What we know about the measurement:

SunAudio Purified 4 4XA25A Alu+Alu is a passive bookshelves that cost around 3300 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: 71.3dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 71.3Hz (resp. 62.6Hz).
  • Reference level is normalised to -0.1dB 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°, 10.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 6.48 and would be 9.21 with a perfect subwoofer.
      • Details: NBD: ON 0.186, LW 0.114, SP 0.137, PIR 0.095; SM: SP0.981, PIR0.985; LFQ 0.489, LFX 62Hz
  • Link to Original review.
  • Note: Version with 25mm aluminium tweeter (BlieSMa T25A-6 tweeter) and aluminium woofer (Purifi PTT4.0X04-NLC-04). Crossovers are at 2200Hz and 4145Hz. Measurements are done with a Klippel NFS from https://www.dausend-acoustics.com/.