What we know about the measurement:

GR Research NX-Bravo is a passive bookshelves that cost around 1525 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is ErinsAudioCorner.
  • Format of the data is generated by a Klippel NFS .
  • -3dB (resp. -6db) point v.s. reference is at 76.9Hz (resp. 54.2Hz).
  • Reference level is normalised to -0.2dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.0dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 5.24 and would be 7.57 with a perfect subwoofer.
      • Details: NBD: ON 0.398, LW 0.387, SP 0.377, PIR 0.35; SM: SP0.935, PIR0.832; LFQ 0.483, LFX 50Hz
    • Tonality (Preference) Score is 5.77 with an EQ and would be 7.84 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.358, LW 0.347, SP 0.368, PIR 0.324; SM: SP0.947, PIR0.874; LFQ 0.532, LFX 43Hz
  • Link to original Review: eac review. Links to other reviews: yt review .
  • Note: Speaker is designed to be listen at a 15 degrees angle..
  • Vendor specifications:
    • Sensitivity 87 dB
    • Impedance 4.7 Ohm
    • Size
      • Width 190mm
      • Height 355mm
      • Depth 292mm
GR Research NX-Bravo
AutomaticEQ (IIR)
Set preamp gain to: -2.9dB.
Type Freq Q Gain
PK 42.0 1.29 2.45
PK 80.0 1.42 2.0
PK 369.0 2.66 0.99
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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