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mods of failure re second hand chassis |
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valve head777 
Old Croc 
Joined: 27 July 2012 Location: East Sussex Status: Offline Points: 1781 |
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 Topic: mods of failure re second hand chassisPosted: 19 February 2018 at 8:31pm |
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Scenario 1, cone destroyed due to excessive low frequency, unloading the cab.
Scenario 2, driver cooking for long period, destroyed voice coil due to long term clipping or too high long term power. How could you tell when buying s/h chassis as cheap option for recone? Which one to avoid? Edited by valve head777 - 19 February 2018 at 8:32pm |
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Freedom of choice, choice of freedom.
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ceharden
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Posted: 19 February 2018 at 8:39pm |
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Cut the cone out and pick the one that has a clean voice coil gap.
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valve head777
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Posted: 19 February 2018 at 8:46pm |
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So over heating of the motor assembly will degrade the magnetic flux meaning loss of effiency? Bit of a Russian roulette game....
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Freedom of choice, choice of freedom.
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ceharden
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Posted: 19 February 2018 at 8:56pm |
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No, the bigger issue is that a burnt out voice coil can sometimes get stuck in the gap and be a complete pain in the arse to remove, plus potentially leaving lots of sh1t behind. A cone which has just been ripped due to excessive low frequencies or being fitted in the wrong cab is unlikely to have damaged the chassis.
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Meat
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Joined: 05 June 2009 Location: Manc Status: Offline Points: 1514 |
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Posted: 19 February 2018 at 8:58pm |
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There's a 3rd. Dropped and shifted magnet. Might initially seem like overexcursion damage but it's game, set and match.
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Don't test the champignon sound
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valve head777
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Posted: 19 February 2018 at 9:17pm |
I have successfully recentred and glued xb magnet's in the past. However, it's normally heat that softens the glue up..... |
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valve head777
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Posted: 19 February 2018 at 9:19pm |
Decent workshop facility's and time will get a gap clean 98% of the time |
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Meat wrote: