I just receive px-100 from Amazon to replace my old white px100 , which be break lately . after 20 hour continuous `` burn-in '' with professional burn-in cd , I be disappointed with this black version . compare to my old white px100 , the black version seem to be lack transparency , the music sound muffle , many detail lose . it do have better -lrb- stronger -rrb- bass , but that do not justify the loss of clarity and transparency . if you be go to buy px100 , I would highly recommend the white version , it be only $ 1.00 more in Amazon .