LS50
Frequency response (±3dB) 79Hz - 28kHz
Sensitivity (2.83V/1m) 85dB
R100
Frequency response (±3dB) 56Hz - 28kHz
Sensitivity (2.83V/1m) 86dB
For that kind of money, I would be looking at other speakers, both are hard to drive, both have limited low frequency response, unless you have a small room and your listening taste is somewhat limited to female vocals and such then these may work. I had my share of small bookshelf speakers, (AE,, Celestion) they were ok at the start but eventually their small size starts to show once you start playing music that that demand IMPACT at the lower registers EVEN at lower volumes...