What we know about the measurement:

NHT C3 is a passive bookshelves that cost around 600 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 63.0Hz (resp. 52.7Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.3dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-70.0°, 70.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-20.0°, 30.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 4.29 and would be 6.7 with a perfect subwoofer.
      • Details: NBD: ON 0.422, LW 0.343, SP 0.375, PIR 0.324; SM: SP0.704, PIR0.45; LFQ 0.729, LFX 52Hz
    • Tonality (Preference) Score is 6.52 with an EQ and would be 8.6 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.287, LW 0.234, SP 0.255, PIR 0.196; SM: SP0.955, PIR0.958; LFQ 0.644, LFX 43Hz
  • Link to Original review.
NHT C3
AutomaticEQ (IIR)
Set preamp gain to: -2.7dB.
Type Freq Q Gain
3 44.0 1.08 3.0
3 109.0 1.53 -2.85
3 470.0 1.54 -2.15
3 739.0 2.75 1.67
3 1083.0 2.98 2.0
3 7059.0 1.5 -2.3
3 15685.0 0.96 -5.16
Download

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

NHT C3 filters_auto_eq

AutomaticEQ

NHT C3 filters_eq_full

Target v.s. EQ

NHT C3
flipflop@ASR (IIR)
Set preamp gain to: -2.2dB.
Type Freq Q Gain
3 330.0 2.5 0.4
3 369.0 15.0 -0.7
3 432.0 10.0 -0.3
3 501.0 1.6 -1.5
3 730.0 2.8 1.8
3 815.0 10.0 0.4
3 1090.0 3.4 2.1
3 1335.0 9.0 -0.7
3 1559.0 10.0 1.5
3 1730.0 10.0 -0.8
3 1888.0 15.0 1.1
3 2095.0 13.0 -1.1
3 2285.0 16.0 1.2
3 2495.0 14.0 -1.0
3 2715.0 10.0 1.9
3 3240.0 14.0 0.5
3 3720.0 13.0 -1.0
6 4800.0 1.5772935127949521 -2.0
3 6660.0 8.0 -0.5
3 15600.0 2.0 -3.5
Download

These EQ is designed by ASR member flipflop.

NHT C3
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 0.0
3 400.0 2.14 -0.25
3 630.0 2.14 0.0
3 1000.0 2.14 0.5
3 1600.0 2.14 0.25
3 2500.0 2.14 0.25
3 4000.0 2.14 0.0
3 6300.0 2.14 -0.25
3 10000.0 2.14 -0.25
3 16000.0 2.14 -0.75
Download

These EQ is designed for a 15 bands graphical EQ.

NHT C3
Graphic EQ 31 bands
Set preamp gain to: -0.4dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.25
3 31.0 4.32 0.25
3 40.0 4.32 0.25
3 50.0 4.32 0.25
3 63.0 4.32 0.25
3 80.0 4.32 0.0
3 100.0 4.32 -0.25
3 125.0 4.32 -0.25
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 -0.25
3 400.0 4.32 -0.25
3 500.0 4.32 -0.25
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 0.0
3 2000.0 4.32 -0.25
3 2500.0 4.32 -0.25
3 3150.0 4.32 -0.25
3 4000.0 4.32 -0.25
3 5000.0 4.32 -0.25
3 6300.0 4.32 -0.5
3 8000.0 4.32 -0.5
3 10000.0 4.32 -0.5
3 12000.0 4.32 -0.5
3 16000.0 4.32 -0.75
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

NHT C3: comparison between EQs
NHT C3

Comparison betweens various EQs

NHT C3

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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