After few never ending discussions and ramblings I had bought Z1 Compact last week along with Sony XB920 (aka MDR-X10) anticipating that it could easily drive those 50mm, 24Ohms cans (Basshead).
I was quite disappointed after having it compared with my previous phone "WT19i, Live Walkman" which had better output over the Z1's. But I didn't quit there, I explored and bought the FIIO E6. I avoided USB DAC because this phone had a flap over the USBs and is really inconvenient to hook up DAC.
I must say, E6 filled the gap. The Bass, The Amplitude, all amped! I use PowerAMP for music, hasn't let me down. Being compact in size, I've been thinking to mod my second Nillkin Frost Case, and may be fix the amplifier at the back. Only thing which bothered me was the "Mini USB port" for charging on the E6, would have been convenient if it were a micro.
Would like to know if anyone has tried any other DAC or amp along with the pair of headphones used.