So here is a brief non technical review of the Gold series
I listen to mostly Rock
all listening was done on either Zune HD or Razr Hd no amps Dac etc .mp3 at 320 or streaming from google
there all plastic but seem to be built well ,the headphone cable is 2mm and 3mm ends ,I was worried at first when i plugged the cable into the headphone it didn't seem to click or lock but does so now
the Clamping force is there they will not fall off your head ,but isn't uncomfortable .I had them on for a solid 3 hrs without taking them off
The ear pads can get warm but not hot
the NFC/bluetooth synced with no problem to my phone
The headphones can be used with or without power turned on(internal amp)
the first couple hours they sound boomy but that has since gone after playing them for 5+hours
On the wireless side of them ,playing with the noise canceling on they seem to be heavier on the bass but not unpleasant ,without they sound good too almost neutral with a ever so slight boost in mid and bass,either way I find I like the sound
when switching from on to off there is a dip in the sound but it adjusts back within 2-3 seconds
I didn't find to be much of a difference in the way they sound wireless or wired which is great
you can also use the Noise canceling with them wired which is nice to have that option
I listened to Pink Floyd,Five Finger Death Punch, Amos Lee, SRV, Candlebox, and not one time did I feel that they distorted or went beyond there limit
They will be keepers for me
hope this helps some if they where curious about them as I was