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Old 8th September 2007, 09:30 PM   #1
fusion is offline fusion  United Kingdom
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Default heeeeelp mee!! (enclosure design)

I've been all around the internet reading about enclosure design, but for this one small project I just cant get my head around it.

I have just purchased a Sony XS-L154P5B 15" Woofer. Ok, you might not like it and it wouldnt be my cars first choice, but I got it pretty cheapish.

Anyways, I have some woodworking experience but just cant design effective enclosures to save my life.

The specs are -

* Speaker Size (cm): 38
* Speaker Size (inch): 15
* Peak Power (W): 1500
* Rated Power (RMS, W): 450
* Impedance (ohms): 4
* Sensitivity (dB/W/m): 89
* Frequency Response (Hz): 15 - 2000
* Mass (kg): 6
* Mass (lb/oz): 13/11
* d (mm): 320
* d (inch): 12.6
* Rdc (ohms): 3.3
* Fs (Hz): 20.2
* Qts: 0.46
* Qes: 0.49
* Qms: 7.25
* Vas (Lit.): 175.2
* Vas (Cu. ft.): 6.19
* Mms (g): 325.2
* Lvc (mH): 1.1
* Xmax (mm): 5.7
* Xmax (inch): 0.2
* BL (Tm): 16.1
* Sealed Enclosure Vol. (Net Cu. ft.): 2.18
* Sealed Enclosure Vol. (Net Lit.): 62


I am just posting to ask if anyone could help me out and design me a box for my car boot (mk1 facelift renault clio so hatchback) and I would build it next sunday. If anything im happy to slip a person a fiver via paypal. Just need something that really performs.

Thanks for ANY help people,
Richard.
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Old 8th September 2007, 09:49 PM   #2
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Angry Re: heeeeelp mee!! (enclosure design)

Quote:
Originally posted by fusion

* Sealed Enclosure Vol. (Net Lit.): 62

Hi Richard,
A sealed box, 62 litres. You've answered your own question.
That's 25 cm x 50 cm x 50 cm or any combination that equals 62000.
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Old 8th September 2007, 09:56 PM   #3
fusion is offline fusion  United Kingdom
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wuda liked other reccomendations. are you sure I should go for a sealed. reckon a bandpass could fit? ported?

thanks for the reply, much appreciated. any more?
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Old 8th September 2007, 10:04 PM   #4
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Default Re: heeeeelp mee!! (enclosure design)

Quote:
Originally posted by fusion

* Qts: 0.46

The Qts says best results from a sealed box.

Bandpass is not an alignment I'd ever use.
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Old 9th September 2007, 01:31 AM   #5
GM is offline GM  United States
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Quote:
Originally posted by fusion
wuda liked other reccomendations. are you sure I should go for a sealed. reckon a bandpass could fit? ported?

thanks for the reply, much appreciated. any more?
Greets!

Well, a T/S max flat vented alignment (lowest half space F3) requires ~270 L net/~17 Hz F3, but I'm thinking this is probably too large for a Renault unless it's a stripped out mini-van and a smaller prosound vented alignment is ~100.1 L net/~26 Hz F3, but the vent is so long that it will increase box size considerably once folded up inside, so maybe too big too, making sealed starting to look really good with the same 100.1 L for a 0.707 Qtc (T/S max flat)/~33.4 Hz F3 and the recommended 62 L clocking in at a mildly under-damped 0.826 Qtc/~34.7 Hz F3.

For something a bit different, an end loaded max flat impedance TL should perform well if the size isn't too big with an unfolded 182 cm length and 695.81 cm^2 cross sectional area (CSA) for a ~128.7567 L net stuffed to suit.

BP meets the needs of some apps with the right driver, but this one in 148 L net 4th order tuned to 37 Hz looks to be a 'one note' boombox, so not one I'd recommend.

As always though, YMMV.

GM
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