[JfTM]

I’ve recently noticed what sounds to me like a relay clicking on my 4BST. 

There does not seem to be a specific set of parameters to cause it, certainly not stressing the amp (after all I can hear the relay), it clicks once (each time), and doesn’t affect the music.

Something to be concerned about?

Thanks

[rmurray]

  Is the clicking audible through the amp or just a mechanical expansion of those metal covers between the heat sink sections?

[JfTM]

  Is the clicking audible through the amp or just a mechanical expansion of those metal covers between the heat sink sections?

Good point, I hadn't thought of that.

There is no audible impact on the sound through the amplifier, so it may well be metal expansion.

[rmurray]

Good, could be that's all it is. My 4bst does this occasionally when the air temp is high.

[JfTM]

Good, could be that's all it is. My 4bst does this occasionally when the air temp is high.

That's what it is. 

Funny I never noticed it before.

Thanks!