Looking them over, new spiders, rubber surrounds, dust covers...... all 4 look great. Just need to trim the holes I'll be using to secure them into the boxes. Now, to get them installed and tested with the WOPL.
From my L100 owners manual it says the recommended amplifier is 150wpc continuous. JBL was very conservative back in the day. The 50W was likely a reference to a 50W RMS continuous test tone at 1KHz (hard on the midrange which kicks in at 500Hz). With the excellent JBL crossovers, I doubt you can damage a L100 with anything less than 250W peak musical power, and by then your ears would be bleeding. This is assuming a quality amp like a Phase Linear, if the amp is clipping, the speakers should be de-rated to a power level below the clipping threshold.
Having said that, the L100 is a high-quality listening room speaker, not a PA speaker. The L100 is a sensitive speaker at 90db/W/m and excels at sophisticated, critical-listening sound levels. However, from a recent test:
"Timing, that ability to deliver the interplay of instruments with confidence, is good enough for the L100s to convey the changing momentum of the music well. If you want punch and purpose these speakers are definitely for you. Surprisingly, they remain engaging at lower volume levels where alternatives start to sound lifeless, so late night listening remains firmly on the menu. Then we play Massive Attack’s Heligoland and the JBL’s sonic presentation works well. They are in their element, throwing out a wall of sound that impresses with its scale, drive and energy. They’re composed, even at high levels, and have a huge amount of headroom with dynamics."
Yes, your are correct, the early L100 crossovers were well-designed and gave the speakers their initial popularity. Later, the cost-cutting arm of Harmon attacked the JBL speakers and the result was a L100 crossover that sounded good when the the volume was loud but sort of muddy when the volume was lowered. So buy the vintage L100 with the N112 (I think) crossovers. See what I mean:
Early L100 Crossover .............Later L100 Crossover
Temporarily installed my woofer to give the Epicure 20+'s a shakedown before I tear them apart for a face lift. Don't know when I'll get a chance to do that but I'm in no hurry. They are in great shape if you overlook the dust and the Ferro-Fluid on the tweeters. I have several sets of them to make the speakers look better.