These are very muddy to start off with. But, these need burn-in(100 hours).I am using Brainwavz round pads that helped alot. I also covered the port partially. These need a very powerful amp, much more than the mach3's, I am using the emotiva BASX amp. A bright, crisp DAC will help, I am using the topping D50. Now these work well for my heavy music listing cans.