What we know about the measurement:

Optimal Audio Cuboid 3 is a passive bookshelves that cost around 85 USD each.

  • Quality of the measurement data is low.
  • Origin of the data is Optimal Audio.
  • Format of the data is a GLL file .
  • -3dB (resp. -6db) point v.s. reference is at 115.0Hz (resp. 97.5Hz).
  • Reference level is normalised to 0.2dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 6.8dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is -0.46 and would be 3.15 with a perfect subwoofer.
      • Details: NBD: ON 0.809, LW 0.816, SP 0.893, PIR 0.842; SM: SP0.062, PIR0.003; LFQ 0.482, LFX 100Hz
    • Tonality (Preference) Score is 3.37 with an EQ and would be 6.68 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.46, LW 0.46, SP 0.552, PIR 0.497; SM: SP0.801, PIR0.705; LFQ 0.37, LFX 84Hz
  • Vendor specifications:
    • Dispersion: 130° horizontal and 120° vertical.
    • Sensitivity 84 dB
    • Impedance 16 Ohm
    • Size
      • Width 120mm
      • Height 190mm
      • Depth 118mm
    • Weight 1.26kg
Optimal Audio Cuboid 3
AutomaticEQ (IIR)
Set preamp gain to: -3.4dB.
Type Freq Q Gain
PK 98.0 1.82 3.0
PK 235.0 1.22 -3.74
PK 1429.0 2.2 -2.35
PK 2324.0 1.49 3.0
PK 2765.0 2.2 3.0
PK 11085.0 0.41 -8.33
PK 13186.0 2.9 -8.93
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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