(I'm really new to this stuff).
Recently when browsing a few hi-fi websites I noticed that they sold headphone amps. After reading into it a bit more I noticed that many came with DACs and are particularly good at upgrading the sound quality from computers.
I have an iMac (with uncompressed CD-quality audio files) and a pair of Klipsch x10s (in-ear earphones). I'm looking at something to improve the sound quality and to also be able to output to a hi-fi too (without the need to change outputs every time). The sound quality to the hi-fi needn't be that good (as it will mainly be used to let people hear sample tracks and the radio from the internet), the main listening will be done through earphones (so good quality essential there).
Will the DAC/headphone amp make much difference to such small earphones (are they really there to boost over-ear headphones)? And is it unreasonable to expect anything to be able output to two devices without pulling one connection out?
I've been looking at the Fiio E7 (with two headphone output jacks) and the Arcam rPac (with headphone output jack and phono output). Naturally they will connect to the mac via USB (unless Firewire or Thunderbolt are usable).