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Can this be doped ?

Posted: Wed Feb 22, 2017 4:56 pm
by karatestu
Image

It is a 5" Mordaunt Short mid/bass out of a pair of MS902S small bookshelf speakers.

There is no dust cap the cone is continuous .

Thanks, Stu

Re: Can this be doped ?

Posted: Wed Feb 22, 2017 5:00 pm
by Daniel Quinn
What is it made off ?

Re: Can this be doped ?

Posted: Wed Feb 22, 2017 5:09 pm
by Dr Bunsen Honeydew
Not a clue, would have to look at it to judge.

Re: Can this be doped ?

Posted: Wed Feb 22, 2017 5:30 pm
by karatestu
I have no idea what it is made of..........goes off to google it

Re: Can this be doped ?

Posted: Wed Feb 22, 2017 5:57 pm
by Daniel Quinn
It is made of aluminium cpc , which I understand is aluminium mixed with other metals. may be problems .

doc uses bison kit , the driver will not be porous and thus the glue may not take .

Bison is solvent based , this may react with the metal ,it will presumably be very thin.

The docs uses the dust cover and voice coil as a natural way of ensuring more damping is applied to the centre of the driver . This is not possible . I have no idea is an even coat of the material would be okay .

Re: Can this be doped ?

Posted: Wed Feb 22, 2017 6:07 pm
by karatestu
Thanks Daniel,

I had failed to find any info on the driver. I will not bother with this one. There is enough to do on my hifi list anyway.

Stu

Re: Can this be doped ?

Posted: Wed Feb 22, 2017 6:37 pm
by Dr Bunsen Honeydew
Give it a joint and see if it makes better music.

Doping, get it :happy-smileyflower:

Re: Can this be doped ?

Posted: Wed Feb 22, 2017 7:29 pm
by karatestu
:obscene-smokingjoint: :obscene-smokingjoint: :clap:

Re: Can this be doped ?

Posted: Tue Aug 08, 2017 9:03 am
by karatestu
I am going to have a go at doping this with bison kit.

The crossover of these speakers are already minimal - single series inductor on mid/bass & 2.2uf + 1.2uf in parallel (3.4uf) on the tweeter. If I could get rid of the inductor that would be good. The 3.4uf could be replaced by a 3.3uf Russian pio I got from ebay and maybe a series padding resistor to suit.

Thinking of trying to dope the tweeter also with a very thin coat of plastidip to the entire metal dome. Having not done any doping before this could go seriously tits up - especially the tweeter. :shock:

Re: Can this be doped ?

Posted: Tue Aug 08, 2017 9:14 am
by Dr Bunsen Honeydew
You only really learn by doing.