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For my portable speaker, I converted an old pair of Paradigm ADP150 Bi-pole surround speakers.

Had to replace the rotted foam woofer surrounds and replace the single crossover to dual crossover to separate the L/R speaker channels.

The audio is a piZero W with HiFiBerry Amp2 and 128g sd card. Also sdded 6 button controller and MQTT broker support when connected to the internet. 

All my music is with me wherever I bring the speaker even if there is no internet.

[Image: AEfnATm.png]
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Very nice!

I love projects which re-purpose old tech.

Regards,
Kent
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@normand  Looks very useful ! and tidy build.

Those 'rotted foam' surrounds were used by so many manufacturers and proved to be the weak link in otherwise well made drivers.
After having to replace them (twice) on the passive radiators in mine I spent a lot of time finding, fitting, and re-configuring them with rubber surrounds.

On the other side of the coin my very first set of drivers and speaker build from 1978 are still working and in daily use. Kef with rubber surrounds...and the occasional application of oil of wintergreen to keep them supple and within spec.
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Oil of wintergreen?

I might try that on my vintage KEF Q60's although the surrounds are still like new and I'm not so sure about the minty smell from that oil ;-)
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(06-11-2020, 11:46 PM)Tim Curtis Wrote: Oil of wintergreen?

I might try that on my vintage KEF Q60's although the surrounds are still like new and I'm not so sure about the minty smell from that oil ;-)

If it ain't broke... Smile 

Yes, there is very little WAF in a living room reeking of sports therapy....and it takes several weeks to become bearable .... ask me how I know.. Wink 

Here is a good, well thought out and applied test of several treatments to 'soften' old hard rubber.
https://www.youtube.com/watch?v=EnGsllKvheQ
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Woah, a bucket of boiling oil on the grill :-0
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(06-11-2020, 09:35 PM)normand Wrote: For my portable speaker, I converted an old pair of Paradigm ADP150 Bi-pole surround speakers.

Had to replace the rotted foam woofer surrounds and replace the single  crossover to dual crossover to separate the L/R speaker channels.

The audio is a piZero W with HiFiBerry Amp2 and 128g sd card. Also sdded 6 button controller and MQTT broker support when connected to the  internet. 

All my music is with me wherever I bring the speaker even if there is no internet.

[Image: AEfnATm.png]

Coolness :-)

Where do u use it?
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Mostly camping and backyard.  Sometimes at farmers markets and even at event halls when they can't figure out their sound systems.
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I have a pair of Cambridge Audio R50 speakers bought second hand in 1982. They seem to get heavier as the years go by. Me getting weaker. The B139 and B110 rubber surrounds are still ok. The very earlier ones did rot away. Replacement drivers are still available here in the uk under the Falcon brand.
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@TheMetalHead Replacing the surrounds was easier than expected.  If anyone has similar problem with surrounds, don't be afraid to replace yourself.  Save a few bucks and upscale your old speakers that otherwise would have been destined for the trash.
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