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Re: JBL Signature series components

24.9.59.79

Posted by Paul Joppa on April 30, 2000 at 16:43:13

In Reply to: JBL Signature series components posted by Kelly B. on April 29, 2000 at 20:04:53:

Do you have some original JBL N2400 crossovers? I have a single N2400, which measures more like 1600Hz electrical crossover (not the nominal 2400Hz). This is a classic combination, a clear improvement over the "full-range" D-130s alone. (I can get the resistor and capacitor values, and estimate the inductances, if you need it.)

The only other combinations recommended by JBL in those days that used the D130 were with the small-format compression drivers (LE175/2410 or LE85/2420) with either the "potato-masher" or the HL-91 slant-plate lens. In those cases, the 1200-Hz N1200 crossover was used. I have a single old one, but it's potted in some kind of gook and I can't determine exactly what the component values are. The choke shunting the tweeter was tapped at 3-dB intervals for a high-frequency level control without resistors, a pretty cool trick. Otherwise I think it is basically a 12dB/octave standard crossover.

According to my JBL "Loudspeaker Enclosure Construction Manual" (Publication CF802; I can't find a date but probably late '60s) the following cabinet volumes and ports were recommended. Volume is in cubic feet, port is square inches.

Volume Port
4.1-5.0 25
5.1-6.0 35
6.1-7.0 50
7.1-8.0 65
8.1-9.0 80
9.1-10. 90

Be sure to brace the heck out of it - these big cabinets like to sing along with the music!

These things are a little colored, especially on classical. I find I get used to it pretty quickly, and I love the immediacy and dynamics. They are terrific with rock, and a lot of other stuff. I'm listening currently to 2220's (closely related to D130's) and the bigger drivers (2440) with the slant-plate lens, crossed at 800Hz. Life is grand.

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