Each channel has its own discrete low noise voltage regulator with a common PI filtered raw DC supply.
This pre-amplifier is capable of up to 5 watts RMS output into 8 ohms, so it is capable of driving with ease 4 x sets of 32 ohm headphone on each channel continuously. 

The pre-amp comes with 2 x headphone outlets on the back, which can be expanded to 4 x outlets if so desired.
So it not only a high end line level pre-amp, it can be the bases for a very high quality multi outlet headphone amplifier.

The current version can be supplied with either dual 48 stepped attenuator volume controls or a single 48 stepped stereo attenuator.

Specifications

THD +Noise 1khz Full Global Feedback at 0dB output 1.88 Volts RMS
0.0005% THD +Noise driving a 2.2k Ohm load
0.00055% THD +Noise @ 10khz
0.001% THD +Noise @ 20khz

SNR -120dB at +6db output Unweighted

Frequency Response 5hz - 500khz -1dB