I just happen to have a 6-page color brochure on the L Series. I must have picked this up in 1981 when I bought my system before military discharge. I have the Radiance series. Anyway, I can make you a copy/fax if you're interested. Here's a bit of info:
"The L60T proides professional sound in the home environment. The elegant two-way, floor standing system, with an 8-inch low frequency transducer, teams JBLs renowned titanium highfrequency transducer (O35Ti) with a laminated high polymercone mid/low frequency transducer. The result is a sensitiity of 88db at 1 Watt/1 meter, a continuous power rating of 120 watts, and a dynamic power rating of 480 Watts (peak IEC shaped noise). The all-wood veneer l60T provides extended bass response at high power levels for startling realism."
8-inch polymer laminate low frequency transduer
1-inch high frequency transducer with pure titanium disphragm
Sensitivity: 8db SPL2.83 volts at 1 meter
Frequency Response: -6dB at 35Hz and 27kHz, +2.5dB from 45hZ to 20 kHz
Power Handling: 120 watts continuous, 480 watts peak IEC shaped noise