If you have an amp that has speaker-level input, and you still choose to connect that amp to your speakers using line-out-converter (LOC), is it true that the LOC method would give better sound volume and quality than doing it through speaker-level input?
Foong, speaker level input and LOC work the same way. To say one is better than the other is a moot point. If you're into SQ, then use RCA. To answer your question, LOC is a bit better than speaker level input cause some LOCs come with gain control, thus lowering your chances of picking up distortion/noise.