SB Acoustics SB17NRX2C35-4
midwoofer · EBP 88 → suits either box · nominal (full) — SB Acoustics datasheet (manufacturer)
Thiele/Small parameters
| Fs (resonance) | 36 Hz |
| Qts | 0.37 |
| Qes / Qms | 0.41 / 4.49 |
| Vas | 27.6 L |
| Re / nominal Z | 3.1 Ω / 4 Ω |
| Xmax | 5.5 mm |
| Sensitivity | 86.8 dB (1 W/1 m, calc); 90 dB (2.83 V/1 m, mfr) |
| Power handling | 60 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building. datasheet
Recommended enclosures
| Sealed (Qtc 0.707) — Vb | 10.4 L |
| Sealed — Fc / F3 | 68.8 / 68.8 Hz |
| Ported (suggested) — Vb | 20.7 L |
| Ported — Fb / F3 | 39.3 / 39.8 Hz |
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About this driver
The SB Acoustics SB17NRX2C35-4 is a 6″ midwoofer with a free-air resonance of 36 Hz and a total Q (Qts) of 0.37. Its efficiency-bandwidth product (EBP) of 88 points toward either alignment. In a 10.4 L sealed box it reaches an F3 of 68.8 Hz (Qtc 0.707); a suggested 20.7 L box tuned to 39.3 Hz extends to about 39.8 Hz. See the sealed vs ported guide for how to choose.
Xmax = (coil 16 mm - gap 5 mm)/2; rated 90 dB is nominal (independent ~86-88 dB).
Recommended partners
modeled estimateThe tweeters below pair well with the SB Acoustics SB17NRX2C35-4 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· 91/100
Suggested crossover 1.34 kHz (4th-order, Linkwitz-Riley)
Build this pair → - SB Acoustics SB29RDC-C000-4Good match· 89/100
Suggested crossover 1.34 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio RS28F-4Good match· 85/100
Suggested crossover 1.34 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Peerless by Tymphany D27TG35-06Good match· 84/100
Suggested crossover 1.37 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Dayton Audio ND25FA-4Moderate match· 56/100
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.