What we know about the measurement:

LOGProfessional Alpha is an active bookshelves that cost around 5930 USD for a pair.

  • Quality of the measurement data is medium.
  • Origin of the data is Sound and Recording.
  • Format of the data is a scanned image .
  • -3dB (resp. -6db) point v.s. reference is at 67.1Hz (resp. 52.7Hz).
  • Reference level is normalised to 0.5dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 1.2dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 5.9 and would be 8.23 with a perfect subwoofer.
      • Details: NBD: ON 0.182, LW 0.186, SP 0.34, PIR 0.24; SM: SP0.811, PIR0.745; LFQ 0.957, LFX 50Hz
    • Tonality (Preference) Score is 6.89 with an EQ and would be 8.72 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.165, LW 0.169, SP 0.33, PIR 0.224; SM: SP0.91, PIR0.915; LFQ 0.802, LFX 38Hz
  • Link to original Review: snr review. .
  • Vendor specifications:
    • Size
      • Width 220mm
      • Height 340mm
      • Depth 220mm
    • Weight 7.0kg
LOGProfessional Alpha
AutomaticEQ (IIR)
Set preamp gain to: -4.4dB.
Type Freq Q Gain
PK 40.0 1.12 2.98
PK 69.0 0.44 2.29
PK 92.0 1.71 -2.21
PK 121.0 0.96 -1.75
PK 310.0 1.16 -1.02
PK 1333.0 2.98 -1.01
PK 9648.0 0.5 -2.34
Download
This EQ optimise the Harman score and is a good start for far field listening like in your living room.
Improvement made by adding the above EQ
EQ
AutoEQ
Target v.s. EQ
Target v.s. EQ
Histogram of errors
On Axis (fullrange)
Listening Window (fullrange)
Predicted In-Room Response (fullrange)
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