Serious subwoofer project!

Mantronic · 19th December 2003, 12:31 AM

I want to build a subwoofer to match my pair of mission m73 and my Harman.
I will use the 250watt amplifier from partsexpress.com that you already should know! Here alink anyway.
I want to know if that amplifier is any good! It seem a good one and even better for the price!
I would use as driver, a alpine Type R 12". It's a car audio driver reputed for it's good sound quality. Do you think that this driver could do somehting good?
It's a driver that is a bit better in ported enclosure but I will do my box scealed and not ported, after all the most important for me is the Sound Quality and not the power...

The box will be a special one. It will have a net volume of 1 cubic feet.
The amplifier section will be in a other completly scealed section so that the woofer section will be perfectly scealed. Also I will use 1" MDF and it will be a front fireing sub. This box will be extrememently solid and I will use heavy brace. I will weight around 50-55lb.
I will also place it on spike! But not 4! I will use 3 of them to be sure that the contact will be perfect. I will put the box on a large and thick granite plate. If the box is too light I will also add a steel plate inside!

Here my questions:
Will 50lb for a 12" 300watt sub on spike will be allright?
Is the Type R could be a good sub for home?
Sceled box in home is allright? Even if all home woofer I know are ported?
Any other comentary of recomendations?

Here a Alpine type R link:
http://iweb.alpine-usa.com:7777/pls/...=150&p_main=10

seangoesbonk · 19th December 2003, 02:39 AM

That driver isn't too cheap... $349can.

Since you're in Canada, you should check out the Adire drivers at www.creativesound.ca (Shiva, Tempest, Maelstrom)
Some of them have $1 shipping to anywhere in Canada.

Also, as an alternative to the PE amp, you could check out the Adire AVA250 ($1 shipping as well). I've heard that shipping from PE to Canada isn't too cheap...

Anyways, to be fair, I have never heard the Alpine, but I would spend $50can more and go for the 18" Maelstrom!

sam9 · 19th December 2003, 02:40 AM

Probably a good plan. I "built" the Titanic II "kit" a year or so back and have been nothing but pleased. The only thing I continue to ponder is what would a passive version with an external amp be like. I've noticed the typical plate amps appear to have fairly mediocre THD+N figures. I've wondered what the result would be if a high power version of a D.Self "Blameless Amp" were used or a high power version of the ESP P3A. Maybe is doesn't make any difference ot low frequencies, but I'd like to hear for myself someday.

Mantronic · 19th December 2003, 02:48 AM

Quote:

Originally posted by seangoesbonk
That driver isn't too cheap... $349can.

Since you're in Canada, you should check out the Adire drivers at www.creativesound.ca (Shiva, Tempest, Maelstrom)
Some of them have $1 shipping to anywhere in Canada.

Also, as an alternative to the PE amp, you could check out the Adire AVA250 ($1 shipping as well). I've heard that shipping from PE to Canada isn't too cheap...

Anyways, to be fair, I have never heard the Alpine, but I would spend $50can more and go for the 18" Maelstrom!

Don't worrie! lol this sub will cost me 220$ can. ! Nice deal!
I seen that my post suck! ...lol

Anyway I will use that amp and I will build a nice ported box, now I trying to do some meserement...
I will post soom some mesurmeent, box size and subwoofer Thiele small parameter...

grampi · 19th December 2003, 03:34 AM

What made you decide to go with a ported box instead of sealed? Generally speaking, sealed boxes sound better.

michael · 19th December 2003, 06:04 AM

the biggest reason for going ported over sealed is the massively increased deep bass that ported enclosures give, for something like HT which is what most subs are used for the sound quality is not noticed, only in refined tight music can a difference be seen, betwwen 2 subs with equal power and drivers.

Stephen D · 19th December 2003, 07:05 AM

I don't believe sealed boxes necessarily sound better. I think that rap got started because so many people have built poorly aligned ported boxes with speakers not suited for the task (Stay away from Boom Box alignments) (Generally prefer speakers with Qt below .4) (make sure the port tuning is no more than 1/2 octave above the lowest note you want to allow, & filter below that) . A ported box with a low Qt speaker that can be aligned to go down as deep as your desire dictates with low passband ripple will outperform an equivalent sealed enclosure in my book (get low louder, with less distortion) aka., sound better. It's a beautiful thing the way a port gradually kicks in adding the extra air volume needed at the low end to bring up the Max SPL on par with the upper band of the sub. It all starts with the speaker though. T/S parameters
are more critical for ported.

grampi · 19th December 2003, 01:46 PM

While ported boxes can have slightly better SQ at a certain freq, sealed boxes have a flatter freq response over the entire sub's freq range making it more suitable to handle both tasks of HT and music.

