Dayton Audio ND90-4
fullrange · EBP 125 → suits a ported box · nominal (full) — Dayton Audio datasheet (https://www.daytonaudio.com/images/resources/ND90-4%203-1_2_%20Aluminum%20Cone%20Full-Range%20Driver%204%20Ohm%20Specification%20Sheet.pdf)
Thiele/Small parameters
| Fs (resonance) | 90.2 Hz |
| Qts | 0.63 |
| Qes / Qms | 0.72 / 5.1 |
| Vas | 1.1 L |
| Re / nominal Z | 3.6 Ω / 4 Ω |
| Xmax | 4.0 mm |
| Sensitivity | 82.2 dB (1 W/1 m, calc); 85.7 dB (2.83 V/1 m, mfr) |
| Power handling | 20 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building.
Datasheet (PDF) ↗ — manufacturer-hosted
Recommended enclosures
| Sealed (Qtc 0.707) — Vb | 4.1 L |
| Sealed — Fc / F3 | 101.2 / 101.2 Hz |
| Ported (suggested) — Vb | 4.6 L |
| Ported — Fb / F3 | 57.2 / 49.5 Hz |
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About this driver
The Dayton Audio ND90-4 is a 3″ fullrange with a free-air resonance of 90.2 Hz and a total Q (Qts) of 0.63. Its efficiency-bandwidth product (EBP) of 125 points toward a ported alignment. In a 4.1 L sealed box it reaches an F3 of 101.2 Hz (Qtc 0.707); a suggested 4.6 L box tuned to 57.2 Hz extends to about 49.5 Hz. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThe tweeters below pair well with the Dayton Audio ND90-4 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 2.61 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SB29RDC-C000-4Good match· 92/100
Suggested crossover 2.61 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Peerless by Tymphany D27TG35-06Good match· 92/100
Suggested crossover 2.61 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS28F-4Good match· 92/100
Suggested crossover 2.61 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio AMT3-4Good match· 92/100
Suggested crossover 2.61 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio DC28F-8Good match· 92/100
Suggested crossover 2.61 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.