FOX, dunno, but I have a similar setup, but with the empeg at the bottom... on a long drive with the CD player (and internal amp) near full, CDs in the player get almost too hot to touch, but the empeg barely reaches more than 45 degrees - and it stabilises at 43 degrees in my house.

I imagine this difference is because the empeg is below the CD unit... maybe worth trying, before voiding the warranty (if any) before fitting a fan?

HTH,

A.