Front view — side by side at true scale
APolk Signature Elite ES50BCastle Knight 3
Click either cabinet to swap A ↔ B · Reference height: 950 mm (95.0 cm) · 1 mm = 0.59 px
| A | B | |
|---|---|---|
| Manufacturer | Polk | Castle |
| Model | Polk Signature Elite ES50 | Castle Knight 3 |
| Height | 950 mm | 820 mm |
| Width | 261 mm | 165 mm |
| Depth | 277 mm | 265 mm |
| Weight | 14.5 kg | 10.7 kg |
| Enclosure | bass-reflex-down | transmission-line |
| Drivers | 1× 25 mm tweeter (Terylene Dome), 2× 133 mm mid-bass (Dynamic Balance mica-reinforced polypropylene cone) | 1× 130 mm mid-bass, 1× 25 mm tweeter (soft dome) |
| Frequency — low | 38 Hz | 38 Hz |
| Frequency — high | 40000 Hz | 24000 Hz |
| Sensitivity | 88 dB | 88 dB |
| Impedance | 8 Ω | 8 Ω |
| Recommended amp | 40–200 W | 15–100 W |
| MAP (USD) | $700 / pair | $770 / pair |
| Where to buy | Check availability ↗ | Check availability ↗ |
| Brand website | polkaudio.com ↗ | castle.uk.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.