Hi Kamal, one more tip for you. Kef speakers are normaly tested and developed using Hegel amps. Smaller speaker like LS50 will work well with some of their small integrated, like Hegel H90, H95 when your budget will allowe this invest. But Hegel has inside also good Dac and streamer. So you may reduce ammount of boxes. And once more regarding power, it is not important "how many watts amp has" but what is the quality of this power. So good quality integrated in range 2x50 watt to 2x100 watt with high quality power supply inside is fully ok for speakers like Kef LS50. On the other hand LS50 has very detailed and clear midrange and upper bass. It means the amp must be very good in those areas. Like amps already mentioned. And do not forget pls. some very good signal source. BR.