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Front view — side by side at true scale
AJamo C605 MKIIBCastle Knight 4
Jamo C605 MKIIvsCastle Knight 4
The Castle Knight 4 stands 90.0 cm tall — about 3.8 cm more than the Jamo C605 MKII at 86.2 cm. On footprint the Jamo C605 MKII is the wider cabinet (20.8 cm versus 16.5 cm). At 90 dB against 89 dB, the Castle Knight 4 is the easier load to drive and plays louder from the same amplifier. The Castle Knight 4 reaches deeper in the bass, down to 36 Hz versus 45 Hz. Both land in a similar price bracket, around $1,010 a pair.
| A | B | |
|---|---|---|
| Manufacturer | Jamo | Castle |
| Model | Jamo C605 MKII MKII | Castle Knight 4 |
| Height | 862 mm | 900 mm |
| Width | 208 mm | 165 mm |
| Depth | 341 mm | 270 mm |
| Weight | 17.5 kg | 12.5 kg |
| Enclosure | bass-reflex | transmission-line |
| Drivers | 1× 25.4 mm tweeter (positive soft dome), 1× 135 mm midrange (Hybrid Composition Conical Cone (HCCC)), 1× 135 mm woofer (Hybrid Composition Conical Cone (HCCC)) | 2× 130 mm mid-bass, 1× 25 mm tweeter (soft dome) |
| Frequency — low | 45 Hz | 36 Hz |
| Frequency — high | 20000 Hz | 24000 Hz |
| Sensitivity | 89 dB | 90 dB |
| Impedance | 6 Ω | 8 Ω |
| Recommended amp | 140 W | 25–150 W |
| MAP (USD) | $999 / pair | $1,020 / pair |
| Where to buy | Check availability ↗ | Check availability ↗ |
| Brand website | jamo.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.

