fro this time i am thinking that only in Japan can make minis
but now i have change my opinion
fro this time i am thinking that only in Japan can make minis
but now i have change my opinion
Testing 2nd generation biamp-able crossover with LE8T-H.
Solen caps, no bypass.
~12 dB fixed attenuation is required for 2404H-1.
It'll go into closed-box Mini-4425.
[I need a Mini-B380 to go with....]
Not to go too far OT, but wrt Zilch's shot of the LE8T-H:
Zilch: I constructed a similar two-way with the LE20. It was interesting, but not sonically compelling. Anyway, those LE8T-H's look like the NOS that occaisionally appears on eBay - I had many. Check the surround join to the cone-edge - it seems with age (in the box) the surround was decrepitating and/or poorly glued, and separates easily from the cone-edge. Every single one I had needed to be resurround (since the spiders were unused they seemed in factory condition).
bo
"Indeed, not!!"
Hey Zilch if your are going to build a mini B380/go with a sorta half size 480 and use a 2214 as the 2245 substitute.
Rob
I am amazed that these excellent projects came out of a photo in someone's office and a Japanese catalog of mini speakers for mini houses.
All we need now is a L250Ti mini project to top it off.
Exactly, but these were purchased direct during the final production, "B" stock. One of the tinsels needs a bit more Moyen, but other than that, they're fine.Originally Posted by boputnam
I've also tried an older pair of Alnico LE8T's with new surrounds, but find either, as you say, usable, but unexciting. CLIO has found some anomalies right smack in the 3 kHz crossover region, as well.
So, now I'm working with an old pair of 116A with new surrounds, which are doing nicely. Like 115A, they have a nasty peak, these at ~3480 Hz, but I've succeeded in notching that out (below). The performance is quite good, now, enough so to probably warrant hunting down some 116H-3's for more power handling and perhaps no peak to correct.
Other suggestions for 8" drivers welcome.
The 2404H-1's I'm using are of indeterminate provenance, and not performing as well as Johnaec's as measured by Widget. I have some new 2405 diaphragms to go in another pair of motors, which are on the way, so I'll soon be able to compare.
I don't believe JBL ever mated 2404H with a small woofer in a production two-way monitor, but it seems to work. There's a huge cost disparity, of course, in comparison to 035TiA and other dome tweeters they typically use, for example, but that's where DIY has an advantage; we don't have to give a whit about marketability....
Hmmm ... a Mini-B460. Now THERE's a project worthy of full-on pursuit!
How about the 4612 components with a 2118H
That one's easy - find another, of course....Gotta love collaboration.
Lessee: 8.75"/12.5" = 0.70
0.70 x 15" = 10.5"
So, pairs of anybody's favorite 10" or 12" woofers would make Midi-4435's using 2342 horns that'd potentially sound better'n merely good....
Johnaec did the cabs,
I did the crossovers,
and JBL did the drivers.
[Still gotta find some more knobs....
Heh.
Those are great Zilch. I like the proportions of a little larger woofer.
What is the woofer, and are they sealed or is there a port in the back?
Hi, John,
They're 116A's, and the boxes are sealed.
(Prototype response curve above.)
Still looking for other 8" options to try.
As jbl4ever suggests, 2118H would work, but they'd almost certainly require a sub.
I can add a rear port at any time for others, if required....
[Should I put mini-spikes on 'em?
O.K., where's the pic of the transparent red L250's from down under?
That's how I wanna finish these....
All right, I ain't tellin' how they sound then.
[Real 2404H's (not H-1's) running in them now....
1) Parts Express #091-1247 input terminals are staked through 3/8" thick hardboard then mounted from inside on the rear baffle. Recessed 3/4", they end up flush.
2) Crossover board then mounts on 1/2" standoffs with input terminals running through (upper right) making a direct connection.
3) A layer of R-13 on top adds up to ~50% fill. Still determining what's optimum damping for these.
4) Nearfield low frequency response, L & R. I don't know what's happening at 2 kHz there; not part of the design, for sure. It doesn't appear in the midfield response, next.
5) Full system response, both sides playing, mic at acoustic center ~2 M from each. I play the orange HF response mostly.
Note smoother and more extend VHF response of 2405 diaphragms in comparison to "H-1" with 2402 in post #81, above.
So, is it possible to make "listenable" minis?
Absolutamundo....
'Looks good, Zlch! (I see you found some knobs.
John
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