What we know about the measurement:

XTZ Spirit 4 is a passive bookshelves that cost around 477 USD for a pair.

  • 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 49.7Hz (resp. 44.9Hz).
  • Reference level is normalised to -0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.4dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 4.41 and would be 6.53 with a perfect subwoofer.
      • Details: NBD: ON 0.627, LW 0.537, SP 0.455, PIR 0.466; SM: SP0.89, PIR0.778; LFQ 0.886, LFX 44Hz
    • Tonality (Preference) Score is 5.98 with an EQ and would be 7.93 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.408, LW 0.319, SP 0.291, PIR 0.263; SM: SP0.94, PIR0.886; LFQ 0.886, LFX 41Hz
  • Link to original Review: asr review. .
  • Vendor specifications:
    • Sensitivity 86 dB
    • Impedance 4 Ohm
    • Size
      • Width 190mm
      • Height 350mm
      • Depth 270mm
    • Weight 8.1kg
XTZ Spirit 4
AutomaticEQ (IIR)
Set preamp gain to: -2.7dB.
Type Freq Q Gain
PK 41.0 2.8 2.84
PK 144.0 0.94 -1.51
PK 369.0 3.0 0.55
PK 540.0 2.98 2.1
PK 942.0 1.14 -1.95
PK 1532.0 3.0 3.0
PK 2765.0 2.98 0.97
Download
This EQ optimise the Harman score and is a good start for far field listening like in your living room.
XTZ Spirit 4
AutomaticEQ LW (IIR)
Set preamp gain to: -2.2dB.
Type Freq Q Gain
PK 49.0 2.98 2.88
PK 62.0 2.08 -1.36
PK 160.0 0.85 -1.52
PK 1083.0 0.96 -4.09
PK 1121.0 0.37 2.18
PK 1480.0 3.0 3.0
PK 7059.0 2.87 1.57
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)
XTZ Spirit 4: comparison between EQs
AutomaticEQ
Target v.s. EQ
Comparison betweens various EQs
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