I personally don't like the sound of the Bose L1s. I heard them when I was in London for the Pico meetup and I find they sound very muddy. I've been using RCF TT22-A active speakers for a year and they're jaw dropping. Everything I put through them sounds amazing: vocals, synth, electrical guitar, bass, drums. It lacks a bit below 90Hz since it had a rolloff there. I usually compensate in EQ but might eventually add a sub woofer.
On another note though, if you want a good sound, you also need a good soundcard. The one in a Mac just doesn't cut it. I'm using Metric Halo devices. I previously used an Apogee Duet, but much prefer Metric Halo now.