TrueScaleCompare speakers at true scale.
TrueSpecsCompare technical specifications (up to 4 speakers).HiFi LadderBrowse every speaker side by side, ordered by size or by price.HiFi SearchFind speakers by the specs you want.

TrueScaleAudio

Compare speakers at true scale

Pick two speakers and see them side by side at their real-world size.

Speaker A
Speaker B
OverlaySide by side
Presentation mode
References

Front view — side by side at true scale

ACastle Avon 4BQuad S-4
Castle Avon 4 front view
Quad S-4 front view

Click either cabinet to swap A ↔ B · Reference height: 37.6 in · 1 in = 14.89 px

Castle Avon 4vsQuad S-4

The Castle Avon 4 stands 95.5 cm tall — about 8.5 cm more than the Quad S-4 at 87.0 cm. At 89 dB against 88 dB, the Castle Avon 4 is the easier load to drive and plays louder from the same amplifier. The Castle Avon 4 is a transmission line and the Quad S-4 is loaded by a passive radiator.

TrueSpecs presentation

Specifications

mm / kgin / lb
AB
ManufacturerCastleQuad
ModelCastle Avon 4Quad S-4
Height37.6 in34.3 in
Width7.1 in7.1 in
Depth12.2 in11.8 in
Weight38.8 lb45.2 lb
Enclosuretransmission-linepassive-radiator
Drivers1× 5.1 in woofer, 1× 4.5 in midrange, 1× tweeter (ribbon)1× tweeter (ribbon), 1× 3.9 in midrange (woven Kevlar cone), 2× 4.9 in woofer (woven Kevlar cone)
Frequency — low45 Hz44 Hz
Frequency — high20000 Hz23000 Hz
Sensitivity89 dB88 dB
Impedance8 Ω6 Ω
Recommended amp25–100 W40–200 W
MAP (USD)—$1,499 / pair
Where to buyCheck availability ↗Check availability ↗
Brand websitecastle.uk.com ↗quad-hifi.co.uk ↗
Product pageOpen 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.