I've been using a Ashdown ABM1000 digital head 1000w RMS 2000w peak & I had my 12" root masters upgrade with Sica neo drivers to handle it .I've started using My ABM neo 400 ,500w rms 1000w peak as it has a different voicing more suited to the type of stuff I'm doing at the moment , with a RM15" & 2x10RM cabs ..as I have another ABM15 neo cab that I don't use only because of the weight , I thought as it has a higher speck driver I'll put the 15" neo into my RM cab .what I found interesting was that the White RM speaker placed in the ABM cab sounded virtually the same but obviously at a lower watt rating , But the Sica 15" put into the RM cab had a lot less bass than the White line speaker when I thought it would have the opposite effect .