Klipsch RP-504C II vs Polk Reserve R400
The Klipsch RP-504C II is more sensitive (96 dB vs 89 dB), so it plays louder per watt. The Polk Reserve R400 plays lower (48 Hz vs 50 Hz) and costs less ($699 vs $750).
What each one works with
Checked against every product in our catalogue by the same engine as the compatibility checker.
| RP-504C II | Reserve R400 | |
|---|---|---|
| Receivers and amps that drive it | 29 of 29 | 29 of 29 |
Specs side by side
Values that differ are bold. A dash means that model doesn't publish the spec.
| RP-504C II | Reserve R400 | |
|---|---|---|
| Impedance | 8 Ω | 8 Ω |
| Sensitivity | 96 dB (2.83 V, 1 m) in-room | 89 dB (2.83 V, 1 m) |
| Low end | 50 Hz | 48 Hz |
| Drivers | 1 × 25 mm, 4 × 133 mm | 1 × 25 mm, 2 × 165 mm |
| Size | 32×7×15 in | 24×8×14 in |
| Weight | 16.45 kg (36.3 lb) | 14.9 kg (32.8 lb) |
| MSRP | $750 each (MSRP, September 2026) | $699 each (MSRP, September 2026) |
| Recommended amplifier power | — | 40–200 W |
Every spec and pairing: Klipsch RP-504C II, Polk Reserve R400.
Try either one in your own room.
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References
- Klipsch RP-504C II: Spec sheet, assets.klipsch.com, retrieved September 15, 2026
- Klipsch RP-504C II: Retailer listing, abt.com, retrieved September 15, 2026
- Polk Reserve R400: Spec sheet, polkaudio.com, retrieved September 15, 2026
- Polk Reserve R400: Owner's manual, polkaudio.com, retrieved September 15, 2026
- Polk Reserve R400: Manufacturer product page, polkaudio.com, retrieved September 15, 2026
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