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I have a pair of JBL C38 speaker ( 16 ohm D130;075 drivers;N2600 crossovers). How efficient are these speakers? Any ideas? guesses?
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I think they are more sensitive than even that. I think I saw the same 101 db figure as well, perhaps on the Lansing Heritage site. I own them and C36s (1962) with a D-131/075 n2400. The C38s (1959) are louder than the 1978 Klipsch La Scalas I own. the Klipsch are rated at 104 db/W/4 feet (don't know why they used 4 ft.) I use a Rat Shack spl meter. I have played them with my Sherwood integrateds a S5000II and the S5000. Also a variety of other amps.
I derated my estimates due to age and wear-and-tear of the magnets...Cheers,
The D130 is among the most efficient cone drivers produced by JBL, with a sensitivity of 101 db/w/m. The tweeter is even more efficient but is adjusted downward to mate with the D130. They should be easily driven by a SET on the 16 ohm tap - some have only 4 and 8 ohm taps. If you want deep bass, consider adding a sub with a plate amp. The JBL crossover would really benefit from recapping with higher quality caps.
Thanks for the info!
Do you know anyone who can mod the N2600 crossovers?
If you would post your location, perhaps someone here is nearby who could do that work. It is just parts replacement and soldering, so many here could do it.
assuming the Alnico magnets are up to full charge, they can be quite efficient. I'd estimate on the order of 95 to 99dB, using today's measurements for efficiency.Your larger problem is that they'll likely need some work to be back up to original spec. While these drivers do age well, you don't know what kind of life they may have led and age does take its toll.
Cheers,
I never realized they were that efficient. As a kid I remember a pair of dynaco monblocks driving these. (My first HI-FI experience and taste of tubes!). The dynakits are long gone and now I have this crazy idea... How would these speakers sound driven by a SET amp? Shouldn't be a problem with effiencies near 99...
just a thought.
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