a monoblock is a loose term people use to describe a single channel amplifier.
Single channel is mono so a single channel amplifier is a mono amplifier. Somehow it often described as monoblock.
a prokick mono amplifier is a budget amplifier. Those who used it said it gives good amount of power but IMHO, not up to the claimed rated power.
woofer for RM1.5K ? I think you do not have to spend this much on subwoofer since it is better to spread the budget more on the amplifier. You should not end up like some users who bought expensive branded subwoofers but use over-rated amplifier to drive it i.e. those chap palang amps.