SkinnyBoy · 19th December 2003, 02:03 PM

Quote:

Originally posted by grampi
While ported boxes can have slightly better SQ at a certain freq, sealed boxes have a flatter freq response over the entire sub's freq range making it more suitable to handle both tasks of HT and music.

umm... BULL!!!

do ported... and don't use a crappy Alpine sub....

grampi · 19th December 2003, 04:18 PM

Quote:

Originally posted by SkinnyBoy

umm... BULL!!!

do ported... and don't use a crappy Alpine sub....

Bull right back at you! Go sealed and you won't be diappointed.

19th December 2003, 12:31 AM	#1
Mantronic diyAudio Member Join Date: Jul 2003 Location: quebec	Serious subwoofer project! I want to build a subwoofer to match my pair of mission m73 and my Harman. I will use the 250watt amplifier from partsexpress.com that you already should know! Here alink anyway. I want to know if that amplifier is any good! It seem a good one and even better for the price! I would use as driver, a alpine Type R 12". It's a car audio driver reputed for it's good sound quality. Do you think that this driver could do somehting good? It's a driver that is a bit better in ported enclosure but I will do my box scealed and not ported, after all the most important for me is the Sound Quality and not the power... The box will be a special one. It will have a net volume of 1 cubic feet. The amplifier section will be in a other completly scealed section so that the woofer section will be perfectly scealed. Also I will use 1" MDF and it will be a front fireing sub. This box will be extrememently solid and I will use heavy brace. I will weight around 50-55lb. I will also place it on spike! But not 4! I will use 3 of them to be sure that the contact will be perfect. I will put the box on a large and thick granite plate. If the box is too light I will also add a steel plate inside! Here my questions: Will 50lb for a 12" 300watt sub on spike will be allright? Is the Type R could be a good sub for home? Sceled box in home is allright? Even if all home woofer I know are ported? Any other comentary of recomendations? Here a Alpine type R link: http://iweb.alpine-usa.com:7777/pls/...=150&p_main=10

19th December 2003, 02:39 AM	#2
seangoesbonk diyAudio Member Join Date: Jan 2002 Location: Vancouver, BC, Canada	That driver isn't too cheap... $349can. Since you're in Canada, you should check out the Adire drivers at www.creativesound.ca (Shiva, Tempest, Maelstrom) Some of them have $1 shipping to anywhere in Canada. Also, as an alternative to the PE amp, you could check out the Adire AVA250 ($1 shipping as well). I've heard that shipping from PE to Canada isn't too cheap... Anyways, to be fair, I have never heard the Alpine, but I would spend $50can more and go for the 18" Maelstrom! __________________ My girlfriend's sub is bigger than mine...

19th December 2003, 07:05 AM	#7
Stephen D diyAudio Member Join Date: Dec 2003 Location: In a house	I don't believe sealed boxes necessarily sound better. I think that rap got started because so many people have built poorly aligned ported boxes with speakers not suited for the task (Stay away from Boom Box alignments) (Generally prefer speakers with Qt below .4) (make sure the port tuning is no more than 1/2 octave above the lowest note you want to allow, & filter below that) . A ported box with a low Qt speaker that can be aligned to go down as deep as your desire dictates with low passband ripple will outperform an equivalent sealed enclosure in my book (get low louder, with less distortion) aka., sound better. It's a beautiful thing the way a port gradually kicks in adding the extra air volume needed at the low end to bring up the Max SPL on par with the upper band of the sub. It all starts with the speaker though. T/S parameters are more critical for ported. __________________ You thought I had it!?... I thought you had it!

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19th December 2003, 02:40 AM	#3
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Probably a good plan. I "built" the Titanic II "kit" a year or so back and have been nothing but pleased. The only thing I continue to ponder is what would a passive version with an external amp be like. I've noticed the typical plate amps appear to have fairly mediocre THD+N figures. I've wondered what the result would be if a high power version of a D.Self "Blameless Amp" were used or a high power version of the ESP P3A. Maybe is doesn't make any difference ot low frequencies, but I'd like to hear for myself someday.

19th December 2003, 03:34 AM	#5
grampi diyAudio Member Join Date: Nov 2003 Location: Cheyenne	What made you decide to go with a ported box instead of sealed? Generally speaking, sealed boxes sound better.

19th December 2003, 06:04 AM	#6
michael diyAudio Member Join Date: Sep 2003 Location: Adelaide Hills	the biggest reason for going ported over sealed is the massively increased deep bass that ported enclosures give, for something like HT which is what most subs are used for the sound quality is not noticed, only in refined tight music can a difference be seen, betwwen 2 subs with equal power and drivers.

19th December 2003, 01:46 PM	#8
grampi diyAudio Member Join Date: Nov 2003 Location: Cheyenne	While ported boxes can have slightly better SQ at a certain freq, sealed boxes have a flatter freq response over the entire sub's freq range making it more suitable to handle both tasks of HT and music.

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