All in Citation 7.4 box, AFTER bypassing its hidden internal low-pass filter.
1) LE14A, refoamed, from S99, eBay
2) LE14H, refoamed, from L222 Disco
3) LE14H, reconed, black face (H-1 cone?), also from L222 Disco
4) LE14H-1, from Citation 7.4
5) LE14H-3, new
Note: These are not near-field measurements of LF response; we're lookin' to see how they behave up to 4430 1.0 kHz crossover point. I'd say we're good to go with any of them, at least measured response-wise. New H-3's are "flattest," no?
Complete test data here:
http://audioheritage.org/vbulletin/s...5535#post55535
And here's a second new LE14H-3:
Like this, maybe:
No downward shift at 1 kHz, just a 5 dB cut from there on up. That how we're doin' this?Originally Posted by Guido
1) 1.7 uF, 0.6 mH
2) 1.0 uF, 1.0 mH
3) Full range
[Gotta go back and review how AM HP works, obviously....]
No idea what's that at the moment
I'll think about this
Capacitance and inductance should both be going up to lower the HP frequency, no?No idea what's that at the moment
I'll think about this
Why are we reducing the capacitance instead?
Giskard, can you help us with this please?
We're trying to lower the 2431H AM6212/00 HP crossover frequency from 1.1 kHz to 1 kHz so it meshes better with N3134 LP and 2235H. Not sure if that's all it will take, but it's a start....
Two and a half hours with the skill saw, jig saw, and a full sheet of plywood produces "Z1" design prototype from drawing above for LE14x and PT-F waveguides, establishing final panel dimensions, bevels (missed those on the sides of the top, obviously,) and construction methodology. Approximately 3.5 cu.ft. box will accommodate 15" drivers as well, even Sub1500, probably.
I like to kick the tires before committing, and this one's a keeper. 7° front baffle rake per L200/300 and Bob's Big Boy lunch counter (a classic Googie design element). Real deal will be made of 1-1/8" stock. PM me if you want me to cut wood for you, too. Design refinement suggestions welcome....
[Radius all the corners, maybe?]
Change the 1.7 uF to a 2.1 uF and see what happens.
I must say YOU are the king of "Quick and Dirty"... I could never do this in a few hours.... I am sure it'll tell you plenty about the prospects of the design...but then I couldn't do this either.
It took me 10 hrs to only get this far...
What, forget to bevel the top, there?
Easy. It's compound, and it was lunch time.
[Guessin' Mr. Widget don't need me to come over and help him with HIS cabinets....]
Will do. I think i have some 0.39 uF's I can add here....
It's begining to look like there is no "Quick and Dirty 4430"
Rob
Yeah.... maybe this thread should be renamed the "Meandering Quick and Dirty Two-Way Speaker Thread".
Widget
BTW: I am impressed by the get up and go you have for tackling things that are frequently considered somewhat daunting. I would have spent a day just calculating the angles for those joints.
We're gettin' close....It's begining to look like there is no "Quick and Dirty 4430"
Rob
This thread has been closed at 450 posts due to length.
Please go to Quick & Dirty 4430-Inspired Two-Ways Part II to continue with this topic.
People who make sound their business depend on JBL for their sound.
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