Sine Design

SB Acoustics SB17NRX2C35-8

midwoofer · EBP 78 → suits either box · nominal (full) — SB Acoustics datasheet (https://sbacoustics.com/wp-content/uploads/2020/02/6in-SB17NRX2C35-8.pdf)

Thiele/Small parameters

Fs (resonance)36.5 Hz
Qts0.42
Qes / Qms0.47 / 4.55
Vas27.0 L
Re / nominal Z5.7 Ω / 8 Ω
Xmax—
Sensitivity86.3 dB (1 W/1 m, calc); 87 dB (2.83 V/1 m, mfr)
Power handling50 W

Published (nominal) values, params full — verify by measurement (DATS/REW) before building.

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb14.7 L
Sealed — Fc / F361.4 / 61.5 Hz
Ported (suggested) — Vb30.8 L
Ported — Fb / F335.0 / 33.6 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The SB Acoustics SB17NRX2C35-8 is a 6″ midwoofer with a free-air resonance of 36.5 Hz and a total Q (Qts) of 0.42. Its efficiency-bandwidth product (EBP) of 78 points toward either alignment. In a 14.7 L sealed box it reaches an F3 of 61.5 Hz (Qtc 0.707); a suggested 30.8 L box tuned to 35.0 Hz extends to about 33.6 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the SB Acoustics SB17NRX2C35-8 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.

Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.

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