What we know about the measurement:

AsciLab C5B is a passive bookshelves that cost around 1000 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is AsciLab.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 83.6dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 54.2Hz (resp. 43.9Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 1.9dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-50.0°, 50.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-40.0°, 50.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 6.22 and would be 8.16 with a perfect subwoofer.
      • Details: NBD: ON 0.294, LW 0.261, SP 0.251, PIR 0.235; SM: SP0.901, PIR0.827; LFQ 0.477, LFX 41Hz
    • Tonality (Preference) Score is 7.05 with an EQ and would be 8.63 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.27, LW 0.23, SP 0.216, PIR 0.196; SM: SP0.959, PIR0.954; LFQ 0.554, LFX 33Hz
  • Link to original Review: asr review. Links to other reviews: abi review .
  • Vendor specifications:
    • Size
      • Width 176mm
      • Height 362mm
      • Depth 230 mm)
    • Weight 10.4 kg
AsciLab C5B
AutomaticEQ (IIR)
Set preamp gain to: -3.8dB.
Type Freq Q Gain
PK 33.0 1.32 2.8
PK 54.0 0.77 1.98
PK 80.0 1.17 -1.72
PK 739.0 2.94 2.67
PK 849.0 1.89 -2.7
PK 1161.0 1.7 1.57
PK 8694.0 0.49 -1.37
Download

These EQ optimise the Harman score and is a good start for far field listening like in your living room.

AsciLab C5B filters_auto_eq

AutomaticEQ

AsciLab C5B filters_eq_full

Target v.s. EQ

AsciLab C5B
AutomaticEQ LW (IIR)
Set preamp gain to: -2.9dB.
Type Freq Q Gain
PK 49.0 2.14 3.0
PK 85.0 1.64 -0.58
PK 666.0 3.0 0.78
PK 1642.0 2.9 0.7
Download

These EQ optimise for a flat listening window and is a good start for near field listening like on your desk.

AsciLab C5B: comparison between EQs
AsciLab C5B

Comparison betweens various EQs

AsciLab C5B

Improvements made by EQ

Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
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