Well heres the ratings for the memphis 16-mcd4kw
MOJO Series Monoblock Class D 4000W Max Amplifer
RMS Power Rating:
4 ohms: 1000 watts x 1 chan.
2 ohms: 2000 watts x 1 chan.
1 ohm: 4000 watts x 1 chan.
Max power output: 4000 watts x 1 chan.
Heres the ratings for the RD-
RMS power, .875...