High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

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RE: By way of explaination....

Posted by weltersys on January 15, 2017 at 07:28:24:
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