CADCAM
Headphoneus Supremus
A friend of mine has an ED9 but I didn't really like it so I'll give the ED4 a shot. I was once a basshead but ever since I've had my B3P1 and Carbo Tenore my preferences have changed.
I don't have the ED4 so can't comment sorry.
Just make sure of a couple things with the ED9, first the tiny paper filters on the inside of the brass nozzles need to be in place...not curled up or missing. Also if you unscrew the nozzles there should be a screen inside the actual body in front of the driver. I call it a driver screen but could be wrong on that terminology...either way it should be there to protect the driver itself and also defuse some of the sound...
I also used a tiny bit of a porous air filter material in the nozzles to defuse the sound a bit more...great results.