On 16/06/2016 00:07, Gareth Magennis wrote:

Aded back to back 4.7V zeners over the back to back 6.2V zener gate
protectors of the audio amp, as owner only goes to 60% volume.




You might want to reconsider that. Isn't that restricting the amps
headroom?



Gareth.

yes, going the wrong way, so removed.
On the air-movement lack of design, instead of drilling small screws
through the h/s
for the pcb mounting screws, they deep milled off the corners so making
it even less likely the air will pass through the restriction of the h/s
vanes