RMB8's are midbass and need to be bandpassed from about 50 to 250 Hz. Set your amp for 50Hz hipass mode 24 db/oct and also put some inline 200-250 Hz lowpass filters in series with the RCA cables. If you play RMB8's lower than 50 hz they hit xmax with only 50 watts. Over 250 hz they sound muddy.