Siblings in Revel's Architectural series, so they share a family sound. It comes down to size, output and price.
| Area | Better | Why |
|---|
| Amplifier needs | B | Revel W783 is more sensitive (89dB vs 86dB), so it goes louder on the same amplifier. |
| Headroom | evenly matched | Similar power handling (150W vs 150W). |
| Size | depends | Similar cabinet size - neither is easier to fit. |
| Price | A | Revel W873 is cheaper - $900 against $1,450, about 38% less; arguably a different class. |
A Revel W873 B Revel W783
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?
Revel W783 is ahead, but only on 1 of the measured areas, and it costs about 61% more. That is a lot of money for a narrow margin on paper - Revel W873 looks like the sensible buy unless something else about the Revel W783 appeals to you. If your amplifier is modest, vintage or valve-based, Revel W783 is the safer partner - the other will want more current or more watts to sound its best. Think about the whole system, not just the speakers: the roughly $550 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.