I bought these a few weeks ago. I used RCA ports to connect a bluetooth receiver, so I can stream from my phone during office hours. They perform very well. Bi-amped speakers have all the power they need to produce low distortion sound at all volume levels. They play a across a very broad spectrum and all types of music sound great. These are ported, so the low end comes through even at low volume levels. I rated 4 instead of 5 as they lack ( just a little) punch at the low end. It is probably asking too much from such a small package. My preference is for the bass to be impactful even at low volume. Don't be confused by this though, they produce a very rich sound from a decent mp3 file. Great value.