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JBL AM4215/95 HF Driver Replacement
Erik Jerde:
Hey y’all. I’ve got some JBL AM4215/95’s flown in a church that I was brought in to tune which have blown HF drivers (2 of 4 boxes).
Speaker spec sheet here: https://jblpro.com/es/site_elements/am4215_95-spec-sheet
Before ordering parts (2407h) I was wondering if anyone has experience and advice for doing HF driver replacement on these. As it’ll require a lift rental and ordering parts I’d rather not get up in the air and find surprises that make things take longer.
Thanks!
Mike Caldwell:
--- Quote from: Erik Jerde on June 12, 2024, 06:17:56 PM ---Hey y’all. I’ve got some JBL AM4215/95’s flown in a church that I was brought in to tune which have blown HF drivers (2 of 4 boxes).
Speaker spec sheet here: https://jblpro.com/es/site_elements/am4215_95-spec-sheet
Before ordering parts (2407h) I was wondering if anyone has experience and advice for doing HF driver replacement on these. As it’ll require a lift rental and ordering parts I’d rather not get up in the air and find surprises that make things take longer.
Thanks!
--- End quote ---
I haven't opened up that exact speaker but others in that series you take the grill off and remove the horn. The driver maybe stuck on the horn, a strap wrench works to get it loose though you can change the diaphragm with the driver on the horn.
Clean the gap good and then some!
There are lots of cheap knock off diaphragms for those drivers, double check what you buy!
the 2407 is not the most robust abuse proof driver.
Chances are it's a blown diaphragm but you can't rule out damage to crossover as well.
Erik Jerde:
--- Quote from: Mike Caldwell on June 13, 2024, 04:49:31 PM ---I haven't opened up that exact speaker but others in that series you take the grill off and remove the horn. The driver maybe stuck on the horn, a strap wrench works to get it loose though you can change the diaphragm with the driver on the horn.
Clean the gap good and then some!
There are lots of cheap knock off diaphragms for those drivers, double check what you buy!
the 2407 is not the most robust abuse proof driver.
Chances are it's a blown diaphragm but you can't rule out damage to crossover as well.
--- End quote ---
Hey Mike, thanks for the reply. So the driver screws onto the horn? Regarding diaphragm replacement, any advice on sourcing quality replacement diaphragms? This PA is probably going to be replaced in the next year so I'd like to do the replacement as cheap as possible (while still being effective). I've done quite a few diaphragm replacements over the years so I'm well versed on cleaning the gap.
The box is being run bi-amped so I'm pretty sure the crossover shouldn't be an issue here.
Thanks!
Erik
Mike Caldwell:
Do a search for D8R2407, finding one in stock could be an issue.
Are that using the JBL settings for bi-amping?
Yes the driver is a screw on model.
Erik Jerde:
--- Quote from: Mike Caldwell on June 14, 2024, 02:41:40 PM ---Do a search for D8R2407, finding one in stock could be an issue.
Are that using the JBL settings for bi-amping?
Yes the driver is a screw on model.
--- End quote ---
I haven't had a chance to revisit the DSP settings since I ID'ed the speakers. Had to do the initial tune blind since the client didn't have record of what the boxes were and getting them ID'ed 25' in the air took some creative camera work. Hoping the initial install company setup the driverack 260 with the correct crossover etc. We'll see.
Related - there are 4 boxes in the hang, in pairs. Each pair has one HF driver blown. Do I replace all 4 so that they (in theory) match or are replacements usually close enough that it won't matter. Consider that the boxes are probably 20 years old (I think). Since they are in pairs I can't use DSP to adjust for differences in response between new and old drivers.
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