Dayton Audio RS125-4
woofer · EBP 127 → suits a ported box · nominal (full) — Dayton Audio RS125-4 spec sheet (manufacturer)
Thiele/Small parameters
| Fs (resonance) | 57.2 Hz |
| Qts | 0.37 |
| Qes / Qms | 0.45 / 2.04 |
| Vas | 5.3 L |
| Re / nominal Z | 2.9 Ω / 4 Ω |
| Xmax | 4.0 mm |
| Sensitivity | 85.3 dB (1 W/1 m, calc); 89.9 dB (2.83 V/1 m, mfr) |
| Power handling | 30 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building. datasheet
Recommended enclosures
| Sealed (Qtc 0.707) — Vb | 2.0 L |
| Sealed — Fc / F3 | 109.3 / 109.3 Hz |
| Ported (suggested) — Vb | 4.0 L |
| Ported — Fb / F3 | 62.5 / 63.3 Hz |
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About this driver
The Dayton Audio RS125-4 is a 5″ woofer with a free-air resonance of 57.2 Hz and a total Q (Qts) of 0.37. Its efficiency-bandwidth product (EBP) of 127 points toward a ported alignment. In a 2.0 L sealed box it reaches an F3 of 109.3 Hz (Qtc 0.707); a suggested 4.0 L box tuned to 62.5 Hz extends to about 63.3 Hz. See the sealed vs ported guide for how to choose.
NOMINAL/manufacturer (Dayton spec sheet). Fs 57.2 Hz; Vas 5.29 L; Sd 52.8 cm2; BL 3.63 Tm; Mms 5.7 g; sensitivity 89.9 dB (2.83V/1m); usable 65-5400 Hz; Xmax 4.0 mm; 30 W. Aluminum Reference cone (sharp metal breakup above passband; datasheet prints no breakup-peak Hz).
Recommended partners
modeled estimateThe tweeters below pair well with the Dayton Audio RS125-4 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.
- Seas 27TBFC/G H1212-06Good match· 93/100
Suggested crossover 2.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SB29RDC-C000-4Good match· 93/100
Suggested crossover 2.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Peerless by Tymphany D27TG35-06Good match· 91/100
Suggested crossover 2.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS28F-4Good match· 87/100
Suggested crossover 2.01 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio ND25FA-4Good match· 80/100
Suggested crossover 2.02 kHz (4th-order, Linkwitz-Riley)
Build this pair →
Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.