A generation apart: Klipsch The Nines is the newer design, against a 2016 model. Newer is not automatically better, but the older one is more likely to be discounted or near run-out.
| Area | Better | Why |
|---|
| Bass | A | Klipsch The Nines digs deeper - 34Hz against 79Hz. |
| Built-in power | evenly matched | Similar onboard amplification (240W vs 230W RMS). |
| Connections | depends | Klipsch The Nines adds HDMI and phono; KEF LS50 Wireless adds Wi-Fi and streaming. |
| Size | depends | KEF LS50 Wireless is easier to place; Klipsch The Nines is bigger, which usually goes with fuller bass. Your room decides. |
| Expandability | depends | Klipsch The Nines: a sub output; 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 | A | Klipsch The Nines is cheaper - $1,499 against $2,200, about 32% less. |
A Klipsch The Nines 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?
Klipsch The Nines has the edge on paper, though the margin is not large. The rows marked "depends" may matter more to you than the score does. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 79Hz anyway, so judge these on the other rows instead. In a large or open-plan room, Klipsch The Nines has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, KEF LS50 Wireless is the easier speaker to get right.
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.