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All in Citation 7.4 box, AFTER bypassing its hidden internal low-pass filter. :banghead:
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?Quote:
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 :banghead:Quote:
Originally Posted by Zilch
I'll think about this :hmm:
Capacitance and inductance should both be going up to lower the HP frequency, no?Quote:
Originally Posted by Guido
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.... :D
[Radius all the corners, maybe?]
Change the 1.7 uF to a 2.1 uF and see what happens.Quote:
Originally Posted by Zilch
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...:banghead:
What, forget to bevel the top, there?Quote:
Originally Posted by Mr. Widget
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.... :p]
Will do. I think i have some 0.39 uF's I can add here.... :)Quote:
Originally Posted by Giskard
It's begining to look like there is no "Quick and Dirty 4430"
Rob:applaud:
Yeah.... maybe this thread should be renamed the "Meandering Quick and Dirty Two-Way Speaker Thread".
:rotfl:
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....Quote:
Originally Posted by Robh3606
:p
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.