Siblings in PSB's iQ series, so they share a family sound. It comes down to size, output and price.
| Area | Better | Why |
|---|
| Bass | evenly matched | Much the same reach (64Hz vs 64Hz). |
| Built-in power | evenly matched | Similar onboard amplification (270W vs 270W RMS). |
| Connections | evenly matched | The same set of inputs and streaming options. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Expandability | depends | PSB iQ2: a sub output; PSB iQ1: a sub output. |
| Price | B | PSB iQ1 is cheaper - $999 against $1,399, about 29% less. |
A PSB iQ2 B PSB iQ1
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?
Neither runs away with it - they trade advantages. Let the "depends" rows and your own room settle it. Think about the whole system, not just the speakers: the roughly $400 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.