The M2Tech HiFace is a very good converter. In my system, using it with a Mac Mini/Pure Music into a Modwright Transporter (as a DAC), the resulting sound is as high fidelity as my Esoteric UX-3Pi.
That yours sounds "am radio like" indicates a possible problem either with set-up (the most likely cause, IMO) or a faulty HiFace.
A couple things to check:
1) Apple Midi configured with HiFace as the output device, and at the highest sampling rate supported by your DAC, and no higher.
2) Sampling rate configured for the HiFace in Pure Music set to the correct sampling rate for your DAC.
There are quite a few settings to get correct in Pure Music to get it performing optimally. It wasn't all readily apparent to me without carefully studying the PM user manual and reading a few threads about Pure Music.
That yours sounds "am radio like" indicates a possible problem either with set-up (the most likely cause, IMO) or a faulty HiFace.
A couple things to check:
1) Apple Midi configured with HiFace as the output device, and at the highest sampling rate supported by your DAC, and no higher.
2) Sampling rate configured for the HiFace in Pure Music set to the correct sampling rate for your DAC.
There are quite a few settings to get correct in Pure Music to get it performing optimally. It wasn't all readily apparent to me without carefully studying the PM user manual and reading a few threads about Pure Music.

