The PK 1s defnitely need an amp. Don't know about the PK 2s, but if you compare their impedance and sensitivity you can get idea about if they need an amp. Based on your choices the ES 7s would be good. The Sony V6's are not bad headphones, but you won't go wrong with ES 7s.
post #16 of 25
12/9/09 at 1:34am










