KEF LS50
True sensitivity: 83-84 dB. Min impedance < 4 Ohms.
=> they need an amplifier with a lot of watts at 4 Ohms. KEF LS50 active, woofer with class D of 200 watts and tweeter with class AB of 30 watts.
To listen to movies, TV... a cheap class D is OK but with watts. Measured at 0.1%-1% and not at 10%.
Many buy those loudspeakers but pair them with underpowered amps -> they sound bad (bright) and put them up for sale, the LS50's. It is what impulsive buying has without being well informed before.