Mashakos has given us a nice little writeup on Zalman's headphones.

Specifications:

• Model : ZM-RSA
• Power : 6V-9V DC
• Power Consumption : 0.6W
• Dimensions :
  • - When horizontally laid down : 197(L) X 140(W) X 45(H)
  • - When placed vertically with mounts : 140(L) X 45(W) X 212(H)
• Weight : 12oz/329g (amplifier only)
• Input Characteristics : Vin -6dBV, f=1kHz
• Typical Output : 31mW at 32ohm (THD < 0.1%)
• THD : 0.02% (BW=20Hz-20kHz)
• Channel Separation : 90dB
• Output Noise Voltage : -93dBV (BW=20Hz-20kHz)
• Frequency Response : 20Hz-20kHz

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