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Double amping sucks, but I guess if the second amp is ultra-low distortion, it sucks less?
Traditional amplifier designs in series does amplify a lot of distortion. THX AAA tech is pretty remarkable for its ability to null distortion, and the DB12 AAAMP was designed to power juice-hungry headphones (like planar magnetic designs) for use from a smartphone since most phones can't supply enough power for applications like that.
do you mean to say thx aaa will nullify the distortion from my phone's dac?
THX AAA does an amazing job with really clean amplification. It definitely nulls distortion that traditional amplification generates in its internal signal path, and AAA delivers a lot of signal. Because it allows your phone's amp to work in an output range where it's more efficient, the amp distortion is much less prevalent. DAC distortion is another issue. I'll check w/ THX to see if AAA has a tangential benefit on signal distortion on the input, but my guess is that AAA can't work like a "distortion filter" on a scale where it could work miracles w/ an iPhone 3GS.