What we know about the measurement:

NHT Super Zero 2.1 is a passive bookshelves that cost around 250 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is ASR.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 84.2dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 101.1Hz (resp. 85.0Hz).
  • Reference level is normalised to -0.4dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 3.4dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-60.0°, 60.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-30.0°, 30.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 3.37 and would be 6.67 with a perfect subwoofer.
      • Details: NBD: ON 0.505, LW 0.424, SP 0.546, PIR 0.455; SM: SP0.787, PIR0.696; LFQ 0.563, LFX 84Hz
    • Tonality (Preference) Score is 5.03 with an EQ and would be 8.1 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.385, LW 0.295, SP 0.34, PIR 0.258; SM: SP0.924, PIR0.926; LFQ 0.563, LFX 74Hz
  • Link to Original review.
NHT Super Zero 2.1
AutomaticEQ (IIR)
Set preamp gain to: -2.6dB.
Type Freq Q Gain
3 88.0 1.43 3.0
3 160.0 1.54 -2.87
3 356.0 2.98 0.85
3 1887.0 0.38 -1.69
3 1954.0 3.0 2.97
3 2862.0 0.99 2.89
3 4342.0 0.9 -1.75
Download

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

NHT Super Zero 2.1 filters_auto_eq

AutomaticEQ

NHT Super Zero 2.1 filters_eq_full

Target v.s. EQ

NHT Super Zero 2.1
flipflop@ASR (IIR)
Set preamp gain to: -2.7dB.
Type Freq Q Gain
3 405.0 7.0 0.4
3 614.0 6.0 -0.5
3 688.0 20.0 -0.6
3 799.0 18.0 -1.2
3 910.0 3.5 -1.2
3 1190.0 15.0 0.7
3 1352.0 6.0 -1.7
3 1578.0 10.0 1.2
3 1940.0 9.0 2.4
3 2290.0 8.0 2.5
3 2495.0 15.0 -1.6
3 2750.0 15.0 1.1
3 3350.0 8.0 1.4
3 3735.0 25.0 -0.8
3 4410.0 15.0 0.9
3 4760.0 20.0 -0.5
3 5360.0 13.0 -0.8
3 5920.0 6.5 1.0
3 10800.0 6.0 -0.5
3 15540.0 2.8 -0.6
Download

These EQ is designed by ASR member flipflop.

NHT Super Zero 2.1
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
3 25.0 2.14 0.5
3 40.0 2.14 0.5
3 63.0 2.14 0.5
3 100.0 2.14 0.5
3 160.0 2.14 -0.25
3 250.0 2.14 -0.25
3 400.0 2.14 0.0
3 630.0 2.14 0.0
3 1000.0 2.14 -0.25
3 1600.0 2.14 0.25
3 2500.0 2.14 0.5
3 4000.0 2.14 -0.25
3 6300.0 2.14 -0.25
3 10000.0 2.14 -0.25
3 16000.0 2.14 0.0
Download

These EQ is designed for a 15 bands graphical EQ.

NHT Super Zero 2.1
Graphic EQ 31 bands
Set preamp gain to: -0.9dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.5
3 31.0 4.32 0.5
3 40.0 4.32 0.5
3 50.0 4.32 0.5
3 63.0 4.32 0.5
3 80.0 4.32 0.5
3 100.0 4.32 0.5
3 125.0 4.32 0.0
3 160.0 4.32 -0.25
3 200.0 4.32 -0.25
3 250.0 4.32 -0.25
3 315.0 4.32 0.0
3 400.0 4.32 0.0
3 500.0 4.32 0.0
3 630.0 4.32 0.0
3 800.0 4.32 -0.25
3 1000.0 4.32 -0.25
3 1250.0 4.32 0.0
3 1600.0 4.32 0.25
3 2000.0 4.32 0.75
3 2500.0 4.32 0.5
3 3150.0 4.32 0.25
3 4000.0 4.32 0.0
3 5000.0 4.32 -0.25
3 6300.0 4.32 0.0
3 8000.0 4.32 0.0
3 10000.0 4.32 0.0
3 12000.0 4.32 0.0
3 16000.0 4.32 0.25
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

NHT Super Zero 2.1: comparison between EQs
NHT Super Zero 2.1

Comparison betweens various EQs

NHT Super Zero 2.1

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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