Siblings in Paradigm's Premier series, so they share a family sound. It comes down to size, output and price.
| Area | Better | Why |
|---|
| Bass | A | Paradigm Premier 620C v2 digs deeper - 49Hz against 68Hz. |
| Amplifier needs | A | Paradigm Premier 620C v2 is more sensitive (93dB vs 90dB), so it goes louder on the same amplifier. |
| Size | depends | Paradigm 100B is easier to place; Paradigm Premier 620C v2 is bigger, which usually goes with fuller bass. Your room decides. |
| Type | depends | A Passive Center Channel against a Passive Bookshelf - a different job rather than a better one. |
| Cabinet | depends | Passive Radiator vs Ported. |
| Price | B | Paradigm 100B is cheaper - $800 against $1,300, about 38% less; arguably a different class. |
A Paradigm Premier 620C v2 B Paradigm 100B
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: Paradigm Premier 620C v2 measures better, Paradigm 100B costs about about 63% 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 68Hz anyway, which makes the cheaper Paradigm 100B much easier to justify. In a large or open-plan room, Paradigm Premier 620C v2 has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Paradigm 100B 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.