Hello i played threw many of these amp's way back, loved the sound they made ,ev 15's and double 18's i think they were like 2 inches thick and it may have been fiberboard i'm not sure but they wieghed a ton, that kept me away ,at that time i went for a kustom 2 -15 amp and cabinet in cascade color, did'nt sound as good as the road stuff but at least i could carry it(man that stuff had to be the heavest gear there was.