What we know about the measurement:

Definitive Technology D9 is a passive bookshelves

  • Quality of the measurement data is low.
  • Origin of the data is Misc.
  • Format of the data is a scanned image .
  • Sensitivity: 77.3dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 51.6Hz (resp. 48.5Hz).
  • Reference level is normalised to 0.5dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.7dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 4.0 and would be 6.23 with a perfect subwoofer.
      • Details: NBD: ON 0.517, LW 0.407, SP 0.47, PIR 0.435; SM: SP0.761, PIR0.493; LFQ 0.261, LFX 47Hz
    • Tonality (Preference) Score is 5.86 with an EQ and would be 8.0 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.362, LW 0.311, SP 0.366, PIR 0.303; SM: SP0.948, PIR0.919; LFQ 0.261, LFX 45Hz
  • Link to original Review: asr review. .
Definitive Technology D9
AutomaticEQ (IIR)
Set preamp gain to: -2.6dB.
Type Freq Q Gain
3 34.0 0.57 2.84
3 134.0 0.9 -2.92
3 260.0 2.98 0.98
3 739.0 3.0 -2.09
3 4654.0 2.93 -3.14
3 7834.0 1.16 -1.7
3 16239.0 0.7 -5.63
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These EQ optimise the Harman score and is a good start for far field listening like in your living room.

Definitive Technology D9 filters_auto_eq

AutomaticEQ

Definitive Technology D9 filters_eq_full

Target v.s. EQ

Definitive Technology D9
Graphic EQ 15 bands
Set preamp gain to: -0.3dB.
Type Freq Q Gain
3 25.0 2.14 0.0
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 0.0
3 630.0 2.14 0.0
3 1000.0 2.14 0.0
3 1600.0 2.14 0.25
3 2500.0 2.14 0.25
3 4000.0 2.14 -0.25
3 6300.0 2.14 -0.25
3 10000.0 2.14 -0.5
3 16000.0 2.14 -0.5
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These EQ is designed for a 15 bands graphical EQ.

Definitive Technology D9
Graphic EQ 31 bands
Set preamp gain to: -0.2dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.0
3 31.0 4.32 0.0
3 40.0 4.32 0.0
3 50.0 4.32 0.0
3 63.0 4.32 0.0
3 80.0 4.32 0.0
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 0.0
3 250.0 4.32 0.0
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 0.0
3 1000.0 4.32 0.0
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 0.25
3 3150.0 4.32 0.0
3 4000.0 4.32 -0.25
3 5000.0 4.32 -0.5
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 -0.5
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

Definitive Technology D9: comparison between EQs
Definitive Technology D9

Comparison betweens various EQs

Definitive Technology D9

Improvements made by EQ

Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
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