TrueScaleAudio
Compare speakers at true scale
Pick two speakers and see them side by side at their real-world size.
Front view — side by side at true scale
Click either cabinet to swap A ↔ B · Reference height: 18.5 in · 1 in = 30.26 px
Castle Windsor DukevsHarbeth Monitor 30.3 XD2
The Castle Windsor Duke stands 47.0 cm tall — about 1.0 cm more than the Harbeth Monitor 30.3 XD2 at 46.0 cm. At 90 dB against 85 dB, the Castle Windsor Duke is the easier load to drive and plays louder from the same amplifier. The Harbeth Monitor 30.3 XD2 reaches deeper in the bass, down to 50 Hz versus 52 Hz. The Castle Windsor Duke is rear-ported and the Harbeth Monitor 30.3 XD2 is a sealed cabinet. Both land in a similar price bracket, around $6,025 a pair.
| A | B | |
|---|---|---|
| Manufacturer | Castle | Harbeth |
| Model | Castle Windsor Duke | Harbeth Monitor 30.3 XD2 |
| Height | 18.5 in | 18.1 in |
| Width | 11 in | 10.9 in |
| Depth | 13.6 in | 10.8 in |
| Weight | 29.8 lb | 25.6 lb |
| Enclosure | bass-reflex-rear | sealed |
| Drivers | 1× 7.9 in mid-bass (woven polypropylene), 1× 1.1 in tweeter (micro-fibre dome) | 1× 1 in tweeter (ferrofluid-cooled dome), 1× 7.9 in mid-bass (RADIAL polymer cone) |
| Frequency — low | 52 Hz | 50 Hz |
| Frequency — high | 22000 Hz | 20000 Hz |
| Sensitivity | 90 dB | 85 dB |
| Impedance | 8 Ω | 6 Ω |
| Recommended amp | 30–150 W | — |
| MAP (USD) | $5,760 / pair | $6,290 / pair |
| Where to buy | Check availability ↗ | Check availability ↗ |
| Brand website | castle.uk.com ↗ | harbeth.co.uk ↗ |
| 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.