A generation apart: Klipsch R-15PM is the newer design, against a 2011 model. Newer is not automatically better, but the older one is more likely to be discounted or near run-out.
| Area | Better | Why |
|---|
| Bass | B | Audioengine A5+ digs deeper - 50Hz against 62Hz. |
| Built-in power | A | Klipsch R-15PM has the bigger amplifier (100W vs 50W RMS). |
| Connections | A | Klipsch R-15PM adds Bluetooth, phono and digital inputs. |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Expandability | depends | Klipsch R-15PM: a sub output; Audioengine A5+: a sub output. |
| Price | B | Audioengine A5+ is cheaper - $399 against $499, about 20% less. |
A Klipsch R-15PM B Audioengine A5+
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: Klipsch R-15PM measures better, Audioengine A5+ costs about about 25% 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 62Hz anyway, so judge these on the other rows instead.
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.