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 |
Kanto YU digs deeper - 60Hz against 76Hz. |
| Built-in power |
A |
Kanto YU has the bigger amplifier (70W vs 50W RMS). |
| Connections |
B |
Jamo S 801 PM adds digital inputs. |
| Size |
depends |
Kanto YU is easier to place; Jamo S 801 PM is bigger, which usually goes with fuller bass. Your room decides. |
| Expandability |
depends |
Kanto YU: a sub output; Jamo S 801 PM: a sub output. Jamo S 801 PM sits in a wider range (7 models), so a matched surround system is easier later. |
| Price |
evenly matched |
Much the same money ($300 vs $300 a pair). |
A Kanto YU
B Jamo S 801 PM
depends neither is better in the abstract - it turns on your room, placement 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?
Kanto YU 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 76Hz anyway, so judge these on the other rows instead. In a large or open-plan room, Jamo S 801 PM has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Kanto YU 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.