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 .
  • Sensitivity: 79.1dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -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.
  • Directivity
    • Horizontal directivity is (-60.0°, 60.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-20.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • 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 270 mm)
    • Weight 8.1 kg
XTZ Spirit 4
AutomaticEQ (IIR)
Set preamp gain to: -2.7dB.
Type Freq Q Gain
3 41.0 2.8 2.84
3 144.0 0.94 -1.51
3 369.0 3.0 0.55
3 540.0 2.98 2.1
3 942.0 1.14 -1.95
3 1532.0 3.0 3.0
3 2765.0 2.98 0.97
Download

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

XTZ Spirit 4 filters_auto_eq

AutomaticEQ

XTZ Spirit 4 filters_eq_full

Target v.s. EQ

XTZ Spirit 4
AutomaticEQ LW (IIR)
Set preamp gain to: -2.2dB.
Type Freq Q Gain
3 49.0 2.98 2.88
3 62.0 2.08 -1.36
3 160.0 0.85 -1.52
3 1083.0 0.96 -4.09
3 1121.0 0.37 2.18
3 1480.0 3.0 3.0
3 7059.0 2.87 1.57
Download

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

XTZ Spirit 4: comparison between EQs
XTZ Spirit 4

Comparison betweens various EQs

XTZ Spirit 4

Improvements made by 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
Frequency Frequency with EQ
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