Scan-Speak 28W/4878T01 standard measurements on LoudspeakerLab. 91.0 dB sensitivity. Fs 23 Hz. Qts 0.260. Evidence grade C+ (57.0/100).
Fs: 23 Hz; Qts: 0.260; Qes: 0.270; Qms: 6.210; Vas: 104.00 L; Sd: 363.0 cm²; Re: 3.10 Ω; Le: 0.50 mH; Sensitivity: 91.0 dB; Nominal Z: 4.0 Ω; Measured range: 21-19179 Hz
On-axis flatness 54 · DI tracking 31 · DI smoothness 40
Scored passband 36 Hz–2.2 kHz
Spec-sheet profiles · Off-axis H/V response data available.
Vented ~38.2 L · Fb 39 Hz
LoudspeakerLab evidence grade: C+ (57.0/100). Based on measurement provenance, off-axis data, distortion, and T/S completeness.