TrueScaleAudio
Compare speakers at true scale
Pick two speakers and see them side by side at their real-world size.
Front view — side by side at true scale
Click either cabinet to swap A ↔ B · Reference height: 12.8 in · 1 in = 43.90 px
Castle Richmond IVvsPolk Reserve R100
The Polk Reserve R100 stands 32.4 cm tall — about 1.9 cm more than the Castle Richmond IV at 30.5 cm. On footprint the Castle Richmond IV is the wider cabinet (19.0 cm versus 16.7 cm). At 87 dB against 86 dB, the Castle Richmond IV is the easier load to drive and plays louder from the same amplifier. Low frequencies come from a 150 mm cone on the Castle Richmond IV and a 133 mm cone on the Polk Reserve R100. Both land in a similar price bracket, around $730 a pair.
| A | B | |
|---|---|---|
| Manufacturer | Castle | Polk |
| Model | Castle Richmond IV | Polk Reserve R100 |
| Height | 12 in | 12.8 in |
| Width | 7.5 in | 6.6 in |
| Depth | 10.3 in | 10.2 in |
| Weight | 13.9 lb | 12.1 lb |
| Enclosure | bass-reflex-rear | bass-reflex-rear |
| Drivers | 1× 5.9 in mid-bass, 1× 1.3 in tweeter (soft dome) | 1× 1 in tweeter (Pinnacle ring radiator), 1× 5.2 in mid-bass (Turbine cone) |
| Frequency — low | 58 Hz | 58 Hz |
| Frequency — high | 22000 Hz | 39000 Hz |
| Sensitivity | 87 dB | 86 dB |
| Impedance | 8 Ω | 4 Ω |
| Recommended amp | 25–100 W | 30–150 W |
| MAP (USD) | $760 / pair | $699 / pair |
| Where to buy | Check availability ↗ | Check availability ↗ |
| Brand website | castle.uk.com ↗ | polkaudio.com ↗ |
| Product page | Open product page ↗ | Open product page ↗ |
Larger value highlighted in green. For low-frequency extension, lower Hz = greater bass reach, so the deeper side is highlighted.