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Front view — side by side at true scale
ACastle Avon 5BTriangle BR09
Castle Avon 5vsTriangle BR09
The Castle Avon 5 stands 111.0 cm tall — about 1.5 cm more than the Triangle BR09 at 109.5 cm. On footprint the Triangle BR09 is the wider cabinet (25.4 cm versus 21.0 cm). At 92 dB against 89 dB, the Triangle BR09 is the easier load to drive and plays louder from the same amplifier. Low frequencies come from a 150 mm cone on the Castle Avon 5 and a 160 mm cone on the Triangle BR09.
| A | B | |
|---|---|---|
| Manufacturer | Castle | Triangle |
| Model | Castle Avon 5 | Triangle BR09 |
| Height | 43.7 in | 43.1 in |
| Width | 8.3 in | 10 in |
| Depth | 14.4 in | 12.4 in |
| Weight | 52.9 lb | 51.6 lb |
| Enclosure | transmission-line | bass-reflex-front |
| Drivers | 2× 5.9 in woofer, 1× 4.5 in midrange, 1× tweeter (ribbon) | 1× 1 in tweeter (silk-dome), 1× 6.3 in midrange (natural cellulose-pulp cone), 3× 6.3 in woofer (fiberglass cone) |
| Frequency — low | 35 Hz | 35 Hz |
| Frequency — high | 20000 Hz | 22000 Hz |
| Sensitivity | 89 dB | 92 dB |
| Impedance | 8 Ω | 8 Ω |
| Recommended amp | 25–100 W | 60–300 W |
| MAP (USD) | — | $1,449 / pair |
| Where to buy | Check availability ↗ | Check availability ↗ |
| Brand website | castle.uk.com ↗ | trianglehifi.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.

