I'm thinking about getting the WA2 for use as my headphone amp and my preamp. Does anyone know how it compares to the WA6 as a head amp? I see that the specs are different, but I have no idea what the implications are. It looks like the WA2 has better frequency response (although I think they both extend beyond the 'phones capabilities, not to mention my ears), but I'm not sure what difference the ohms make. I'll be using them with my AKG k701s. Any input on how it might be as a preamp is welcome as well (in addition to any "must-do" upgrades) would be very much appreciated. Thanks.
Headphones impedance : 8-600 Ohms
Input impedance: 100 Kilo-Ohms
Frequency response: 20 Hz - 30 KHz, -3dB
Signal/Noise: 93 dB
THD: <= 0.3%
Voltage: AC 110/220 V, 50/60 Hz
External dimension: 6"(H), 5