Siblings in KEF's Q Meta series, so they share a family sound. It comes down to size, output and price.
| Area | Better | Why |
|---|
| Bass | A | KEF Q4 Meta digs deeper - 65Hz against 105Hz. |
| Amplifier needs | evenly matched | Similar sensitivity (86dB vs 86dB) - both want much the same power. |
| Size | depends | KEF Q8 Meta is easier to place; KEF Q4 Meta is bigger, which usually goes with fuller bass. Your room decides. |
| Cabinet | depends | Ported vs Sealed. Sealed is tighter and happier near a wall; ported digs lower but wants space behind it. |
| Price | B | KEF Q8 Meta is cheaper - $900 against $1,000, about 10% less. |
A KEF Q4 Meta B KEF Q8 Meta
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?
The usual trade-off: KEF Q4 Meta measures better, KEF Q8 Meta costs about about 11% more% less. Whether that gap is worth the money is the call only you can make - and in a normal room it is often smaller than the numbers suggest. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 105Hz anyway, which makes the cheaper KEF Q8 Meta much easier to justify. In a large or open-plan room, KEF Q4 Meta has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, KEF Q8 Meta 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.