Dayton Audio ND65-8
fullrange · EBP 144 → suits a ported box · nominal (full) — Dayton Audio datasheet (https://www.daytonaudio.com/images/resources/290-206-dayton-audio-nd65-8-specifications.pdf)
Thiele/Small parameters
| Fs (resonance) | 102 Hz |
| Qts | 0.65 |
| Qes / Qms | 0.71 / 8.23 |
| Vas | 0.4 L |
| Re / nominal Z | 7.4 Ω / 8 Ω |
| Xmax | 3.5 mm |
| Sensitivity | 79.1 dB (1 W/1 m, calc); 79.6 dB (2.83 V/1 m, mfr) |
| Power handling | 15 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building.
Datasheet (PDF) ↗ — manufacturer-hosted
Recommended enclosures
| Sealed (Qtc 0.707) — Vb | 2.0 L |
| Sealed — Fc / F3 | 110.9 / 111.0 Hz |
| Ported (suggested) — Vb | 1.7 L |
| Ported — Fb / F3 | 62.6 / 54.2 Hz |
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About this driver
The Dayton Audio ND65-8 is a 2.5″ fullrange with a free-air resonance of 102 Hz and a total Q (Qts) of 0.65. Its efficiency-bandwidth product (EBP) of 144 points toward a ported alignment. In a 2.0 L sealed box it reaches an F3 of 111.0 Hz (Qtc 0.707); a suggested 1.7 L box tuned to 62.6 Hz extends to about 54.2 Hz. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThe tweeters below pair well with the Dayton Audio ND65-8 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 3.59 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SB29RDC-C000-4Good match· 92/100
Suggested crossover 3.59 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio ND25FA-4Good match· 92/100
Suggested crossover 3.59 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Peerless by Tymphany D27TG35-06Good match· 92/100
Suggested crossover 3.59 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS28F-4Good match· 92/100
Suggested crossover 3.59 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio AMT3-4Good match· 92/100
Suggested crossover 3.59 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.