What we know about the measurement:

Optimal Audio Cuboid 15 is a passive bookshelves that cost around 1035 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 45.0Hz (resp. 38.7Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 5.8dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 2.12 and would be 3.9 with a perfect subwoofer.
      • Details: NBD: ON 0.843, LW 0.848, SP 0.89, PIR 0.858; SM: SP0.595, PIR0.381; LFQ 1.358, LFX 37Hz
    • Tonality (Preference) Score is 5.11 with an EQ and would be 6.57 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.573, LW 0.561, SP 0.621, PIR 0.59; SM: SP0.92, PIR0.896; LFQ 1.172, LFX 31Hz
  • Vendor specifications:
    • Dispersion: 80° horizontal and 50° vertical.
    • Sensitivity 99 dB
    • Impedance 8 Ohm
    • SPL
      • max: 126 dB
      • peak: 132 dB
    • Size
      • Width 626mm
      • Height 691mm
      • Depth 416mm
    • Weight 28.0kg
Optimal Audio Cuboid 15
AutomaticEQ (IIR)
Set preamp gain to: -3.3dB.
Type Freq Q Gain
PK 30.0 1.07 3.0
PK 74.0 1.76 -5.87
PK 260.0 3.0 1.69
PK 2168.0 3.0 3.0
PK 2579.0 1.66 2.85
PK 3912.0 2.99 -2.97
PK 10707.0 0.28 -5.79
Download
This EQ optimise the Harman score and is a good start for far field listening like in your living room.
Optimal Audio Cuboid 15
AutomaticEQ LW (IIR)
Set preamp gain to: -1.9dB.
Type Freq Q Gain
PK 46.0 2.99 3.0
PK 72.0 1.37 -5.34
PK 260.0 2.99 1.44
PK 470.0 2.98 -1.99
PK 2245.0 3.0 2.99
PK 2324.0 0.67 -0.96
PK 7834.0 1.03 -1.74
Download
This EQ optimise for a flat listening window and is a good start for near field listening like on your desk.
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)
Optimal Audio Cuboid 15: comparison between EQs
AutomaticEQ
Target v.s. EQ
Comparison betweens various EQs
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