I apologize in advance for the long-winded post. The short version is that I'm looking for a battery powered headphone amp. Not a DAC/AMP, just the amp. Line in, headphone out. Ideally it should be as transparent as possible, adding no coloration of its own to the sound.
The longer version:
I'm a field recordist. I make a habit of hauling a bag full of sound gear way out in the middle of nowhere to record... the middle of nowhere. Consumer level portable recorders have come a long way in the last decade, offering P48 power, gobs of clean gain, lots of bit depth, and wonderful sampling rates. The one area they tend to lack is their headphone amps.
Two ways to fix this: Option one is to switch to a pro level recorder from a company like Sound Devices or Zaxcom. Only problem? The cost is about $1k per channel and I routinely use four channels. Option two is to use the line out jack on my existing recorder and feed it into a dedicated headphone amp. Hence the question.
I see lots of DAC/AMP combos here on Massdrop, but I really don't need the DAC to make this work. Any recommendations for a battery powered headphone amp I could squeeze in my bag next to my recorder?