6adc6b55   
   XPost: uk.rec.audio   
   From: E1ron@hotmail.com   
      
   On 10/09/2010 08:47, Andre Jute wrote:   
   > Paul G asks:   
   > "[W]hat is the best way to protect a   
   > speaker from destruction if the amp is sufficiently powerful, and you   
   > have no control over volume? It happens.... the kids have fun with   
   > your stereo, the grounds come loose on the inputs (huge buzz), the   
   > system oscillates, etc."   
   >   
   > I don't know if you want to design and build your own stuff from   
   > scratch, Paul, or merely want to buy a plug-in protector. If you can   
   > solder, here's a halfway house in a couple items to protect your   
   > loudspeakers from switch-on pops and from DC.   
   >   
   > Velleman K4700 Loudspeaker protection kit, stereo with switch-on delay   
   >   
   > Velleman K4701 Loudspeaker DC-protection, mono   
   >   
   > The reason I've identified them is that I have a QUAD 405 MkII which   
   > occasionally eats an ESL-63, which soon gets expensive, and it is   
   > tricky rebuilding them because here is no way to solder except over   
   > the fragile panels... So an audiophile's fancy turns to ripping out   
   > the 405's inadequate clamp circuit and replacing it with industrial   
   > strength protection.   
      
   I would fit a sensor that detects the onset of ionization and instantly   
   shorts the input to ground with a triac.   
   And maybe a soft-clipping circuit that works a few dB below the shutdown   
   level.   
   I can't think why Peter Walker didn't think of doing it....   
      
   --   
   Eiron.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)