I have had these beauties for a few years now and I have upgraded so looking at selling my KEF X300A Wireless speakers. They are great bookshelf speakers. They have Twin Class AB amps built in. I have had no issues with the speakers other than the power output getting fused but that's due to wear and tear. Fixed it by a KEF warranted repairer Elsey Electronics about a couple of months back. Have the receipt for that. There are no issues with the speaker and they work great. Excellent clarity. Might lack punch because of their size but clarity wise they are excellent and great detail. There are some physical blemishes here and there on the speaker but nothing major that takes away from their beautiful design. I have attached photos of the speakers with the stands. These are UniQ drivers which is world renowned. Specs: Powered speakers with active crossovers 4.7 litre volume 130 mm Uni-Q magnesium/aluminium mid-bass drivers with 25 mm concentric aluminium dome tweeters 24-bit/96 kHz USB DAC 2x 20 W (HF) and 2x 50 W (LF) Class AB amplifiers 49 Hz–45 kHz (–6dB) specified frequency response balance and gain controls 15 W consumption per speaker 280 x 180 x 215 mm (without rear heatsink, 243 mm deep with) 7.5 kg each

Full specs and review of the speakers: https://www.techadvisor.com/review/kef-x300a-wireless-review-3598992/