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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

AQuad S-4BCastle Avon 4
Quad S-4 front view
Castle Avon 4 front view

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

Quad S-4vsCastle Avon 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 Quad S-4 is loaded by a passive radiator and the Castle Avon 4 is a transmission line.

TrueSpecs presentation

Specifications

mm / kgin / lb
AB
ManufacturerQuadCastle
ModelQuad S-4Castle Avon 4
Height34.3 in37.6 in
Width7.1 in7.1 in
Depth11.8 in12.2 in
Weight45.2 lb38.8 lb
Enclosurepassive-radiatortransmission-line
Drivers1× tweeter (ribbon), 1× 3.9 in midrange (woven Kevlar cone), 2× 4.9 in woofer (woven Kevlar cone)1× 5.1 in woofer, 1× 4.5 in midrange, 1× tweeter (ribbon)
Frequency — low44 Hz45 Hz
Frequency — high23000 Hz20000 Hz
Sensitivity88 dB89 dB
Impedance6 Ω8 Ω
Recommended amp40–200 W25–100 W
MAP (USD)$1,499 / pair—
Where to buyCheck availability ↗Check availability ↗
Brand websitequad-hifi.co.uk ↗castle.uk.com ↗
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.