SB Acoustics SB17NRX2L35-8
midwoofer · EBP 126 → suits a ported box · nominal (full) — SB Acoustics datasheet (https://sbacoustics.com/wp-content/uploads/2025/03/6in-SB17NRX2L35-8.pdf)
Thiele/Small parameters
| Fs (resonance) | 37.8 Hz |
| Qts | 0.28 |
| Qes / Qms | 0.3 / 4.55 |
| Vas | 26.1 L |
| Re / nominal Z | 5.7 Ω / 8 Ω |
| Xmax | — |
| Sensitivity | 88.5 dB (1 W/1 m, calc); 89 dB (2.83 V/1 m, mfr) |
| Power handling | 50 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building.
Datasheet (PDF) ↗ — manufacturer-hosted
Recommended enclosures
| Sealed (Qtc 0.707) — Vb | 4.9 L |
| Sealed — Fc / F3 | 95.4 / 95.5 Hz |
| Ported (suggested) — Vb | 7.8 L |
| Ported — Fb / F3 | 54.9 / 63.4 Hz |
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About this driver
The SB Acoustics SB17NRX2L35-8 is a 6″ midwoofer with a free-air resonance of 37.8 Hz and a total Q (Qts) of 0.28. Its efficiency-bandwidth product (EBP) of 126 points toward a ported alignment. In a 4.9 L sealed box it reaches an F3 of 95.5 Hz (Qtc 0.707); a suggested 7.8 L box tuned to 54.9 Hz extends to about 63.4 Hz. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThe tweeters below pair well with the SB Acoustics SB17NRX2L35-8 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 M64F001Good match· 91/100
Suggested crossover 1.34 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Seas MR18REX-XFGood match· 91/100
Suggested crossover 1.34 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Seas T25CF002Good match· 91/100
Suggested crossover 1.34 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Seas T29CF002Good match· 91/100
Suggested crossover 1.34 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Seas T29D001Good match· 91/100
Suggested crossover 1.34 kHz (4th-order, Linkwitz-Riley)
Build this pair → - Seas T29D002Good match· 91/100
Suggested crossover 1.34 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.