What we know about the measurement:

Hedd Type 20 MK2 is an active bookshelves that cost around 2400 USD each.

  • Quality of the measurement data is high.
  • Origin of the data is ASR.
  • Format of the data is generated by a Klippel NFS .
  • -3dB (resp. -6db) point v.s. reference is at 35.2Hz (resp. 33.7Hz).
  • Reference level is normalised to -0.0dB 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 (-40.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 6.21 and would be 7.79 with a perfect subwoofer.
      • Details: NBD: ON 0.401, LW 0.334, SP 0.366, PIR 0.322; SM: SP0.938, PIR0.895; LFQ 0.862, LFX 33Hz
    • Tonality (Preference) Score is 6.65 with an EQ and would be 8.15 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.36, LW 0.271, SP 0.32, PIR 0.253; SM: SP0.955, PIR0.915; LFQ 0.862, LFX 32Hz
  • Link to Original review.
Hedd Type 20 MK2
AutomaticEQ (IIR)
Set preamp gain to: -2.6dB.
Type Freq Q Gain
5 44.0 0.29 2.81
3 49.0 2.54 -2.82
3 93.0 1.67 1.02
3 214.0 2.61 1.33
3 271.0 2.65 -0.32
3 366.0 2.18 -0.35
3 1067.0 1.34 0.97
3 5490.0 2.89 0.94
3 14965.0 0.48 2.61
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These EQ optimise the Harman score and is a good start for far field listening like in your living room.

Hedd Type 20 MK2 filters_auto_eq

AutomaticEQ

Hedd Type 20 MK2 filters_eq_full

Target v.s. EQ

Hedd Type 20 MK2
Graphic EQ 15 bands
Set preamp gain to: -0.5dB.
Type Freq Q Gain
3 25.0 2.14 0.25
3 40.0 2.14 0.0
3 63.0 2.14 0.0
3 100.0 2.14 0.0
3 160.0 2.14 0.0
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 0.0
3 1600.0 2.14 0.0
3 2500.0 2.14 0.0
3 4000.0 2.14 0.0
3 6300.0 2.14 0.0
3 10000.0 2.14 0.25
3 16000.0 2.14 0.5
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These EQ is designed for a 15 bands graphical EQ.

Hedd Type 20 MK2
Graphic EQ 31 bands
Set preamp gain to: -0.5dB.
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 0.0
3 50.0 4.32 -0.25
3 63.0 4.32 0.0
3 80.0 4.32 0.25
3 100.0 4.32 0.0
3 125.0 4.32 0.0
3 160.0 4.32 0.0
3 200.0 4.32 0.25
3 250.0 4.32 0.0
3 315.0 4.32 0.0
3 400.0 4.32 -0.25
3 500.0 4.32 0.0
3 630.0 4.32 0.0
3 800.0 4.32 0.0
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 0.0
3 2500.0 4.32 0.0
3 3150.0 4.32 0.0
3 4000.0 4.32 0.0
3 5000.0 4.32 0.0
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 0.25
3 16000.0 4.32 0.5
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

Hedd Type 20 MK2: comparison between EQs
Hedd Type 20 MK2

Comparison betweens various EQs

Hedd Type 20 MK2

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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