loudest enclosure type?

MEXXX · 19th October 2004, 01:13 PM

I was having a discussion with a friend of mine about what type of enclosure would be the loudest for a single given frequency, i.e. 50hz.

I settled on some type of double tuned bandpass, he went with a simple ported alignment.

So, which enclosure type can be crowned loudest of them all? I know there are much more knowledgeable pros on this forum that could answer this without even breaking a mental sweat.

TIA,

MEXXX

audioPT · 19th October 2004, 01:18 PM

This is just my opinion and experience:

A well tuned Bass-Reflex (ported) can be more loud than a bandpass enclousure.

I have a bandpass subwoofer and a BR one. Both have the same driver and the BR is louder. The bandpass only gets lower frequencies than the BR.

Remember, this is my experience with my enclousures.

Regards

MEXXX · 19th October 2004, 01:32 PM

I agree that a well tuned BR enclosure can be louder than a bandpass when both are designed to play a fairly broad frequency range, BUT....... When I model the two enclosures to play a single frequency as loud as they can, a double-tuned series bandpass seems to come out on top.

audioPT · 19th October 2004, 02:24 PM

Yes, but... what about the other frequencies?

Are you going to play ONLY 50Hz ??

dnsey · 19th October 2004, 02:33 PM

Surely a horn's more efficient ('LOUDER') than either

MEXXX · 19th October 2004, 03:11 PM

Quote:

Yes, but... what about the other frequencies?

No other frequencies. The thought actually came up after my friend came over to show me his completely pointless competition SPL setup for his van.

SPL competitions make about as much sense as NASCAR racing

.

Puggie · 19th October 2004, 03:51 PM

Bandpass would probably be his best bet (They are big on one note wonders in Finland and they are starting to use a lot of bandpass stuff), Bass reflex is much simpler to do though and a lot more tollerant of errors. Horns would be ideal but its usually a space issue, even a folded horn to hit 50Hz is pretty damn big, try squeezing one in a car! Although you may well just get one in a van.

GM · 19th October 2004, 04:08 PM

AFAIK, a compression driven tapered pipe, i.e. a type 1 (sealed back) bandpass tuned with a tapered (to reduce the length and further load the driver) vent to 50Hz. The driver will have to be custom made to get the near 50% efficiency it's capable of and the power handling required to reach the SPL required to 'blow the doors off'

the competition.

If you must use a readily available point source driver, then find the lowest Fs, Qes, and highest Pe, Xmech driver available for its frame size. To gain acoustic efficiency, use a driver size that yields the highest compression ratio that doesn't 'lay down' from thermal power compression, rip something, or burn up in the time frame of the 'run'.

IOW it's only good for as many 'runs' as required by the rules, so at a glance an 18" HE driver with a high Mms and super strong motor to keep Qes low is the 'Hot Ticket'. Remember, the highest efficiency racing motor for a given set of rules/conditions blows as it crosses the finish line so design it for easy driver replacement between 'runs', yet still seals completely as any leaks will 'kill' most of its efficiency.

GM

phase_accurate · 19th October 2004, 04:37 PM

If it doesn't matter when the thingie has a bipolar characteristic then a quarter-wave pipe on the front AND back might do the trick.
I once wanted to try this out as a neigbour-annoying device.

Regards

Charles

MEXXX · 19th October 2004, 04:46 PM

GM, did you just describe the Adire Maelstrom?

I sure hope not, because I already own one and curiosity might kill that cat by the weeks end

.

Also, how would one go about modeling a compression driven tapered pipe? Is there a worksheet for such a design?

19th October 2004, 01:13 PM	#1
MEXXX diyAudio Member Join Date: Oct 2004	loudest enclosure type? I was having a discussion with a friend of mine about what type of enclosure would be the loudest for a single given frequency, i.e. 50hz. I settled on some type of double tuned bandpass, he went with a simple ported alignment. So, which enclosure type can be crowned loudest of them all? I know there are much more knowledgeable pros on this forum that could answer this without even breaking a mental sweat. TIA, MEXXX

19th October 2004, 04:08 PM	#8
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	AFAIK, a compression driven tapered pipe, i.e. a type 1 (sealed back) bandpass tuned with a tapered (to reduce the length and further load the driver) vent to 50Hz. The driver will have to be custom made to get the near 50% efficiency it's capable of and the power handling required to reach the SPL required to 'blow the doors off' the competition. If you must use a readily available point source driver, then find the lowest Fs, Qes, and highest Pe, Xmech driver available for its frame size. To gain acoustic efficiency, use a driver size that yields the highest compression ratio that doesn't 'lay down' from thermal power compression, rip something, or burn up in the time frame of the 'run'. IOW it's only good for as many 'runs' as required by the rules, so at a glance an 18" HE driver with a high Mms and super strong motor to keep Qes low is the 'Hot Ticket'. Remember, the highest efficiency racing motor for a given set of rules/conditions blows as it crosses the finish line so design it for easy driver replacement between 'runs', yet still seals completely as any leaks will 'kill' most of its efficiency. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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19th October 2004, 01:18 PM	#2
audioPT diyAudio Member Join Date: Aug 2002 Location: Right here	This is just my opinion and experience: A well tuned Bass-Reflex (ported) can be more loud than a bandpass enclousure. I have a bandpass subwoofer and a BR one. Both have the same driver and the BR is louder. The bandpass only gets lower frequencies than the BR. Remember, this is my experience with my enclousures. Regards

19th October 2004, 01:32 PM	#3
MEXXX diyAudio Member Join Date: Oct 2004	I agree that a well tuned BR enclosure can be louder than a bandpass when both are designed to play a fairly broad frequency range, BUT....... When I model the two enclosures to play a single frequency as loud as they can, a double-tuned series bandpass seems to come out on top.

19th October 2004, 02:24 PM	#4
audioPT diyAudio Member Join Date: Aug 2002 Location: Right here	Yes, but... what about the other frequencies? Are you going to play ONLY 50Hz ??

19th October 2004, 02:33 PM	#5
dnsey diyAudio Member Join Date: Mar 2004 Location: Shropshire, England	Surely a horn's more efficient ('LOUDER') than either

19th October 2004, 03:51 PM	#7
Puggie diyAudio Member Join Date: Oct 2004	Bandpass would probably be his best bet (They are big on one note wonders in Finland and they are starting to use a lot of bandpass stuff), Bass reflex is much simpler to do though and a lot more tollerant of errors. Horns would be ideal but its usually a space issue, even a folded horn to hit 50Hz is pretty damn big, try squeezing one in a car! Although you may well just get one in a van.

19th October 2004, 04:37 PM	#9
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	If it doesn't matter when the thingie has a bipolar characteristic then a quarter-wave pipe on the front AND back might do the trick. I once wanted to try this out as a neigbour-annoying device. Regards Charles

19th October 2004, 04:46 PM	#10
MEXXX diyAudio Member Join Date: Oct 2004	GM, did you just describe the Adire Maelstrom? I sure hope not, because I already own one and curiosity might kill that cat by the weeks end . Also, how would one go about modeling a compression driven tapered pipe? Is there a worksheet for such a design?

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