Front view — side by side at true scale
ACastle Knight 3BPolk Signature Elite ES50
Click either cabinet to swap A ↔ B · Reference height: 950 mm (95.0 cm) · 1 mm = 0.59 px
| A | B | |
|---|---|---|
| Manufacturer | Castle | Polk |
| Model | Castle Knight 3 | Polk Signature Elite ES50 |
| Height | 820 mm | 950 mm |
| Width | 165 mm | 261 mm |
| Depth | 265 mm | 277 mm |
| Weight | 10.7 kg | 14.5 kg |
| Enclosure | transmission-line | bass-reflex-down |
| Drivers | 1× 130 mm mid-bass, 1× 25 mm tweeter (soft dome) | 1× 25 mm tweeter (Terylene Dome), 2× 133 mm mid-bass (Dynamic Balance mica-reinforced polypropylene cone) |
| Frequency — low | 38 Hz | 38 Hz |
| Frequency — high | 24000 Hz | 40000 Hz |
| Sensitivity | 88 dB | 88 dB |
| Impedance | 8 Ω | 8 Ω |
| Recommended amp | 15–100 W | 40–200 W |
| MAP (USD) | $770 / pair | $700 / 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.