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View Full Version : Woo hoo!! SR 4722 project!



chad
01-13-2006, 06:39 AM
Woo hoo!!

SR 4722 project... just bought these. So I have cabinets, xovers, grilles, and cannot wait to start some assembly...

Zilch
01-13-2006, 10:10 AM
http://www.jblproservice.com/pdf/SR-Series/SR4722.pdf

andresohc
01-13-2006, 06:59 PM
I did the similar thing building a pair from components and parts. Love that speaker.

chad
03-02-2006, 03:29 AM
Ok, the 4722's are complete. I need to post pics maybe.

Upon the first listen, the highs from both speakers sounded pinched and just plain wrong. I immediately knew why... I had tried to *rescue the overcooked diaphragms in the 2416's. No love just yet. So, I had another complete 2416 that I know is good, so I installed it and attempted to rescue another cooked diaphragm for the other speaker. TaDa!!!! Success. I only have a 75 watt per channel amp available right now, can't wait to hear them with real power.

* Rescue: the 2416's, when used in a high volume (especially live sound) application, are famous for developing blisters on the inside of the coil former. The blisters increase the thickness of the former/coil, and it binds in the gap, causing the pinched sound. I read a post somewhere on this forum where someone actually sanded the blisters with sand paper, and restored the sound of the 2416, so I gave it a try. I'm semi-successful thus far! By the way, I found that an empty toilet paper tube, with 400 grit wrapped around it, is like a perfect tool for sanding the interior of the former :D.

Zilch
03-02-2006, 12:15 PM
Compare crossovers:

http://www.jblproservice.com/pdf/SR-Series/SR4722.pdf

http://manuals.harman.com/JBL/HOM/Technical%20Sheet/L200t3%20ts.pdf