Search:

Hi Rusnzha

Yeah, looks funny, huh? The power circuit shares the heatsink design used for the left and right channel circuits. The left and right circuits are opposite each other on the chassis...

Hi Zilch, Bo, Rusnzha, JBL enthusiasts-

Here is my latest experiment. The PAS-3 and ST-120 are newly aquired eBay additions. The PAS-3 still needs four 12AX7, and the ST-120 is in need of...

Hi Zilch, Bo, JBL enthusiasts

I've been listening to my modified 4311B's for some weeks now. So far, I've found the most significant improvement by changing amplifiers.
...

Hi Zilch. Bo, JBL enthusiasts

Here's the latest modification, with 104H-2 replacing the LE5-10 midrange drivers. The speakers do sound less harsh with the 104H-2. Listening over time will tell.
...

to Zilch, Bo, JBL enthusiasts

Hi Zilch. Okay, here's part of the puzzle, a pic of the back of one of my 123A-3 woofers.

http://i70.photobucket.com/albums/i91/KenMiles/JBL_123A-3_001.jpg
This...

Hi Zilch, Bo, JBL enthusiasts

I'd been auditioning my modified 4311B's for a little over three weeks now. When I cranked up the volume, it hurt my ears. I'd (foolishly) set the speakers were...

Hi Zilch, Bo, JBL enthusiasts-

Zilch, Homer was eating a doughnut when he'd realized why the high frequency passage shows then disappears. Homer'd forgotten he'd swapped the CD player! One is...

Hi Zilch.

Sorry this put you through so much. Homer is guessing polarity really mattered with the advent of subwoofers, but Homer's only guessing.

I've been listening to the modified 4311B's...

Wow- Homer had it all wrong but lucked out anyway! :blink:

The part I don't understand is, according to the schematic, if red is negative, why the woofer would push forward when battery positive...

Hi Zilch.

Homer is very reluctant to remove the woofers again. When he originally removed the 2213H's, the seal became an adhesive over the years which tore chips of particles away from the...

Pelly, what Homer gathers, (and Homer doesn't recall from exactly where) JBL's initial solutions to meet the current polarity standard came in a mixed bag- drivers were changed, some speakers were...

No recone, original 1979 or 1980 cones. My brother owned the 4311B's for most of these years but was SO desperate to own a computer that I was able to trade a computer for my old JBL's. Talk about a...

Honestly, Bo, I Homer Simpson’d it. I'm unable to comprehend Thiele-Small parameters. My intelligence has holes, kinda like Homer’s doughnuts.



Hi Zilch.

Thanks for the heads up. You’re...

Hi JBL world. Another newbee, not deeply knowledgeable with JBL. I've just installed D123-A3's (corrected polarity) in my 4311B's. I was curious how the older alnico magnet woofers would sound in...