JBL-4311's --- if they are in good condition I would grab them ASAP.
In the late 1960s to late 1970s, the JBL-4311 and the later released 4312 were basically the industry standard studio monitor. My own studio had a pair and they were the monitor source for recording and mixing many hit recordings. In fact, they were so good that I on my arrival at
the studio one morning, I discovered that over night someone had obviously found them so good that they just had to have them --- never saw them again !!!!!!!!!!!!
If I was going to be building a new studio and I required mid-field monitors, I would probably start searching for a pair.
If I remember correctly, the only difference between the studio and commercial version of the speakers was that the studio version were painted grey and the commercial version was either black or veneered (I can't remember which).
In my studio, I drove the speakers with a 250Watt valve amplifier that I designed and built (including a very special output transformer). I still have this amplifier in storage and intend to bring it back into operation within the next couple of months.
In my Lounge Room, I have a set of Tannoy Golds (absolutely amazing sound) that are driven by a Crown DC-300 amplifier and in my Media Room, for the front L/R speakers I have a set of Goodman Tri-Axiums mounted in the original sloping front, Sherwood enclosures and these are driven by a 150Watt Yamaha amplifier (far better sound than anything else I have heard for this purpose).
I also have a couple of Westrex 15" sub-speakers (they resonate at 25HZ if hung by rope on a clothes line) that are mounted in a couple of cabinets I built, along with a JBL 10" low mid, a JBL 5" high mid and a JBL horn for the tops (I can't recall the model numbers of the JBL speakers). These boxes are tri-amped with transistor based amplifiers that I designed. These two boxes can almost crack concrete if I wind up the amps. The total power being delivered to each of the boxes is in the order of 1200Watts RMS (note RMS not music power).
By the way, the Westrex speakers have a handle to carry them and I can only carry one at a time --- I think they weigh something like 40 - 50 KG each.
The lot being ALL vintage and I would put them up against virtually any speaker box on the market today, apart from possibly the Meyer studio monitor (can't recall the model -- could possibly be something like HR-1) as their clarity/sound is nothing short of frightening, BUT so is their price !!!!!
David
every time I heard them through the years they've easily struck me as definitely not flat.
