Okay, so just recently I bought the MTPC and MTPG from the refurb deal that went on. I burned both of them in for 100hours a peice (with brown, white, and pink alternations with 10min breaks). I was doing an A and B comparison between the two with an RSA predator linked to an Ipod touch. For all intensive purposes I listened to my customs (TF10 reshells) and my standard Monster Turbines. Then I took at a listen to the Copper and the Golds. Both of them have a decent amount of bass; however, I couldn't hear a "significant" difference in the low spectra. The coppers are way more detailed in the highs (sparkles a lot more than the golds). It may be my ears, but the bass in the golds fell short of what I expected? A lot less than my TF10 reshells and the monster turbines... Seal is not an issue as I was using the same tips from my MTs. I expected the MTPC to sound the way they do (and omg they are so sexy); however, not the MTPGs.
Track sample used: Bar 9 - Strung out (dubstep. Not a fan of dubstep but it is the most bass extensive song I could find with the exception of Slipknot)