Which enclosure for cheap 18"?

Frode · 20th December 2010, 04:37 PM

What enclosure would you recommend for this driver: http://www.mamut.net/dynabel/pa1880-1000-web.jpg?
I'm thinking of subwoofer duty in home environment, no need for high SPL. Enclosure can be fairly large, several drivers can be used.

Frode

mashaffer · 12:16 AM

Haven't simulated it but a quick look seems to indicate horn or possibly bass reflex. Q is a little low for sealed IMO. Not a lot of xMax but with 18" it may not be needed. The question in a horn would be whether the cone structure is strong enough for the pressures. Sometimes that can be a problem with large drivers. Other than asking the manufacturer I do not know how you would discern this by yourself.

Now that I think about it the fs is probably a little low for a horn anyway (Unless you are after subsonics primarily). I would model some ported enclosures and see how it comes out. Free software like BoxPlot et.al. are very nice for this purpose.

Thawach · 21st December 2010, 04:21 AM

very big 18" in home. no need the high spl. the bass reflex is better than anything.

GM · 21st December 2010, 04:43 AM

Guess it depends on what sort of performance you're after. For instance, four with 400 W on tap in 20 ft^3 tuned to 16 Hz has enough theoretical peak SPL to either blend to some room gain and/or EQ it flat all the way down or meet THX cinema reference down to 25-30 Hz. Trade some peak SPL for more damping to further 'tighten' it up to better mate to horns.

Or you can use two drivers/400 W/20 ft^3 in a TH to get similar results to 80-100 Hz.

GM

bjorno · 21st December 2010, 03:54 PM

FYI:

b

Frode · 21st December 2010, 09:47 PM

Quote:

Originally Posted by GM

For instance, four with 400 W on tap in 20 ft^3 tuned to 16 Hz has enough theoretical peak SPL to either blend to some room gain and/or EQ it flat all the way down or meet THX cinema reference down to 25-30 Hz. Trade some peak SPL for more damping to further 'tighten' it up to better mate to horns.

GM

20 ft^3 per driver or for all 4?

Frode

GM · 21st December 2010, 09:59 PM

5 ft^3 net/each

GM

Frode · 21st December 2010, 10:03 PM

Quote:

Originally Posted by GM

5 ft^3 net/each

GM

This sounds good. I said they could be fairly large, but 4 times 20ft^3 would be stretching it! Merry Christmas to you Greg!

Frode

GM · 22nd December 2010, 01:24 AM

Ah! So it is you! The City of Bergen didn't 'ring any bells' with me.

Merry Christmas to you also! ('Sounds' strange nowadays, what with all the political correctness 'forcing' folks to use 'Happy Holidays')

Well, you know me, 20 ft^3/dual 15" is just a good starting point for getting serious, but your horns already take up a sizable percentage of living room 'real estate' if it's the same as you sent pics of several years ago.

GM

Thawach · 22nd December 2010, 08:58 AM

Quote:

Originally Posted by Frode

This sounds good. I said they could be fairly large, but 4 times 20ft^3 would be stretching it! Merry Christmas to you Greg!

Frode

post pics here if it's finish. i want to see the big speaker. after i post i forgot to saw the "fairly large" good luck to build Frode

20th December 2010, 04:37 PM	#1
Frode diyAudio Member Join Date: May 2003 Location: Bergen	Which enclosure for cheap 18"? What enclosure would you recommend for this driver: http://www.mamut.net/dynabel/pa1880-1000-web.jpg? I'm thinking of subwoofer duty in home environment, no need for high SPL. Enclosure can be fairly large, several drivers can be used. Frode

21st December 2010, 12:14 AM	#2
mashaffer diyAudio Member Join Date: Jun 2004 Location: Indiana	Haven't simulated it but a quick look seems to indicate horn or possibly bass reflex. Q is a little low for sealed IMO. Not a lot of xMax but with 18" it may not be needed. The question in a horn would be whether the cone structure is strong enough for the pressures. Sometimes that can be a problem with large drivers. Other than asking the manufacturer I do not know how you would discern this by yourself. Now that I think about it the fs is probably a little low for a horn anyway (Unless you are after subsonics primarily). I would model some ported enclosures and see how it comes out. Free software like BoxPlot et.al. are very nice for this purpose. __________________ mike - www.keepingsundayspecial.org Last edited by mashaffer; 21st December 2010 at 12:16 AM.

21st December 2010, 04:21 AM	#3
Thawach diyAudio Member Join Date: Dec 2007	very big 18" in home. no need the high spl. the bass reflex is better than anything. __________________ out of the past=out of the future=in the present time+ing

21st December 2010, 04:43 AM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Guess it depends on what sort of performance you're after. For instance, four with 400 W on tap in 20 ft^3 tuned to 16 Hz has enough theoretical peak SPL to either blend to some room gain and/or EQ it flat all the way down or meet THX cinema reference down to 25-30 Hz. Trade some peak SPL for more damping to further 'tighten' it up to better mate to horns. Or you can use two drivers/400 W/20 ft^3 in a TH to get similar results to 80-100 Hz. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

21st December 2010, 09:59 PM	#7
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	5 ft^3 net/each GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.


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22nd December 2010, 01:24 AM	#9
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Ah! So it is you! The City of Bergen didn't 'ring any bells' with me. Merry Christmas to you also! ('Sounds' strange nowadays, what with all the political correctness 'forcing' folks to use 'Happy Holidays') Well, you know me, 20 ft^3/dual 15" is just a good starting point for getting serious, but your horns already take up a sizable percentage of living room 'real estate' if it's the same as you sent pics of several years ago. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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