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Old 24th August 2008, 04:27 PM   #21
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Join Date: Aug 2008
Default Re: Dude

Quote:
Originally posted by mikee55
don't buy one. This site could help you. You could learn quite easily to measure your drivers Thiele/Small parameters, usually a PC with a sound card and a Digital Multimeter capable of ac milliamps. See here
http://www.readresearch.co.uk/html/utilities.htm or here
http://sound.westhost.com/tsp.htm

Throw that box back in ya van, so you got some toones, whilst you design your box.

Re measure your van and look again at what room you can afford to use.

Post or search for a better ratio of height width depth of your box, and try to design for it.
Search for cabinet construction techniques, this sub would be an effort to be proud of, I've built loads of boxes that I thought sounded right, I followed info and had help from the man himself, richie00boy, and with a driver I had gotten used to, but had no spec. I measured the T/S parameters and made a box. I was surprised at how good it sounded once correctly done. The feel good factor outweighs any purchased pre made box, especially if its not built to the right driver.
A double skin of 18mm mdf and 18mm ply would make a stiff box a Router would flush mount your drivers and finish off edges by rounding them over.

A 1000w r.m.s of juice would be better served up to you, no?

Mike

Well, I would rather build one don't get me wrong. Those sites are just uber confusing for me. Like where do I start, and how do I know what I'm doing?
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Old 24th August 2008, 07:23 PM   #22
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I don't see an edit button anywhere, so sorry for the double post.

I want to build a ported box, and you gave me a site Mikee55. I'm confused, so I'm going to list everything I know about my subs (individually) and maybe you can help if you feel inclined.

Parameters
Fo (Hz) - 31.09
QMS - 4.25
QES - 0.38
QTS - 0.35
VAS (Litres) - 69.31
REVC (Ohms) Parallel - 1.6
SPL @ 1 watt/1 meter (dB) - 89.25
X-max Linear peak-peak (mm) 24
LEVC at 1k Hz (mH) 1.14
Ported
Vented (Cubic Feet) - 2.0
Vented to (Hz) - 41
3dB down point (-3dB Hz) - 37
Port Diameter (") - 4
Port Length (") - 15.5
Number of Ports - 2
Square Port Info
Port Area (Sq./in.) - 25
Port Length (") - 15.5

That's all I know, so any information on building a ported box (with square ports) would be wonderful!

Thanx.
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Old 24th August 2008, 08:48 PM   #23
mikee55 is offline mikee55  United Kingdom
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Location: West Howe
Default Hi ninjatanzen

Straight away I'd go to the Subwoofer section of the Loudspeakers forum. richie00boy and others are there. They'd teach you how to calculate a box.

http://www.diyaudio.com/forums/forum...?s=&forumid=63

reaudio have a calculator

http://www.reaudio.com/speaker_box/LPort_Box_Calc.html

I've used it, and built 2 boxes, who knows how accurate they are, but I never heard a 10" play so loud.

http://www.linearteam.dk/

This site will give the famous Winlsd software, its free and accurate. They have a Forum too, which helps.

Mike
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