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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: 37.4 in · 1 in = 14.97 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
Height37.4 in32.3 in
Width10.3 in6.5 in
Depth10.9 in10.4 in
Weight32 lb23.6 lb
Enclosurebass-reflex-downtransmission-line
Drivers1× 1 in tweeter (Terylene Dome), 2× 5.2 in mid-bass (Dynamic Balance mica-reinforced polypropylene cone)1× 5.1 in mid-bass, 1× 1 in 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.