Don't forget you have an amp stuffed into mst cd head units i had an alpine that could cook up quite nicely even got a high temp cut once

Absolutely, that's why I mentioned the 4x40W of my JVC. Modern headunits are probably worse, as they all seem to be in the power race... Accidentally grabbed the heatsink (mounted along the left side of the unit) once when remowing it from the dash without letting it cool - ouch!

/Michael