rockford fosgate 4040 dsm

[shadowm891 2]

hi guys have a question. i went threw some car audio stuff my brother owned back in 98 before he pass away and never knew about this stuff tell now. and i see he had this rockford fosgate 4040 dsm 4 channel amp that still work's and was told that this amp is a beast. but my question is what is the true rms rating per channel on this amp.

[liljestrand 244]

I see 35x4 @ 4ohm