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Old 16th August 2003, 09:02 PM   #1
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Default 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.
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Old 17th August 2003, 03:45 AM   #2
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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
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Old 17th August 2003, 05:23 AM   #3
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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.
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Old 17th August 2003, 05:37 AM   #4
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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
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Old 17th August 2003, 05:42 AM   #5
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I put in 100 watts as the max power. Is this correct?
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Old 17th August 2003, 05:47 AM   #6
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just redid it with 150watts and its still fine.
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Old 17th August 2003, 07:00 AM   #7
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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.

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Old 17th August 2003, 07:02 AM   #8
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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
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Old 17th August 2003, 08:28 AM   #9
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Unixbox tells me I will have problems with that port size Guess its back to the drawing board. Thanks for pointing that out.
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Old 17th August 2003, 02:19 PM   #10
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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
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