De High Performance PC Guide heeft een review van de Diamond MX300 bij elkaar weten te knutselen. Ze hebben vooral naar de technische kant gekeken (frequency spectrum analysis) en ze komen tot een aantal opmerkelijke conclusies.
Hier een stukkie over de MIDI kwaliteit van de MX300:
The listening test of this soundcard has revealed a very pleasant soundcard but without any great surprises. All the instruments have a very good sound quality but not more. The listening of MiDi files is very pleasant and very interesting, the video games sound reproduction is accurate and reproachless and the WAVE files playback is excellent and of a very good quality. However, with a great astonishment, we noticed the presence of residual noises when listening to MiDi files. Even if these noises are very weak we were very surprised of them and we were seriously wondering where the could come from. These noises, mostly audible on solo instruments playing short notes, sounded like cracking sounds. We couldn't tell for sure if these noises were coming from the files themselves or were computing noises generated by the card itself. There was some music files were there was no noises but we don't remember their presence on any other soundcard we've tested before as we always use the same MiDi music files for each card we test.