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In Reply to: RE: By way of explaination.... posted by Uncle Mike on December 22, 2016 at 14:01:50
I use the JBL woofers in the 4331a enclosures with a SS amp crossed at 200Hz.
The mids are JBL 2118 passively crossed at 2500Hz into a Heil AMT and driven by my DIY 300b SET amps.
I don't want to play the JBL 15's all the way up to 800Hz and I know the horns won't play down to 200Hz.
I was thinking of trying the 2420/2312 crossed at 2500Hz in place of my Heil AMT tweeters.
What do you think?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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In Reply to: RE: By way of explaination.... posted by Uncle Mike on December 22, 2016 at 14:01:50
I use the JBL woofers in the 4331a enclosures with a SS amp crossed at 200Hz.
"The mids are JBL 2118 passively crossed at 2500Hz into a Heil AMT and driven by my DIY 300b SET amps.
I don't want to play the JBL 15's all the way up to 800Hz and I know the horns won't play down to 200Hz.
I was thinking of trying the 2420/2312 crossed at 2500Hz in place of my Heil AMT tweeters.
What do you think?
Tre'"
Tre,
I think the 2420 on the exponential horns you have, without the lens, is perhaps the most musical sounding HF driver I have ever listened to, on axis. They have only a 10 degree (or so) pattern at 16 kHz, but the narrowing pattern flattens the falling HF response of the 2420.
I used them in my 1979 sound system stage monitors.
For around 8 months while building that system, I used a clock radio to drive one of the active two-way monitors, which had an EV-15L (I preferred the EV woofers over the JBLs of that era) and the 2420/horn had a protection capacitor (18 MFD, IIRC) which passively put it in around 800 Hz or so, the 6 dB per octave transition worked well with the EV-15L raw response.
With less than a watt, the speaker was loud enough to "get over" the noise of saws and belt sanders, yet was very "high fi" on axis. Since most of my work was done at a bench, the narrow HF dispersion was fine, and also made life more livable for my friend who worked at a desk 30 feet away in the same basement.
Art "Memory Lane" Welter
That's confidence inspiring.
I mean, taken with the caveat that you were working in a noisy environment it's hard to say, but at least it gives me the confidence to stick with what i have and try and work with it rather than just dump everything and try something else. Resale on used 2420's isn't quite enough for me to recoup my costs if I cannibalize my 4331s.
Now your over my head.... What I did was with Zilch's(God bless him) mentoring some years ago.
The guys at Lansing Heritage are the ones you want to discuss those particulars.
I drive my L200's with either a Citation II or an LK150, both updated and somewhat modified. They are efficient, as you know, so there is plenty from either amp to drive them. I'm happy with where I have gotten them now.
I guess what gets me is why break up a fine set of speakers? Why not use them as intended or at least put them back and reevaluate.
Edits: 12/23/16 12/23/16
"I guess what gets me is why break up a fine set of speakers? Why not use them as intended or at least put them back and reevaluate."
Because I'm not a gear head.
I'm not interested in owning a classic speaker just because it's a classic speaker. I want the best sound I can get and IMO using the JBL 15s the way I do gives me the best sound.
IMO a 15 woofer doesn't sound good playing higher than 100Hz but it's hard to find a really good midrange speaker that is both efficient and will play properly all the way down to 100Hz so I have to cross at 200Hz.
I need really efficient speakers for the midrange and highs because, for that range, I use single ended 300b amplifiers (not a lot of power) because I think they sound much better than push pull amplifiers but they don't have enough damping factor to play bass so I bi-amp with SS for the woofers.
I could put the 4331As back together and sell them and then buy some 2231s or 2235s and build woofer boxes but I'm lazy these days and I already have the (very well built) 4331 cabs.
It's not that I don't understand where you're coming from but if I hang on to the horns and crossovers my wife and daughter can sell the complete 4331As after I'm dead but life is too short to worry about breaking up "a fine set of speakers".
Thanks for your input.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I had a similar rig like you way back and I used the 2480 in a large 200hz first octave audio horn crossed at 300hz and then at 6k it was awsome with my 300b
I think this is the best jbl midrange driver ever ,i moved on to altec and the 515b with 288g tickles me silly
I have thought about going all horns on top.
At one time I had 416s in a Karlson enclosures with 511s (I can't remember what drivers) and 075s.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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