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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
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Presentation mode
References

Front view — overlaid at true scale

ACastle Knight 3BPolk Signature Elite ES50
Castle Knight 3 front view
Polk Signature Elite ES50 front view

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

Castle Knight 3vsPolk Signature Elite ES50

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 Castle Knight 3 is a transmission line and the Polk Signature Elite ES50 is down-firing ported. Both land in a similar price bracket, around $735 a pair.

TrueSpecs presentation

Specifications

mm / kgin / lb
AB
ManufacturerCastlePolk
ModelCastle Knight 3Polk Signature Elite ES50
Height820 mm950 mm
Width165 mm261 mm
Depth265 mm277 mm
Weight10.7 kg14.5 kg
Enclosuretransmission-linebass-reflex-down
Drivers1× 130 mm mid-bass, 1× 25 mm tweeter (soft dome)1× 25 mm tweeter (Terylene Dome), 2× 133 mm mid-bass (Dynamic Balance mica-reinforced polypropylene cone)
Frequency — low38 Hz38 Hz
Frequency — high24000 Hz40000 Hz
Sensitivity88 dB88 dB
Impedance8 Ω8 Ω
Recommended amp15–100 W40–200 W
MAP (USD)$770 / pair$700 / pair
Where to buyCheck availability ↗Check availability ↗
Brand websitecastle.uk.com ↗polkaudio.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.