there will be no problem with an mqa-able dac playing non-mqa music
an mqa capable dac simply has the ability to sense a digital fed signal with mqa encoding, in which case it will do some additional processing to take advantage of mqa ... if no mqa signal, it will play the music normally
an mqa capable dac simply has the ability to sense a digital fed signal with mqa encoding, in which case it will do some additional processing to take advantage of mqa ... if no mqa signal, it will play the music normally