First time designing a sub, please check my work

mFinalHeaven · 16th August 2003, 09:02 PM

So I decided on the Peerless 831858 that is on sale at madisound. Using Winisd, I have decided to put it in a 32L box tune to 28Hz using two 1 in diameter 4in length ports.

The curve looks pretty flat and the extension and group seems good for music as far as I can tell with my limited knowledge. So how is this setup? Does it look alright? Any comment is appreciated. Thanks!

PS. This is a sub that will be eventually use with a pair of super elf or elf 1.5 as my computer sound system.

Centauri · 17th August 2003, 03:45 AM

Hi,

I don't have specs of this particular driver to model it in my copy of Lspcad, however 1" diameter ports seems a little on the small side to eliminate air speed noises. May be better to use 2" or 3" ports and make them longer to get required tuning.

Cheers

mFinalHeaven · 17th August 2003, 05:23 AM

I calculated the port diameter and length via isd online and this give a vent mach less than 0.16 which should not give me any port noise.

zx3chris · 17th August 2003, 05:37 AM

never used the winisd online version--i suggest u download the alpha pro and use that.. possibly the online version is estimating at 1w of power---did you enter in the max power you will be deliving to the sub as a parameter as well??

-chris

mFinalHeaven · 17th August 2003, 05:42 AM

I put in 100 watts as the max power. Is this correct?

mFinalHeaven · 17th August 2003, 05:47 AM

just redid it with 150watts and its still fine.

GM · 17th August 2003, 07:00 AM

Driver specs?

BTW, WINISD has errors in it, so be forewarned! Also, <5% mach vent speed (0.05) is where you need to be for best performance as long as the pipe doesn't get too long for the sub's intended BW. 16% will be audible unless some means is used to damp it, though I've had folks tell me that subs with a 20% calculated vent mach sound fine to them, so YMMV.

GM

mikee12345 · 17th August 2003, 07:02 AM

yes i must compare sub sim,dosbox,winisd old,new and any other i can find...see what teh diff is

my winisd 33hz box turned out just how winisd said-=also a mate with a good spreadsheet double checked it

mFinalHeaven · 17th August 2003, 08:28 AM

Unixbox tells me I will have problems with that port size

Guess its back to the drawing board. Thanks for pointing that out.

Centauri · 17th August 2003, 02:19 PM

OK

Found some specs on this driver. Lspcad shows for this box size & tuning minimum 2 ports 50mm dia (2") by 310mm long (12") - better would be 2 50mm ports 280mm long in a 49.8 litre box - tuning point would be 22.7Hz.

Cheers

16th August 2003, 09:02 PM	#1
mFinalHeaven diyAudio Member Join Date: Sep 2002 Location: San Diego, CA	First time designing a sub, please check my work So I decided on the Peerless 831858 that is on sale at madisound. Using Winisd, I have decided to put it in a 32L box tune to 28Hz using two 1 in diameter 4in length ports. The curve looks pretty flat and the extension and group seems good for music as far as I can tell with my limited knowledge. So how is this setup? Does it look alright? Any comment is appreciated. Thanks! PS. This is a sub that will be eventually use with a pair of super elf or elf 1.5 as my computer sound system.

17th August 2003, 07:00 AM	#7
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Driver specs? BTW, WINISD has errors in it, so be forewarned! Also, <5% mach vent speed (0.05) is where you need to be for best performance as long as the pipe doesn't get too long for the sub's intended BW. 16% will be audible unless some means is used to damp it, though I've had folks tell me that subs with a 20% calculated vent mach sound fine to them, so YMMV. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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17th August 2003, 03:45 AM	#2
Centauri diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Hi, I don't have specs of this particular driver to model it in my copy of Lspcad, however 1" diameter ports seems a little on the small side to eliminate air speed noises. May be better to use 2" or 3" ports and make them longer to get required tuning. Cheers

17th August 2003, 05:23 AM	#3
mFinalHeaven diyAudio Member Join Date: Sep 2002 Location: San Diego, CA	I calculated the port diameter and length via isd online and this give a vent mach less than 0.16 which should not give me any port noise.

17th August 2003, 05:37 AM	#4
zx3chris diyAudio Member Join Date: Oct 2002 Location: south amboy nj	never used the winisd online version--i suggest u download the alpha pro and use that.. possibly the online version is estimating at 1w of power---did you enter in the max power you will be deliving to the sub as a parameter as well?? -chris

17th August 2003, 05:42 AM	#5
mFinalHeaven diyAudio Member Join Date: Sep 2002 Location: San Diego, CA	I put in 100 watts as the max power. Is this correct?

17th August 2003, 05:47 AM	#6
mFinalHeaven diyAudio Member Join Date: Sep 2002 Location: San Diego, CA	just redid it with 150watts and its still fine.

17th August 2003, 07:02 AM	#8
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	yes i must compare sub sim,dosbox,winisd old,new and any other i can find...see what teh diff is my winisd 33hz box turned out just how winisd said-=also a mate with a good spreadsheet double checked it

17th August 2003, 08:28 AM	#9
mFinalHeaven diyAudio Member Join Date: Sep 2002 Location: San Diego, CA	Unixbox tells me I will have problems with that port size Guess its back to the drawing board. Thanks for pointing that out.

17th August 2003, 02:19 PM	#10
Centauri diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	OK Found some specs on this driver. Lspcad shows for this box size & tuning minimum 2 ports 50mm dia (2") by 310mm long (12") - better would be 2 50mm ports 280mm long in a 49.8 litre box - tuning point would be 22.7Hz. Cheers