Dayton Audio ND25FA-4
tweeter · EBP 517 → suits a ported box · nominal (headline) — Dayton Audio ND25FA-4 spec sheet (manufacturer)
Thiele/Small parameters
| Fs (resonance) | 1350 Hz |
| Qts | 1.56 |
| Qes / Qms | 2.61 / 3.87 |
| Vas | — |
| Re / nominal Z | 3.2 Ω / 4 Ω |
| Xmax | — |
| Sensitivity | 90 dB (2.83 V/1 m, mfr) |
| Power handling | 20 W |
Published (nominal) values, params headline — verify by measurement (DATS/REW) before building. datasheet
Recommended enclosures
This is a tweeter; Thiele/Small box parameters are not used for enclosure design.
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About this driver
The Dayton Audio ND25FA-4 is a 1″ tweeter with a free-air resonance of 1350 Hz and a total Q (Qts) of 1.56. Its efficiency-bandwidth product (EBP) of 517 points toward a ported alignment. See the sealed vs ported guide for how to choose.
NOMINAL/manufacturer. Fs 1350 Hz; Sd 7.5 cm2; usable range 2500-20000 Hz (datasheet). Xmax/Vas/BL/Mms listed N/A on Dayton spec sheet. High Fs => practical crossover >= ~2.5-3 kHz.
Recommended partners
modeled estimateThe woofers and midranges below pair well with the Dayton Audio ND25FA-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.
- Peerless by Tymphany TC9FD18-08Good match· 88/100
Suggested crossover 2.42 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS52AN-8Good match· 84/100
Suggested crossover 4.05 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS125-4Good match· 80/100
Suggested crossover 2.02 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Tang Band W5-1611SAFModerate match· 67/100
Suggested crossover 2.02 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS150T-8Moderate match· 66/100
Suggested crossover 2.02 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS150-4Moderate match· 60/100
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.