I am surprised that no one has mentioned that the higher impedance of theT51 as against the T50 makes it less sensitive for direct use from an iPhone. Whereas the T50 always has a bit in hand the T51 often needs full volume. Apart from this the sound is definitely improved removing a metallic coloration from the T50 sound.
I have confirmed that the impedance of T51p is 60 ohms whereas T50p is 32ohms. This difference in impedance means that the T51s are less sensitive and will require higher volume settings. On an iPhone5, for example, the T51s need the full volume with the slider fully over to the right whereas the T50ps are as loud with they slider backed off a couple of centimetres. The higher impedance does improve the sound with a more level frequency response and more rapid transients and this is obviously why Beyer have done it but they should, perhaps, point out the trade off in sensitivity as they do with their other ranges.
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