No single best speaker here - they are built to different priorities, and the right one depends on your room, your sources and what you listen to.
| Area | Better | Why |
|---|
| Bass | A | Fyne Audio Cubitt 5 digs deeper - 43Hz against 54Hz. |
| Connections | B | KEF LSX II adds Bluetooth, Wi-Fi, streaming, HDMI and digital inputs. |
| Size | depends | KEF LSX II is easier to place; Fyne Audio Cubitt 5 is bigger, which usually goes with fuller bass. Your room decides. |
| Expandability | B | KEF LSX II: a sub output. |
| Price | A | Fyne Audio Cubitt 5 is cheaper - $899 against $1,299, about 31% less. |
A Fyne Audio Cubitt 5 B KEF LSX II
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?
KEF LSX II is ahead, but only on 1 of the measured areas, and it costs about 44% more. That is a lot of money for a narrow margin on paper - Fyne Audio Cubitt 5 looks like the sensible buy unless something else about the KEF LSX II appeals to you. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 54Hz anyway, so judge these on the other rows instead. Match it to your room: we rate Fyne Audio Cubitt 5 the better fit for near-field listening and a small room, and KEF LSX II for a mid-size room and a large room.
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.