TrueScaleAudio
Compare speakers at true scale
Pick two speakers and see them side by side at their real-world size.
Front view — overlaid at true scale
Click either cabinet to swap A ↔ B · Reference height: 925 mm (92.5 cm) · 1 mm = 0.61 px
Fyne Audio F55EvsCastle Knight 4
The Fyne Audio F55E stands 92.5 cm tall — about 2.5 cm more than the Castle Knight 4 at 90.0 cm. On footprint the Fyne Audio F55E is the wider cabinet (21.0 cm versus 16.5 cm). At 90 dB against 88 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 42 Hz. The Fyne Audio F55E is down-firing ported and the Castle Knight 4 is a transmission line. Both land in a similar price bracket, around $1,082 a pair.
| A | B | |
|---|---|---|
| Manufacturer | Fyne Audio | Castle |
| Model | Fyne Audio F55E | Castle Knight 4 |
| Height | 925 mm | 900 mm |
| Width | 210 mm | 165 mm |
| Depth | 236 mm | 270 mm |
| Weight | 11.9 kg | 12.5 kg |
| Enclosure | bass-reflex-down | transmission-line |
| Drivers | 1× 19 mm tweeter (titanium dome), 1× 125 mm mid-bass (multi-fibre cone), 1× 125 mm woofer (multi-fibre cone) | 2× 130 mm mid-bass, 1× 25 mm tweeter (soft dome) |
| Frequency — low | 42 Hz | 36 Hz |
| Frequency — high | 38000 Hz | 24000 Hz |
| Sensitivity | 88 dB | 90 dB |
| Impedance | 8 Ω | 8 Ω |
| Recommended amp | 30–120 W | 25–150 W |
| MAP (USD) | $1,143 / pair | $1,020 / pair |
| Where to buy | Check availability ↗ | Check availability ↗ |
| Brand website | fyneaudio.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.