IMO, it's probably better without the boot for heat dissapation. The new amps also have airhole slots on the plate whereas the old ones did not (the amp chamber is now sealed internally with MDF). Another 5 hours so far today with no problems!

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7