Dayton Audio ND140-4
midwoofer · EBP 82 → suits either box · nominal (full) — Dayton Audio datasheet (https://www.daytonaudio.com/images/resources/290-216-dayton-audio-nd140-4-specifications.pdf)
Thiele/Small parameters
| Fs (resonance) | 59.2 Hz |
| Qts | 0.63 |
| Qes / Qms | 0.72 / 5.35 |
| Vas | 7.2 L |
| Re / nominal Z | 3.7 Ω / 4 Ω |
| Xmax | 4.0 mm |
| Sensitivity | 85.0 dB (1 W/1 m, calc); 88.4 dB (2.83 V/1 m, mfr) |
| Power handling | 40 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building.
Datasheet (PDF) ↗ — manufacturer-hosted
Recommended enclosures
| Sealed (Qtc 0.707) — Vb | 27.8 L |
| Sealed — Fc / F3 | 66.4 / 66.4 Hz |
| Ported (suggested) — Vb | 31.4 L |
| Ported — Fb / F3 | 37.5 / 32.5 Hz |
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About this driver
The Dayton Audio ND140-4 is a 5″ midwoofer with a free-air resonance of 59.2 Hz and a total Q (Qts) of 0.63. Its efficiency-bandwidth product (EBP) of 82 points toward either alignment. In a 27.8 L sealed box it reaches an F3 of 66.4 Hz (Qtc 0.707); a suggested 31.4 L box tuned to 37.5 Hz extends to about 32.5 Hz. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThe tweeters below pair well with the Dayton Audio ND140-4 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· 92/100
Suggested crossover 1.57 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SB29RDC-C000-4Good match· 92/100
Suggested crossover 1.57 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SATORI TW29BGood match· 92/100
Suggested crossover 1.57 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SATORI TW29B-BGood match· 92/100
Suggested crossover 1.57 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SATORI TW29D-BGood match· 92/100
Suggested crossover 1.57 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SB29RDAC-C000-4Good match· 92/100
Suggested crossover 1.57 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.