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References
Front view — overlaid at true scale
ACastle Knight 2BELAC Debut DB63
Castle Knight 2vsELAC Debut DB63
The Castle Knight 2 stands 38.0 cm tall — about 4.1 cm more than the ELAC Debut DB63 at 33.9 cm. At 90 dB against 87 dB, the Castle Knight 2 is the easier load to drive and plays louder from the same amplifier. Low frequencies come from a 150 mm cone on the Castle Knight 2 and a 165 mm cone on the ELAC Debut DB63. Both land in a similar price bracket, around $480 a pair.
| A | B | |
|---|---|---|
| Manufacturer | Castle | ELAC |
| Model | Castle Knight 2 | ELAC Debut DB63 3.0 |
| Height | 380 mm | 339 mm |
| Width | 200 mm | 198 mm |
| Depth | 335 mm | 298 mm |
| Weight | 7.85 kg | 7.85 kg |
| Enclosure | bass-reflex-rear | bass-reflex-rear |
| Drivers | 1× 150 mm mid-bass, 1× 25 mm tweeter (soft dome) | 1× 25 mm tweeter (aluminium dome), 1× 165 mm mid-bass (aramid-fibre cone) |
| Frequency — low | 42 Hz | 42 Hz |
| Frequency — high | 24000 Hz | 38000 Hz |
| Sensitivity | 90 dB | 87 dB |
| Impedance | 8 Ω | 6 Ω |
| Recommended amp | 15–125 W | 20–140 W |
| MAP (USD) | $510 / pair | $450 / pair |
| Where to buy | Check availability ↗ | Check availability ↗ |
| Brand website | castle.uk.com ↗ | elac.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.

