What we know about the measurement:
SunAudio Purified 4 4XA25A tw35mm is a passive bookshelves that cost around 2800 USD for a pair.
 Quality of the measurement data is high.
 Origin of the data is SunAudio.
 Format of the data is a set of 36 horizontal and 36 vertical measurements .

Sensitivity:
 Sensitivity: 81.3dB (avg. 100Hz1kHz for 2.83V estimated at 1m).
 Sensitivity: 71.8dB computed at the measurement distance (3.0m) over the same frequency range.
 3dB (resp. 6db) point v.s. reference is at 73.4Hz (resp. 56.6Hz).
 Reference level is normalised to 0.3dB computed over the frequency range [300.0Hz, 5000.0Hz].
 Frequency deviation is 2.0dB over the same frequency range.
 Directivity
 Horizontal directivity is (80.0°, 80.0°) between 1kHz and 10kHz. Angle computed for +/6dB.
 Vertical directivity is (30.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/6dB.
 Tonality (Preference) Score
 Tonality (Preference) Score is 6.21
and would be 8.81 with a
perfect subwoofer.
 Details: NBD: ON 0.197, LW 0.167, SP 0.229, PIR 0.171; SM: SP0.922, PIR0.919; LFQ 0.983, LFX 58Hz
 Tonality (Preference) Score is 6.21
and would be 8.81 with a
perfect subwoofer.
 Link to Original review.
 Note: Sun Audio Purified 4 XP25A with a 35mm tweeter: crossover: Woofer: BW12 @ 1495Hz Tweeter: BW18 @ 2201Hz. Measurements are done at 3m.