อันนี้ยกมาจาก http://www.headfonia.com/possibly-the-best-the-627/ The sound quality of the Glacier is very solid and definitely among the best sounding portable amps out there. Single ended, and talking purely on sound quality and ignoring power output (though the Glacier is actually quite powerful), I would immediately rank it as better than the Rx Mk3B’s sound quality (ignoring the balanced features on the Mk3B). The Glacier is very spacious and the detail retrieval is amazing, and the closest to the 627 among all the other amps I compared here. The sound is forward and lively, similar to how the Continental and RX Mk3B are which is quite a contrast from the mellower 627.