SB Acoustics SB15NBAC30-4 standard measurements on LoudspeakerLab. 88.0 dB sensitivity. Fs 33 Hz. Qts 0.290. Evidence grade C+ (57.0/100).
Fs: 33 Hz; Qts: 0.290; Qes: 0.310; Qms: 4.400; Vas: 21.00 L; Sd: 82.0 cm²; Re: 3.10 Ω; Le: 0.12 mH; Sensitivity: 88.0 dB; Nominal Z: 4.0 Ω; Measured range: 21-19125 Hz
On-axis flatness 58 · DI tracking 63 · DI smoothness 39
Scored passband 62 Hz–3.2 kHz
Spec-sheet profiles · Off-axis H/V response data available.
Vented ~9.2 L · Fb 50 Hz
LoudspeakerLab evidence grade: C+ (57.0/100). Based on measurement provenance, off-axis data, distortion, and T/S completeness.