now i wonder if the dsp work is done digitally? and is it digitally controlled analog volume, or if the dsp work is digital is it actual digital volume control. If its done digital there would be no reason for the analog inputs, because even if you had the best dac available it would be going through a ADC->DAC again anyways.
We need more info's jude
also more info on the amp, besides just battery life, i wondering about topology. With 6 amp channels in that tiny little thing, does that mean there are 4 cables going to each earpiece? and since its 6 channels, that means it must be opamp driven, which ones does it use?
DSP (Digital Signal Processing) has to be done digitally... I think your point about this ideally being fed SPDIF is thus valid but It depends of course on the quality of the built-in DAC. ADC>DAC is not necessarilly a deal breaker if well implemented.
I was definitely not asking about batter life (except that if it has 500 hours of battery life, I'm not buying it). User replacable 9V battery would be very nice.