Purchase by chance (I'm a fan of JBL), a studio that kept its activity.
I use them in the monitoring room (75m2) with a stereo amp Denon pma 501 2x100W large transformers that "old" (it dates back 70 ').
4 ohm speaker. PASSIVE SPEAKER (AF mistake on the site)

SOUNDS

I love the sound, not too farting, fairly neutral, which has nothing to do with the speakers I would call "modern" (Genelec, Alesis, etc. ....). Indeed it is the origin of high-end audiophile speakers.
An incredible return means all instruments with an extremely accurate stereo image in the placement of pan.
You can set the presence and brightness by two pots.
There's nothing more difficult than comparing listen because too many factors involved to judge (amp, shape of the piece, style of music ears ...)
Anyway, for me they are fabulous ....

OVERALL OPINION

I have 10 years and I adorre.
cot least they are a bit bulky and heavy.
For the report qualitprix seen that I have purchase (about 3500f) it's all good.
Against by the time the original price was prohibitive (+ 10 000f pair)!
I do not part with it ... never .... ever ....!