Although I don't like dubstep, I listen to a lot of electronic music, extensively through 11s and 40s. Properly amplified (such as by ATC's own amp, as you suggest) the 19s will be marvellous. Depending on what kit you've heard before, tho, it may take a bit of getting used to. Speakers like the RX6s have more 'showroom appeal' for bass, but with time you will realise that (compared to ATC) you are getting boomy / distorted / uneven bass. ATC's bass is very accurate and, whilst it rolls off relatively early as it is a sealed box design, gives you a very good representation of what's on the record. Ie if there is bass there, you'll hear it how it's meant to sound, well integrated with the rest of the frequency range.