Replacing HF compression diaphragms...

[DAVID_L_PERRY]

Just thought I would share my experiences for anybody else who may need to do this at some point.

I replaced a 16ohm diaphragm in one of my JBL 1" drivers in my stage monitors with an 8ohm to match the other cabs and new crossovers which where made for 8ohm drivers.

I tested the diaphragm with my mulitmeter before I installed it and it read 6ohms - no problem - thats about right.

Once I installed the diaphragm I thought I would just check it again...it now measured around 17ohms....

I removed the back off the driver and checked the connecting wires and found that the spade of the short wire connecting the diaphragm onto the chassis was fixed with a bolt that had some corrosion on its head. Sure enough this corrosion at the fixing point measured at about 10ohms resistance. Once cleaned up and replace it was back to the expected 6ohms.

I need to check out my other monitor cab as that has the same jbl drivers and came from the same source.

Hope this may be of interest.

Dave

[chopperguy99]

Maintaining old cabinets is really important, although not many of us do it like we should. A little time, a new input jack or two, solder a few connections...etc, and they will perform as good as they can. Guess I better open up the old SP-2' this weekend!

[DAVID_L_PERRY]

Maintaining old cabinets is really important, although not many of us do it like we should. A little time, a new input jack or two, solder a few connections...etc, and they will perform as good as they can. Guess I better open up the old SP-2' this weekend!

Indeed.....
this is the monitor before:- http://www.frappr.com/?a=viewphoto&id=1 ... myphotos=1

and after.....
http://www.frappr.com/?a=viewphoto&id=1 ... id=3294354

New Grills new crossover, new paint same rusty JBL 1" driver....
Same heavy weight JBL2226 15" driver....