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 .
  • Sensitivity:
    • Company: 99 dB
    • Measured: 100.6 dB (avg. 300Hz-3kHz for 2.83V estimated at 1m).
    • Measured: 80.6 dB computed at the measurement distance (10.0m) over the same frequency range.
  • -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
Optimal Audio Cuboid 15

Vendor specifications

  • Dispersion: 80° horizontal and 50° vertical.
  • Impedance 8 Ohm
  • SPL
    • max: 126 dB
    • peak: 132 dB
  • Size
    • Width 626mm
    • Height 691mm
    • Depth 416mm
  • Weight 28.0kg

Directivity (-6dB)

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
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This EQ optimise the Harman score and is a good start for far field listening like in your living room.
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
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This EQ optimise for a flat listening window and is a good start for near field listening like on your desk.
Quick config:
Quick config:
Quick config:
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