A DAC for my father's Audioengine 5+:
Cambridge Audio Azur DacMagic 100 - Black
http://www.amazon.com/gp/product/B0078Q35PG?psc=1&redirect=true&ref_=ox_sc_act_title_1&smid=A1SX1R00E2EUMR
I suggested the speaker for him, then he told me the bass is not satisfying.
I'm visiting him in South Korea on 26th, so I thought I would get a DAC for him in hopes for solving the issue.
I was originally looking between Schiit and Audioengine, but this wolfson DAC would make him happier no doubt. JUST found the shipping fee to canada is crazy, any high quality DAC would do if it's against the rules or can't be shipped.
SCHIIT DAC:
http://www.amazon.ca/Modi-USB-Digital-Analog-Convertor/dp/B00CICPN0K/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1449686608&sr=1-1
AUDIOENGINE DAC:
http://www.amazon.ca/Audioengine-D1-24-Bit-Computer-Interface/dp/B006IPH5H2/ref=sr_1_cc_3?s=aps&ie=UTF8&qid=1449686658&sr=1-3-catcorr&keywords=audio+dac