where does one go for help with 1/4 wave design ? - diyAudio
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Old 30th July 2006, 05:27 AM   #1
zuki is offline zuki  United States
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Default where does one go for help with 1/4 wave design ?

i don't know how to figure out the size box , but can easily build a box if have the dimensions

i built the ace box for the lowther driver

i recently found a car audio woofer and wondered if,could be used in a 1/4 wave application


http://cgi.ebay.com/ws/eBayISAPI.dll...MEWN:IT&ih=016


thank you

if someone would like to post a picture for me.

i can send them a latest picture of my fullrange speaker system to post on this forum
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Old 30th July 2006, 05:43 AM   #2
Dumbass is offline Dumbass  British Antarctic Territory
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You can design an alpha-TL (cylindrical enclosure, one end open, one end closed) on a back-of-napkin basis if you have the article (dammit, I can't find the URL) and some basic T-S specs, and be fairly assured of good performance. And AFAIK such an enclosure isn't terribly sensitive to deviations from specs.

Once you start porting ("mass-loading") a TL, you can really screw it up unless you carefully model the enclosure using Martin's software (or other software of which I'm not aware). A well-designed enclosure of this type, however, will be able to reach lower.
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Old 30th July 2006, 08:05 AM   #3
zuki is offline zuki  United States
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i would like the speaker to have as much/go as low end as possible.
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Old 30th July 2006, 08:28 AM   #4
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Problem is, without any accurate T/S parameters, we're shooting in the dark here. If you can get hold of those, we're in business.
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Old 30th July 2006, 06:26 PM   #5
Dumbass is offline Dumbass  British Antarctic Territory
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Quote:
Originally posted by zuki
i would like the speaker to have as much/go as low end as possible.
Don't we all?
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Old 30th July 2006, 06:42 PM   #6
XT8510 is offline XT8510  Netherlands
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see if you can find the T&S parameters of the Macrom I2.40 those are the exact same speakers. The TS for the Macroms were online at several European websites a few years ago.

I'll have a look if I can find them in the mean time.

My advice knowing these speakers do not waste time trying to get too much bass out of these. They work much better doing the mids and highs augmented with a bass unit or subwoofer
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Old 1st August 2006, 12:54 AM   #7
zuki is offline zuki  United States
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what size type enclosure would someone suggest ?

thank you


http://www.macrom.it/IMG/pdf/Manual-i240-5410.pdf
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Old 1st August 2006, 01:09 AM   #8
zuki is offline zuki  United States
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Specifications
The wide smooth frequency response, good sensitivity and high power handling make the
I 2.40 suitable for use in any quality installation
Power Handling: 80 Watts satellite (max. music)
50 Watts full range (max. music)
Nominal Impedance: 4 Ohm
Frequency Response: 80-25.000 Hz
Sensitivity (2.83V/1m): 89 dB
Unit Size -100 mm (4)
Voice coil
Woofer - 54 mm (2 1/4)
Tweeter - 28 mm (1 1/8)
Resonant Frequency: 125 Hz
Dc Resistance: 3.40 Ohm
Voice Coil Inductance @ 1Khz 0.22 mH
Air Gap Height: 4 mm
X-Max Linear Excursion: 2 mm
Force Factor (BXL) 2.79 tm
Qms: 4.98
Qes: 1.26
Q/Ts: 1.00
VAS: 1.21 lt
Cms: 443 M/N
Moving Mass (ms): 3.66 gr
Magnet System: Triple magnet
Cone Material: DPC
Dome Material: Soft Fabric
Nett Weight (per piece): 0.5 Kg
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Old 1st August 2006, 11:42 PM   #9
Dumbass is offline Dumbass  British Antarctic Territory
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Happened to run across the alpha-TL article, here is a link:
http://homepage.mac.com/tlinespeaker...TL-article.pdf
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Old 3rd August 2006, 03:31 PM   #10
zuki is offline zuki  United States
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thank you
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