Upgrading Vintage Dunlavys Issue

[mark*sf]

I've got a vintage pair of Dunlavy SC-III-A's and an S-I.CC from 2000 that I'm looking at upgrading the crossovers. My problem is that towards the end Dunlavy started recessing their backplates to be incredibly tight-fitting (see picture). Does anyone have any techniques beyond trying to push out from inside the speaker (not practical due to cabinet construction) without marring the finish?

TIA, Mark

 

[cowanaudio]

Don't waste your time and money destroying a perfectly good pair of speakers. John knew what he was doing, any changes will be for the worse.

 

[AllenB]

Maybe so. I was thinking you could get something like a dental pick through one of the screw holes, and pull.

 

[mark*sf]

I whole heartily agree that John knew what he was doing. I also know that there are sandcast resisters in the crossover and Solen non-bypassed caps. I am not attempting to redesign simply use higher quality parts that were not used 20 years ago.

 

[afa]

Use a short large diameter self tapper screw (to bite into the metal plate) and then use a claw hammer levered against a piece of suitable timber (to protect the surface of the cabinet)
And if it has a sealing gasket of some kind holding it in place, you might have to use a hair dryer to heat the plate, to soften the gasket to help facilitate removal.

good luck

 

[mark*sf]

That looks to be a promising approach. Thanks!

 

[AllenB]

sandcast resisters

High value tolerance, low temperature coefficient.

 

[AVWERK]

Unless you can do impulse response tests, swapping different parts in a seemingly upgrade on your part, you might shift parameters enough to shift what he strived hard for.

 

[rayma]

These were hand-tuned, you can't just sub different parts. This will not end well.

 

[mark*sf]

Unless you can do impulse response tests, swapping different parts in a seemingly upgrade on your part, you might shift parameters enough to shift what he strived hard for.

I do have the measurement equipment to ensure that I would not be changing values and these the response tests. While I am new to being a member of Audio Circle, I been in this hobby for over 40 years including stints as a service tech and audio circuit designer. Therefore, I am not concerned about that though appreciate the warning.

 

[mark*sf]

While I am new to being a member of Audio Circle,

Obviously as I have been a diyAudio member for years but largely lurking. I also am having this discussion in the Audio Circle forum.

 

[dake13]

Audio Note drivers are removed carefully with a corkscrew, but a thick screw will also work.

 

[johnnyk9]

Can I please get a copy of the SS 10” woofer crossover for the IIIa’s?
I will gladly pay.
Just the 10” related inductor and any tank circuit involved.
Thanksjohnny