What we know about the measurement:

GR Research AV123 is a passive center that cost around 500 USD

  • Quality of the measurement data is high.
  • Origin of the data is ASR.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 84.1dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 67.4Hz (resp. 58.6Hz).
  • Reference level is normalised to -0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.7dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-30.0°, 30.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-50.0°, 60.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 1.03 and would be 3.64 with a perfect subwoofer.
      • Details: NBD: ON 0.832, LW 0.725, SP 0.735, PIR 0.672; SM: SP0.121, PIR0.02; LFQ 1.899, LFX 58Hz
    • Tonality (Preference) Score is 4.59 with an EQ and would be 7.2 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.549, LW 0.432, SP 0.442, PIR 0.366; SM: SP0.86, PIR0.855; LFQ 1.899, LFX 58Hz
  • Link to original Review: asr review. .
GR Research AV123
AutomaticEQ (IIR)
Set preamp gain to: -7.2dB.
Type Freq Q Gain
3 85.0 3.0 -7.56
3 172.0 1.0 8.0
3 279.0 2.85 -3.79
3 1202.0 1.09 0.85
3 2094.0 2.26 -2.23
3 6818.0 0.5 -1.99
3 13186.0 2.77 -2.29
Download

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

GR Research AV123 filters_auto_eq

AutomaticEQ

GR Research AV123 filters_eq_full

Target v.s. EQ

GR Research AV123
AutomaticEQ LW (IIR)
Set preamp gain to: -6.8dB.
Type Freq Q Gain
3 56.0 0.94 7.99
3 83.0 2.14 -12.99
3 172.0 0.91 7.39
3 279.0 2.99 -3.83
3 1954.0 0.79 1.96
3 2023.0 1.73 -4.36
3 13186.0 2.11 -1.95
Download

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

GR Research AV123
AutomaticEQ Score (IIR)
Set preamp gain to: -7.2dB.
Type Freq Q Gain
3 85.0 3.0 -7.56
3 172.0 1.0 8.0
3 279.0 2.85 -3.79
3 1202.0 1.09 0.85
3 2094.0 2.26 -2.23
3 6818.0 0.5 -1.99
3 13186.0 2.77 -2.29
Download

GR Research AV123: comparison between EQs
GR Research AV123

Comparison betweens various EQs

GR Research AV123

Improvements made by EQ
CEA2034
On Axis
Early Reflections
Estimated In-Room Response
Horizontal Reflections
Vertical Reflections
SPL Horizontal
SPL Vertical
SPL Horizontal Normalized
SPL Vertical Normalized
SPL Horizontal Contour
SPL Vertical Contour
SPL Horizontal Contour Normalized
SPL Vertical Contour Normalized
SPL Horizontal Contour 3D
SPL Vertical Contour 3D
SPL Horizontal Contour Normalized 3D
SPL Vertical Contour Normalized 3D
SPL Horizontal Radar
SPL Vertical Radar
CEA2034
On Axis
Early Reflections
Estimated In-Room Response
Horizontal Reflections
Vertical Reflections
SPL Horizontal
SPL Vertical
SPL Horizontal Normalized
SPL Vertical Normalized
SPL Horizontal Contour
SPL Vertical Contour
SPL Horizontal Contour Normalized
SPL Vertical Contour Normalized
SPL Horizontal Contour 3D
SPL Vertical Contour 3D
SPL Horizontal Contour Normalized 3D
SPL Vertical Contour Normalized 3D
SPL Horizontal Radar
SPL Vertical Radar
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
;