a better subwoofer that uses less power for more or the same output. I have measured to get about 150 watt rms with the subwoofer, and have measured about 115-120db output. Right now I have a cheap car sub, that are driving 2 x 2 ohm in bridged mode (I know that you should never use bridging with 2 ohm, but we are only using a +/- 12-13 volt supply (2 car batteries)), but I'm more looking for a like 4 x 4 ohm that gives a good output with the same amount of power. By the way, it must be 10" and we have a 50 liter enclosure. If you have some good suggestion please tell me and give a link to where I can buy it (Must not be to expensive). Thanks a lot, Simon H.A.

12th July 2009, 09:54 PM	#2
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	The size of your enclosure is your first limit to efficiency. __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

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12th July 2009, 09:56 PM	#3
Cyberzim diyAudio Member Join Date: Apr 2009 Location: Gentofte	Well, I read in another forum that this car sub worked best in 50liter sealed enclosure, but I'm willing to change it to a ported enclosure or what else is needed for a new subwoofer to perform good. Regards, Simon H.A.

13th July 2009, 12:00 AM	#4
tinitus diyAudio Moderator Join Date: Nov 2005	For outdoor I doubt "hifi" sub driven by low power will be any good at all Maybe better use a good woofer Maybe even use a cheap one with small magnet for highish Q value, with some peaking around 50hz 12" VXT124 Ravemaster, 95db, from hoejtalerbutikken seem to fit your needs, 53EUR

13th July 2009, 12:05 AM	#5
Cyberzim diyAudio Member Join Date: Apr 2009 Location: Gentofte	Yes you are right, It has never been hifi bass sound but my problem is, that I think I get to little sound out of the woofer, so I would like to replace it with a better, but I don't really know what I should buy. The major problem is, that the mid and tweeters can play louder (it's actually hifi sound, I measured with oscilloscope), so they deafen the bass to much at max volume. I have a few parametres of the subwoofer, and my box is a 50 liter sealed enclosure, so maybe I could also get more output just by changing the enclose? QTS = 0,52 VAS = 25,57 FS = 36 Regards, Simon H.A.

13th July 2009, 12:14 AM	#6
tinitus diyAudio Moderator Join Date: Nov 2005	SPL is missing in your specs Take a look at the Ravemaster One problem with your car woofer could be that its made to be driven with a lot of power, and to work in a small room like a car Even if has high mms and should have low Fs, its has not due to very stiff surround, which will need lots of power And the high mms results in low SPL

13th July 2009, 12:58 AM	#7
Cyberzim diyAudio Member Join Date: Apr 2009 Location: Gentofte	It's a china sub, so can't find anymore specs. Is this the one you are talking about? Ravemaster subwoofer Regards, Simon H.A.

13th July 2009, 01:02 AM	#8
tinitus diyAudio Moderator Join Date: Nov 2005	VXT124, its the 12"

13th July 2009, 01:07 AM	#9
Cyberzim diyAudio Member Join Date: Apr 2009 Location: Gentofte	Thats looks like a pretty good one. But in what type of enclosure does it perform best? Sealed or ported? I heard that when the QTS is higher than 0,5 it is best in sealed, and when under 0,3 or something its best for ported. So what about this one? Regards, Simon H.A.

13th July 2009, 01:10 AM	#10
Cyberzim diyAudio Member Join Date: Apr 2009 Location: Gentofte	by the way, I can actually have a 15" subwoofer in my sound system cabinet, so maybe this is a choice, and with double coil I can get more power: 15" ravemaster Regards, Simon H.A.

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