Used an Ashdown ABM 500 head, although they sounded similar, the NV610 sounded so much better. I know this is a popular trend on this forum, but I'm an Amateur player compared to many of you, so I wanted to give an Amateur's perspective. I've played both many times before, but I had an all day practice today with both in the room, so my speakon cable was going back and forth. Where does the magic of NV610 come from? I'm imagining the custom designed drivers?