Anyone familiar with 2150?
A friend picked up a pair of these, in pretty good condition (he says). A curiosity that I'd never heard of before! It seems to be a 15" woofer with an LE-5 glued to the pole piece, but I can't make out the picture very well. Haven't seen them myself yet.
The brochure is available:
http://www.jblpro.com/pub/obsolete/2150.pdf
Apparently his are without any crossover. The proper crossover seems to be the 3125, also available at
http://www.jblproservice.com/pdf/Net...%20Network.pdf
which seems to be a simplified 3120.
Anyhow, does anyone recognize these? Or know anything about them? I'm especially curious about how such a beast came about, and how long it lasted.
2 Attachment(s)
A curiosity that I'd never heard of before
Quote:
Originally Posted by
Paul Joppa
...Anyhow, does anyone recognize these? Or know anything about them? I'm especially curious about how such a beast came about, and how long it lasted.
Would like to repeat the question - maybe someone likes to shed some more light over this one, this time - or even tell us the full story behind?
Thanks.
2150 Composite Transducer
Paul...there's a guy in Oklahoma who designed a 14 cu' (?!) ported enclosure for JBL 2150s that is tuned for 34 Hz. He likes the transients the 2150's stiff cone suspension offers, and I like the imaging one gets from the centrally located LE5-2 in the 15" D130 basket. I'm presently listening to a pair of 2150s in 6.4 cu' ported utility enclosures. Although I read LE5-2s extend out to 15 kHz, I'm currently using them for the mids and added a pair of 175 drivers with 1200 kHz horns and L94 lenses for the highs. These speakers have great detail and require very little power to make a lot of sound. But the bass is too boomy...mid/upper bass?...for my tastes. I have a single 2150 that is looking for a home, and awhile back I came across two more NOS 2150s that are still in their JBL shipping boxes. Norm (the guy from OK) kindly sent me drawings for his refrigerator size enclosure. I'm going to build one as a test. If the 2150 sounds as good in it is I hope it does, I'll build 2 more, one for the other main front and one, laid on its side, as the center channel. I'm thinking about building 2 dipole enclosures for the 2 other speakers that will result in an all-2150 surround system. I've heard that ideally, a surround system should have the same speakers all the way around. I think that may apply more to 5.1 music (SACD, DVD Audio, Blu-ray Audio) than 5.1 movies. We'll see how this works. If this sounds interesting, google jbl 2150 B39(big black box version 9). Norm goes into more detail in his article.
2150s have good pedigrees, an LE5-2 in a D130 frame, 4" edge wound copper ribbon voice coil, and massive Alnico V magnet structure. But as another contributor in this forum correctly stated, the 2150 was designed for distributed sound systems in which they would typically be ceiling mounted. JBL gave the 2150 a stiff suspension to prevent the cones from sagging when ceiling mounted. This improves transients, a good thing. But it also results in attenuated lows, a bad thing. RF is 55 Hz. That's where Norm's 34 Hz, 14 cu', enclosure comes in.
The only problem I have is that I don't know where I'll put these things if I build them. But if I applied common sense to my hobby, I'd have to change hobbies.