Well, I've done it again. In this case, tonight I was being a "Renegade of Funk" and I guess I had just a little bit too much "Rage Against The Machine" and fed my 901 II (x 4) up to redline of the NU6000 -- presumably 3000 w/ch into 4 Ohms. Each 901 II is rated at peak 400 W/8 Ohm, so 800 peak into 4 Ohms. Oops. Now I get the tell-tale crackle indicating an unhappy driver or two. Fortunately I am skilled in the art of scavenging 901 drivers, and even was going to assemble a "new" one from scratch. But now I have an unexpected repair.
Ok, enough already with the gasbag introduction. the point? Ah yes, the point! This is applicable to any dynamic driver of course, but what are the options, if any, for repairing working but buzzy or noisy speaker drivers? Also, how about treatments for the ancient (around 40 years!) paper cones? They often crumble at a finger poke...probably they were a bit sturdier than that when new. Any magic oils, varnishes, etc?
From sorting out dubious ones (when I buy a specimen), I usually give up on the obvious duds (cone or coil seized, won't move at all, etc.) But I am going to see if I can make the magnetic cat toy from one of them :)
Yours truly,
Soldermizer...slowly turning his several pair of old 901's into less and less as the months go by :(
Inventor of the "Hosed 900 1/2" !!!
Ok, enough already with the gasbag introduction. the point? Ah yes, the point! This is applicable to any dynamic driver of course, but what are the options, if any, for repairing working but buzzy or noisy speaker drivers? Also, how about treatments for the ancient (around 40 years!) paper cones? They often crumble at a finger poke...probably they were a bit sturdier than that when new. Any magic oils, varnishes, etc?
From sorting out dubious ones (when I buy a specimen), I usually give up on the obvious duds (cone or coil seized, won't move at all, etc.) But I am going to see if I can make the magnetic cat toy from one of them :)
Yours truly,
Soldermizer...slowly turning his several pair of old 901's into less and less as the months go by :(
Inventor of the "Hosed 900 1/2" !!!