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Old 18th December 2004, 06:20 AM   #1
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Default "Different" Jensen woofers.

Hey guys,

A couple years back I bought some strange Jensen 10" woofers,just because they were "different" and were cheap.

I think they are Jensen "3P" 10" woofers.
They are different because they use a flat (coated?) styrofoam cone (Piston),they almost look like a passive radiator,but have a fairly large magnet structure(and,of course,voice coil) on the back.They are only maybe ~4 inches deep.

I forget exactly what they say on the rear (they aren't here at the moment.)..
"3P"
" Poly Piston ___ "
something along those lines.

Has anyone ever seen these? Perhaps someone has some info on them? Any ideas for a tweeter to match,x-over points,etc?
They should make an interesting project.
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Old 19th December 2004, 03:55 PM   #2
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*bump*

Pictures? T/S params? I'm really curious.
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Old 16th November 2006, 02:28 PM   #3
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After a long time,I ran across these speakers again in my junk pile..

Here's some Pic's.

http://www.phatbong1.50megs.com/cgi-...f/PICT0019.JPG
http://www.phatbong1.50megs.com/cgi-...f/PICT0020.JPG
http://www.phatbong1.50megs.com/cgi-...f/PICT0021.JPG
http://www.phatbong1.50megs.com/cgi-...f/PICT0022.JPG
http://www.phatbong1.50megs.com/cgi-...f/PICT0023.JPG


Anyone ever seen these before?
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Old 24th November 2006, 01:17 PM   #4
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*bump*

Anyone?
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Old 4th November 2008, 04:14 AM   #5
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Default Digging up an olllddd thread

So,I finally found my papers with some test measurements on these speakers.

From Speaker Workshop:
Fs: 34.767Hz
Vas 2.129 CuFt
Qts: 0.585
Qms: 3.411
Qes: 0.707
Le: 1.541 mH
L1: 0.239 mH
Re (DCR) 5.561 ohms
Xmax: 0.394 in
Bl: 0.100

Sealed box volume 1.060 Cu Ft
Added Mass 0.035 Oz

I also have Impedance/Phase plots that I will try to scan.

Ohh,and the pics are now also on my photobucket site


Some interesting looking speakers,in any case. Still not sure what to do with them. Any thoughts?
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Old 6th November 2008, 01:00 PM   #6
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*bump*

Any ideas?

What sort of enclosure might the spec's suggest?
(my first thought was that they may make interesting OB's,I dunno.)
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Old 6th November 2008, 01:10 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

Sealed box or much larger but goes deeper TL or MLTL.

Must be used in a 3-way I would say, likely very dodgy midrange.

/sreten.
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