These sit in different price classes - Buchardt A500 costs roughly 1.8x what KEF LS50 Wireless does. Expect it to lead on paper; the question is whether the gap is audible enough in your room to be worth it.
| Area | Better | Why |
|---|
| Bass | A | Buchardt A500 digs deeper - 25Hz against 79Hz. |
| Built-in power | A | Buchardt A500 has the bigger amplifier (450W vs 230W RMS). |
| Connections | B | KEF LS50 Wireless adds Bluetooth, streaming and digital inputs. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Cabinet | depends | Sealed vs Ported. Sealed is tighter and happier near a wall; ported digs lower but wants space behind it. |
| Expandability | B | KEF LS50 Wireless: a sub output. KEF LS50 Wireless sits in a wider range (10 models), so a matched surround system is easier later. |
| Price | B | KEF LS50 Wireless is cheaper - $2,200 against $3,850, about 43% less; arguably a different class. |
A Buchardt A500 B KEF LS50 Wireless
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Neither runs away with it - they trade advantages. Let the "depends" rows and your own room settle it. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 79Hz anyway, which makes the cheaper KEF LS50 Wireless much easier to justify. Think about the whole system, not just the speakers: the roughly $1,650 saved by taking the cheaper pair would buy a subwoofer or a better amplifier, and either usually does more for the sound than the difference between these two.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.