Cabinet for JBL K-Series (....or D-Series)
Hey,
Im the prowd owner of a pair JBL K-120 and K-140.
Im very keen to build these ones some nice enclosures, but I have no clue of the recommended volume these drivers should get.
They are supposed to run at home, so no big PA-abuse....
And as well Im very unshure bout the type of enclosure; Sealed, Vented or even a Horn!?
What does work the best in bout ~20mē at home?
Thanks a lot for your help, I really do aprecciate it!!
Best wishes from Germany,
Olaf
Ps.
A different question; whats the difference between the "K" and the "D" Series?
1 Attachment(s)
T&S parameters K & E series
I can't find the active link so here is pdf :)
K120 is a guitar speaker.
I know they sounded better than whatever the original speakers were.
Since I stopped playing bass in bands 40 years ago I have used my D140F for bass Hi Fi speakers. JBL doesn't list FS for the D140F, but the K140 has a FS of 30Hz. A box of 4~6 cubic ft. would be a good place to start.
There are many books and PC programs the will give you dimensions and port size if put the Thiele-Small info. John
Good Candidate for a FrankenWoofer
- Acccording to JBLs' published TS specs, a resourceful reconer could turn a "healthy" K140 into quite a respectable hifi woofer ( the woofer must have the K140 kit in it, as well as still being in spec. at Fs [ or close to the original 30 hz figure ] ) . The net result would be a woofer that's a blend of the 2231a and the TAD 1601 . ( FWIW, exclude the shorter coiled E140 from this discussion . )
- The process involves replacing the aluminum dust cap with a paper type, as well as mass loading the cone ( @ 20 to 30 grams ) . Since I like the damping effects of aquaplas , I'd likely start with a 50 / 50 division ( of added cone weight ) resulting from an aquaplas coating and the use of a home built mass ring ( non- ferric type, riding on top of the voice coil ) .
- Obviously this sort of custom work needs to be done by a professional reconer who is also able to measure the resulting shift in TS parameters ( ie ; this is not something that the casual DIYer will want to attempt ) .
<> cheers