The 425 is good, but somewhat overly bright, and although there is bass there, it's not really authoritative. The 535 puts "meat on the bones" so to speak, and adds weight and depth to the bass. I own both and use the 425 when I'm walking outside and when I'm playing my electronic drums, while the 535s are for critical listening. One caveat - if your source electronics has any kind of a hum or buzz the 535 will expose it mercilessly.
3/22/17 at 7:09pm