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Tannoy D500 Series 2 refoaming problem
Tannoy D500 Series 2 refoaming problem
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Old 16th July 2020, 11:09 AM   #1
duplex is offline duplex  Germany
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Default Tannoy D500 Series 2 refoaming problem

I own a pair of Tannoy D500 Series 2 for nearly 20 years now. Still sound great, lately collaborating with a newly revised Quad 303.

Now my Tannoys need a refoaming, see pics. First action: have a look inside to learn what's inside, and what to order. My problem: I can't get the speakers off the front panel. All four screws were removed easily, but both concentric and bass unit won't move a bit.

Accessing it from the bottom plate or the crossover panel failed, because the damping material (foam) cannot be removed from there.

Any ideas how to proceed?
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Old 16th July 2020, 12:01 PM   #2
Galu is online now Galu  Scotland
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Take a bolt which is slightly larger in diameter than a vacant mounting hole and tap it into the metal. You may then obtain enough purchase on pulling the bolt to start lifting the driver from its seating. It is probably stuck in place by a gasket of some sort.
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Old 16th July 2020, 03:14 PM   #3
C37 is offline C37  Belgium
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Quote:
Originally Posted by Galu View Post
Take a bolt which is slightly larger in diameter than a vacant mounting hole and tap it into the metal. You may then obtain enough purchase on pulling the bolt to start lifting the driver from its seating. It is probably stuck in place by a gasket of some sort.
Good tip- or get a spudge in plastic/Nylon to get some leverage. Careful with the wood... There is quite a large gasket of foam on the back of these drivers that has probably stuck after all these years.

Don't know what thickness the front panel is but on my tannoy actives it was 3 cm, and rebating them worked wonders in the mids for the dual concentric see: chamfering driver holes.
Last thing i beleive WD 40 would dissolve the glue between cone and suspension, i once had the stupid idea of cleaning the cone with it to make it shine and I'm pretty lucky i did not use more. To be confirmed.
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Old 16th July 2020, 03:24 PM   #4
duplex is offline duplex  Germany
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Quote:
Originally Posted by Galu View Post
Take a bolt which is slightly larger in diameter than a vacant mounting hole ...
Thanks, still trying to find something suitable. Mounting hole diameter is a bit more than 6 mm, so an M7 is certainly too much.
Tried an M6 with some tape, but this combination does not deliver enough friction. Working on it.
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Old 16th July 2020, 03:29 PM   #5
duplex is offline duplex  Germany
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Quote:
Originally Posted by C37 View Post
Last thing i beleive WD 40 would dissolve the glue between cone and suspension...
Well, I've got some WD 40 in the basement. Yet until now I did not consider to bring it upstairs to service my speakers. Anyway: thanks for the warning!
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Old 16th July 2020, 04:01 PM   #6
Galu is online now Galu  Scotland
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You could also place a small flat blade screwdriver inside the vacant mounting hole and gently try to lever the driver out from within the hole.

A suitably padded object of the appropriate height would have to be placed carefully on the wood surface to provide the necessary pivot point or fulcrum for the screwdriver.

The idea, of course, is to protect what is likely a real wood veneer finish at all costs. And, also to that end, I'd be very wary of applying WD40.
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Old 16th July 2020, 04:51 PM   #7
duplex is offline duplex  Germany
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Join Date: Sep 2015
Location: At the River Rhine
Quote:
Originally Posted by C37 View Post
Last thing i beleive WD 40 would dissolve the glue between cone and suspension...
Well, I've got some WD 40 in the basement. Yet until now I did not consider to bring it upstairs to service my speakers. Anyway: thanks for the warning!
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Old 16th July 2020, 05:04 PM   #8
duplex is offline duplex  Germany
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Join Date: Sep 2015
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Quote:
Originally Posted by Galu View Post
You could also place a small flat blade screwdriver inside the vacant mounting hole and gently try to lever the driver out from within the hole.
Thanks, found something better: it turned out that my Philips screw driver fits *exactly* in the mounting holes. Half a minute of gently increasing movements loosened the speaker. So far, so good.

Meanwhile I'm in contact with an England based company offering Tannoy service. They doubt that exactly the parts needed will still be available. Also I was told that they usually solve that kind of problem with shoe repair glue from the back side, if they can't get spare parts.

Has anyone some experience doing so? At least this sounds like a temporary patch until I find suitable spare parts.

Maybe I'll contact Tannoy service directly for parts.
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Old 16th July 2020, 06:35 PM   #9
Galu is online now Galu  Scotland
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Look for something identical to this stuff: Granville Black Silicone Sealant 40g | Halfords UK

I've used it on surrounds such as yours. It sets flexible, just like a new layer of rubber. Not to be confused with ordinary silicone sealant!

P.S. Glad your screwdriver trick worked!
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Old 16th July 2020, 06:45 PM   #10
MinMan is offline MinMan  United States
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You may be able to use RooGlue clear to mend the surround. That effectively upgrades foam surrounds.
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