Sine Design

Dayton Audio RS75-4

fullrange · EBP 182 → suits a ported box · nominal (full) — Dayton Audio datasheet (https://www.daytonaudio.com/images/resources/295-380-dayton-audio-rs75-4-spec-sheet-revised.pdf)

Thiele/Small parameters

Fs (resonance)177 Hz
Qts0.83
Qes / Qms0.97 / 5.76
Vas0.1 L
Re / nominal Z3.1 Ω / 4 Ω
Xmax1.1 mm
Sensitivity80.9 dB (1 W/1 m, calc); 85.2 dB (2.83 V/1 m, mfr)
Power handling15 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — VbInfinity L
Sealed — Fc / F3177.0 / 154.6 Hz
Ported (suggested) — Vb1.5 L
Ported — Fb / F384.6 / 75.7 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Dayton Audio RS75-4 is a 2″ fullrange with a free-air resonance of 177 Hz and a total Q (Qts) of 0.83. Its efficiency-bandwidth product (EBP) of 182 points toward a ported alignment. In a Infinity L sealed box it reaches an F3 of 154.6 Hz (Qtc 0.707); a suggested 1.5 L box tuned to 84.6 Hz extends to about 75.7 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Dayton Audio RS75-4 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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