New sub design? Constricted Transflex, simple build (series tuned 6th order) - Page 2 - diyAudio
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Old 23rd July 2014, 07:56 AM   #11
freddi is offline freddi  United States
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oops - is the SWE-10S4 discontinued? - don't see it at Sonic Electronics and no new ones currently (?) at Ebay
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Old 23rd July 2014, 08:22 AM   #12
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Freddi,
this place still carries them:
Alpine SWE-10S4 10" 750W 4-Ohm Type-E Series Car Audio Subwoofer at Onlinecarstereo.com
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Old 23rd July 2014, 08:29 AM   #13
freddi is offline freddi  United States
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mixed reviews on that seller Online Car Stereo - Vernon - Vernon, CA | Yelp
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Old 23rd July 2014, 08:56 AM   #14
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Egad ! Those reviews are terrible ..... Reading those would make anyone reluctant ...

I had purchased a Pioneer car stereo deck from them about 6 months ago .... It went smoothly .... Nothing nightmarish like what these people are reporting ...
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Old 23rd July 2014, 09:02 AM   #15
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These guys say they have the 10S4s in stock , but i would call to be sure
Alpine Type-E Subwoofer SWE-10S4*| Creative Car Audio
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Old 23rd July 2014, 09:03 AM   #16
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and another , price isnt as good as the above link though
Alpine SWE-10S4 10" Type E Series Black Subwoofer SWE10S4
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Old 23rd July 2014, 09:11 AM   #17
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and another ... but since the supply of these seems to be drying up i might try to seek out some more alternative drivers ..

Alpine SWE-10S4 10" 750W 4 Ohm Type E Series Car Audio Subwoofer
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Old 23rd July 2014, 09:24 AM   #18
freddi is offline freddi  United States
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thanks for the Alpine hunt - would it work well with a Polk DB1040 SVC?
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Old 23rd July 2014, 09:44 AM   #19
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Almost, if the FS was a little higher on that one, and the VAS a bit lower ... I just had a look at the parameters listed on the Polk website ...

There is an affordable Pioneer that looks like a marginal candidate , and an Orion that can work ..... So far nothing has quite nailed the specs like the 10S4 does though, i will keep looking ...
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Old 24th July 2014, 10:15 AM   #20
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I tinkered around with HR a little more to try to approximate the proper shape of the first section and of course it puts the driver too close to the constriction , so even though there really isnt any way that i know of to fully sim this box in Hornresponse i do see that lo-and-behold this shape does shift the FB up by a few hertz ... So good call .. I didn't notice that before ..
I did however come up with a variation that we can fully simulate using the throat chamber function .... Looks like it only loses a db or so, and is still as simple as the other design while still maintaining similar outer dimensions (or even a little smaller) .... It is a little more flexible too and could possibly accommodate a wider variety of drivers since changing the shape and length of "Lpt" and "Ap1" seems to have significant effects upon the response curve..
Extension seems slightly better and the low compression ratio (almost 1:1) should reduce the likelihood of physical damage with the drivers such as cone failure ..

Tell me what you think of this ..
Attached Images
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File Type: jpg ConstrictedTransflexV2-ROUGH-SKETCH.JPG (18.4 KB, 1065 views)
File Type: jpg ConstrictedTransflexV2.JPG (61.7 KB, 1043 views)

Last edited by Matthew Morgan J; 24th July 2014 at 10:36 AM.
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