These sit in different price classes - Klipsch The Nines II costs roughly 1.6x what Klipsch The Nines does. Expect it to lead on paper; the question is whether the gap is audible enough in your room to be worth it.
| Area | Better | Why |
|---|
| Bass | B | Klipsch The Nines II digs deeper - 31Hz against 34Hz. A subwoofer would even that out. |
| Connections | evenly matched | The same set of inputs and streaming options. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Expandability | depends | Klipsch The Nines: a sub output; Klipsch The Nines II: a sub output. |
| Price | A | Klipsch The Nines is cheaper - $1,499 against $2,399, about 38% less; arguably a different class. |
A Klipsch The Nines B Klipsch The Nines 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?
Klipsch The Nines II is ahead, but only on 1 of the measured areas, and it costs about 60% more. That is a lot of money for a narrow margin on paper - Klipsch The Nines looks like the sensible buy unless something else about the Klipsch The Nines II appeals to you. Think about the whole system, not just the speakers: the roughly $900 saved by taking the cheaper pair would buy a subwoofer or a better amplifier, and either usually does more for the sound than the difference between these two.
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.