Siblings in Klipsch's Heritage series, so they share a family sound. It comes down to size, output and price.
| Area | Better | Why |
|---|
| Bass | B | Klipsch Forte IV digs deeper - 38Hz against 48Hz. |
| Amplifier needs | evenly matched | Similar sensitivity (99dB vs 99dB) - both want much the same power. |
| Headroom | evenly matched | Similar power handling (100W vs 100W). |
| Size | depends | Klipsch Heresy IV is easier to place; Klipsch Forte IV is bigger, which usually goes with fuller bass. Your room decides. |
| Cabinet | depends | Ported vs Passive Radiator. |
| Expandability | depends | Klipsch Heresy IV: bi-amping; Klipsch Forte IV: bi-amping. |
| Price | A | Klipsch Heresy IV is cheaper - $3,198 against $4,998, about 36% less. |
A Klipsch Heresy IV B Klipsch Forte IV
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 Forte IV is ahead, but only on 1 of the measured areas, and it costs about 56% more. That is a lot of money for a narrow margin on paper - Klipsch Heresy IV looks like the sensible buy unless something else about the Klipsch Forte IV appeals to you. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 48Hz anyway, which makes the cheaper Klipsch Heresy IV much easier to justify. In a large or open-plan room, Klipsch Forte IV has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Klipsch Heresy IV 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.