So far I have considered these amps:
Refurbished Arrow 3G
Refurbished Arrow 4T
Thank you for your help :)
With and without an amp yes, I didn't hear that much of a difference with low-impedence cans (Momentum etc) but when I tried something like the HD 600 there was an audible difference and I suspected that they weren't been driven properly with the in-built DX50 amp.
I'm looking for a transportable amp to pair with HRT Microstreamer to drive my HD600 & Mad Dogs. Maybe a DX50 alone would be powerful enough...
The PB2 is said to pair well with the mad dogs and it did when I was driving it via using the iphone4s as a DAP. I bought the DX50 as an upgrade DAP and use the PB2 to amp the output but after listening to the mad dogs from the DX50 alone its reaches 90% of the SQ and loudness levels of the PB2, IMO. So no real need for my PB2s now. I still might keep the PB2s because I have the HD600s coming in the mail and the DX50 may be insuffient to drive the high impedance cans