Audioduck
09-07-2013, 11:31 AM
Hi All,
I've just acquired a pair of VERY poorly JBL 4411 monitors that I have decided to put the effort into (pics to follow).
I learnt from the previous owner that he'd been running them without any surrounds in one of the woofers *sigh*.
Having got them home and up on the bench I decided to isolate the woofer and test the impedance to see if he's done any damage to the coil. Alas, I can't get the ruddy driver out of the enclosure!
This is my first experience with JBLs (previously only being a Mission, Tannoy or AR chap) so I don't know if there's a particular technique that needs to be employed. Is there? I've had a good look and I can only see the four screw/bolts. Would the factory have secured the driver with some sort of filler or caulking between the driver and the enclosure
It seems to be a bit of a recurring issue:
http://www.audioheritage.org/vbullet...r-removal-Help (http://www.audioheritage.org/vbulletin/showthread.php?21452-Classic-Studio-Monitor-woofer-removal-Help)!
http://www.audioheritage.org/vbullet...178#post233178 (http://www.audioheritage.org/vbulletin/showthread.php?23270-And-now-for-my-4311B-s&p=233178#post233178)
http://www.audioheritage.org/vbullet...woofer-removal (http://www.audioheritage.org/vbulletin/showthread.php?24038-L100-woofer-removal)
Which way to go?
I've tried tapping. I've tried wheedling at the edge with a screwdriver (reluctant to damage the enclosures any more than they are).
Where next?
Also, do any of you have a schematic for the crossover of the 4411 with capacitor requirements? I'd like to recap as these poor boxes to bring them up to date.
Cheers,
Matt
I've just acquired a pair of VERY poorly JBL 4411 monitors that I have decided to put the effort into (pics to follow).
I learnt from the previous owner that he'd been running them without any surrounds in one of the woofers *sigh*.
Having got them home and up on the bench I decided to isolate the woofer and test the impedance to see if he's done any damage to the coil. Alas, I can't get the ruddy driver out of the enclosure!
This is my first experience with JBLs (previously only being a Mission, Tannoy or AR chap) so I don't know if there's a particular technique that needs to be employed. Is there? I've had a good look and I can only see the four screw/bolts. Would the factory have secured the driver with some sort of filler or caulking between the driver and the enclosure
It seems to be a bit of a recurring issue:
http://www.audioheritage.org/vbullet...r-removal-Help (http://www.audioheritage.org/vbulletin/showthread.php?21452-Classic-Studio-Monitor-woofer-removal-Help)!
http://www.audioheritage.org/vbullet...178#post233178 (http://www.audioheritage.org/vbulletin/showthread.php?23270-And-now-for-my-4311B-s&p=233178#post233178)
http://www.audioheritage.org/vbullet...woofer-removal (http://www.audioheritage.org/vbulletin/showthread.php?24038-L100-woofer-removal)
Which way to go?
I've tried tapping. I've tried wheedling at the edge with a screwdriver (reluctant to damage the enclosures any more than they are).
Where next?
Also, do any of you have a schematic for the crossover of the 4411 with capacitor requirements? I'd like to recap as these poor boxes to bring them up to date.
Cheers,
Matt