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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

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: 37.4 in · 1 in = 14.97 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
Height32.3 in37.4 in
Width6.5 in10.3 in
Depth10.4 in10.9 in
Weight23.6 lb32 lb
Enclosuretransmission-linebass-reflex-down
Drivers1× 5.1 in mid-bass, 1× 1 in tweeter (soft dome)1× 1 in tweeter (Terylene Dome), 2× 5.2 in 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.