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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

APolk Signature Elite ES50BCastle Knight 3
Polk Signature Elite ES50 front view
Castle Knight 3 front view

Click either cabinet to swap A ↔ B · Reference height: 950 mm (95.0 cm) · 1 mm = 0.59 px

Polk Signature Elite ES50vsCastle Knight 3

The Polk Signature Elite ES50 stands 95.0 cm tall — about 13.0 cm more than the Castle Knight 3 at 82.0 cm. On footprint the Polk Signature Elite ES50 is the wider cabinet (26.1 cm versus 16.5 cm). The Polk Signature Elite ES50 is down-firing ported and the Castle Knight 3 is a transmission line. Both land in a similar price bracket, around $735 a pair.

TrueSpecs presentation

Specifications

mm / kgin / lb
AB
ManufacturerPolkCastle
ModelPolk Signature Elite ES50Castle Knight 3
Height950 mm820 mm
Width261 mm165 mm
Depth277 mm265 mm
Weight14.5 kg10.7 kg
Enclosurebass-reflex-downtransmission-line
Drivers1× 25 mm tweeter (Terylene Dome), 2× 133 mm mid-bass (Dynamic Balance mica-reinforced polypropylene cone)1× 130 mm mid-bass, 1× 25 mm tweeter (soft dome)
Frequency — low38 Hz38 Hz
Frequency — high40000 Hz24000 Hz
Sensitivity88 dB88 dB
Impedance8 Ω8 Ω
Recommended amp40–200 W15–100 W
MAP (USD)$700 / pair$770 / pair
Where to buyCheck availability ↗Check availability ↗
Brand websitepolkaudio.com ↗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.