I had the M80 v3 and recently updated to the HP M80 V4. I also use a sub. The new HP M80 v4 is a different animal than the regular M80. The music is more focused, cleaner and more dynamic. I am not saying the M80v4 is a bad speaker just the HP M80v4 takes it to another level. The price increase would be consument with upgraded performance. I found a noticeable improvement at any volume level.