Sine Design

Dayton Audio RS225-4

woofer · EBP 63 → suits either box · nominal (full) — Dayton Audio spec sheet (manufacturer)

Thiele/Small parameters

Fs (resonance)33 Hz
Qts0.41
Qes / Qms0.52 / 2.02
Vas46.4 L
Re / nominal Z3.2 Ω / 4 Ω
Xmax6.0 mm
Sensitivity86.9 dB (1 W/1 m, calc); 91 dB (2.83 V/1 m, mfr)
Power handling80 W

Published (nominal) values, params full — verify by measurement (DATS/REW) before building. datasheet

Recommended enclosures

Sealed (Qtc 0.707) — Vb23.5 L
Sealed — Fc / F356.9 / 56.9 Hz
Ported (suggested) — Vb48.9 L
Ported — Fb / F332.5 / 31.4 Hz
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About this driver

The Dayton Audio RS225-4 is a 8″ woofer with a free-air resonance of 33 Hz and a total Q (Qts) of 0.41. Its efficiency-bandwidth product (EBP) of 63 points toward either alignment. In a 23.5 L sealed box it reaches an F3 of 56.9 Hz (Qtc 0.707); a suggested 48.9 L box tuned to 32.5 Hz extends to about 31.4 Hz. See the sealed vs ported guide for how to choose.

Reference series; aluminum cone; Vd 128.2 cm3.

Recommended partners

modeled estimate

The tweeters below pair well with the Dayton Audio RS225-4 in a two-way design — each grade is a modeled estimate of the crossover match, with a suggested crossover point. Open any pair in the guided builder to design the crossover and total the parts.

Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.

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