Acoustic Energy 305 speakers vs KEF LS50: which to buy?

For most listeners I would take the KEF LS50. It edges ahead on sound quality and midrange clarity, and pulls clear on treble detail and design.

Buy the Acoustic Energy 305 if you have a real room to fill and you want low end that arrives with weight. It leads on bass response by a clear margin, and the 3-way layout, 35 Hz to 32 kHz rating and 90 dB sensitivity back that up: it plays loud on modest power and keeps the bottom octaves solid rather than boomy. It also takes value for money, though only narrowly. This is the one for rock, large-scale classical, and anyone who would rather not add a subwoofer later. Be aware that it is a 900 mm floorstander rated to 200 W, so it wants floor space and an amplifier with some headroom before it sounds its best.

The KEF LS50 is my pick if the room is small, the seat is close, and you care most about hearing into a recording. It takes sound quality and midrange clarity by narrow margins and treble detail and design by clear ones, and that combination shows up as voices and wind instruments placed in front of you with unusual precision. The trade sits at the bottom of the range: it runs out of low-end authority sooner, so budget for a subwoofer if you watch films or want physical impact. At 85 dB sensitivity and a 25 to 100 W amp window it also rewards a clean partnering amplifier, and it will expose a poor one rather than smooth it over.