I decided to get the Beyerdynamics DT880 but don't know which version (250ohm or 600ohm) is best for my DAC/amp. I have the Peachtree Nova. Specifications for the headphone amp section (from Peachtree's website):
Headphone Amp (shared with the Pre-Out stage)
Suitable for all electro-dynamic headphones
Frequency response: DC ~ 100 kHz +/- 0.1dB
Voltage gain: 10dB
Maximum output voltage: 7Vrms
output impedance: <30ohms
Maximum output power: 100mW into 8Ohm / 300mW into 150Ohm / 150mW into 300Ohm
Class A output stage
6922 Tube is in circuit


















