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Post by John on Feb 18, 2015 19:58:46 GMT
LOOK NICE
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Post by brian2957 on Feb 18, 2015 20:11:18 GMT
Looking good James . What are you using for doping and how are you going about it ?
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Post by istari_knight on Feb 18, 2015 20:15:16 GMT
THANKS JOHN  Not got it yet [hopefully tomorrow!] but its a Plastidip product, basically liquid rubber that remains supple/flexible when dry. I'll post up the details if it works  Plan is to give the cone's a thin coat all over & then increase the thickness around the voice coil until it "sounds right" - Not very technical I'm afraid, but fun ! |
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Post by brian2957 on Feb 18, 2015 20:19:59 GMT
Ta mate , I think this is a bit of a dying art so it'll be interesting to see how you get on . Hope your hearing's better than mine BTW |
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Post by istari_knight on Feb 18, 2015 20:21:16 GMT
Hope your hearing's better than mine You know it isn't !  |
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Post by MartinT on Feb 19, 2015 7:47:44 GMT
Be VERY careful you don't get any down that magnetic gap!
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Post by brian2957 on Feb 19, 2015 8:14:12 GMT
How are you applying the doping James . Brush ( do you need a special one ) or are you spraying it on ?
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Post by istari_knight on Feb 19, 2015 11:36:44 GMT
Be VERY careful you don't get any down that magnetic gap! Don't worry, it'll be well sealed prior to application  |
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Post by istari_knight on Feb 19, 2015 11:38:37 GMT
How are you applying the doping James . Brush ( do you need a special one ) or are you spraying it on ? Not sure yet Brian, I'll have to play with the stuff to see how feels... I'm not keen on the idea of brush strokes so will try to avoid that if possible but yes the liquid rubber comes in a pot with an applicator brush - Its like applying black honey by the looks of it. |
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Post by istari_knight on Feb 21, 2015 14:23:58 GMT
Excuse the poor picture quality I was really having to "haul ass" as the gloop starts to dry after 5 minutes. Bare drivers with foam "bungs" in place to prevent any gloop finding its way into the voice coil gap.  First coat, I used the included applicator brush in the end... After experimenting with different things such as credit cards and sponges it just works best, not the prettiest finish but definitely the most even coverage.  Ready for the first thick coat around the centre of the cone, I shimmed it to prevent any finding its way where I didn't want it & also to provide a barrier for the compound to build up on. After applying this I left them to dry before having a listen sans inductors... Very interesting ! It sounded pretty good but still too much going on up top - It was congested sounding so I added another thick coat around the centre which seems to have done the trick.  Finito:    In hindsight I would have done them one driver at a time rather than both together, As it was the process of application/dry/listen/remove/application/listen gets quite laborious. |
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Post by MartinT on Feb 21, 2015 14:50:49 GMT
I may have missed this James, but what SQ were you trying to alter?
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Post by istari_knight on Feb 21, 2015 15:12:22 GMT
I may have missed this James, but what SQ were you trying to alter? Nothing & everything, simultaneously. Its more for a laugh than anything, as stated in the OP I've always respected Joe Akroyd's take on what makes a speaker good or in other words an engaging listen [neutrality is not the goal!] Must have been 12 months ago or so I noticed "the doc" of HFS describing how he's continued these fundamental ideas & developed them further using different methods/materials, other members were giving it a bash DIY and reporting good results so I thought I'd give it a go too... The mods pretty much fly in the face of accepted speaker design wisdom which makes it all the more naughty & exciting |
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Post by MartinT on Feb 21, 2015 15:18:06 GMT
Yes, I thought making the cones heavy and damped may give you a 'BBC sound', lacking in detail and dynamics.
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Post by istari_knight on Feb 21, 2015 15:29:07 GMT
Common sense would dictate so but the outcome is quite the opposite, they sound extremely dynamic... "live", "thwack", "like a drum skin" are words that spring to mind. Unless heard for yourself its hard to wrap your head around.
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Post by MartinT on Feb 21, 2015 16:07:33 GMT
Great - but surprising!
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Post by istari_knight on Feb 21, 2015 17:02:33 GMT
Maybe I'm just high off the fumes ?!  No, seriously... They are sounding much better  |
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Post by John on Feb 21, 2015 20:02:21 GMT
Lol
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Post by istari_knight on Feb 22, 2015 16:20:28 GMT
Further improvement today [mostly in the treble oddly] - I'm not complaining |
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