What we know about the measurement:

Andersson HIS 2.1 is a passive center that cost around 20 USD

  • Quality of the measurement data is low.
  • Origin of the data is Misc.
  • Format of the data is a set of 36 horizontal and 36 vertical measurements .
  • -3dB (resp. -6db) point v.s. reference is at 99.3Hz (resp. 59.1Hz).
  • Reference level is normalised to 0.5dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 3.0dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 1.52 and would be 3.93 with a perfect subwoofer.
      • Details: NBD: ON 0.941, LW 0.665, SP 0.799, PIR 0.734; SM: SP0.578, PIR0.341; LFQ 0.864, LFX 52Hz
    • Tonality (Preference) Score is 5.35 with an EQ and would be 7.74 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.511, LW 0.303, SP 0.365, PIR 0.286; SM: SP0.95, PIR0.942; LFQ 0.864, LFX 51Hz
  • Link to original Review: asr review. .
  • Vendor specifications:
    • Sensitivity 89 dB
    • Impedance 8 Ohm
    • Size
      • Width 460mm
      • Height 160mm
      • Depth 190mm
    • Weight 4.0kg
Andersson HIS 2.1
AutomaticEQ (IIR)
Set preamp gain to: -1.6dB.
Type Freq Q Gain
PK 102.0 2.99 3.0
PK 149.0 1.95 -8.95
PK 454.0 0.92 2.04
PK 1244.0 2.99 -3.45
PK 2023.0 2.95 3.0
PK 2862.0 1.14 -1.94
PK 10707.0 1.05 -7.45
Download
This EQ optimise the Harman score and is a good start for far field listening like in your living room.
Andersson HIS 2.1
AutomaticEQ LW (IIR)
Set preamp gain to: -4.6dB.
Type Freq Q Gain
PK 102.0 3.0 3.0
PK 155.0 1.86 -9.0
PK 879.0 0.25 1.96
PK 1954.0 3.0 2.99
PK 9989.0 1.37 -2.88
PK 11882.0 2.41 -2.13
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)
Andersson HIS 2.1: comparison between EQs
AutomaticEQ
Target v.s. EQ
Comparison betweens various EQs
;