1.http://www.head-fi.org/t/672419/review-hifi-et-ma8-dap
2.http://www.erji.net/read.php?tid=1490525
3.http://www.erji.net/read.php?tid=1498621&keyword=%D0%A1%BA%FA%D7%D3
4.http://www.inearspace.co.uk/inearspace/HiFi_ET_MA8.html