What we know about the measurement:

Miller & Kreisel IW150 is a passive inwall that cost around 2000 USD each.

  • Quality of the measurement data is high.
  • Origin of the data is ErinsAudioCorner.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 89.4dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 95.2Hz (resp. 82.0Hz).
  • 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 (-20.0°, 50.0°) 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
    • Note: The tonality (Preference) score does not make sense for inwall speakers. Don't give too much credits to the value.
    • Tonality (Preference) Score is 3.27 and would be 6.52 with a perfect subwoofer.
      • Details: NBD: ON 0.463, LW 0.389, SP 0.473, PIR 0.414; SM: SP0.661, PIR0.53; LFQ 0.06, LFX 82Hz
    • Tonality (Preference) Score is 5.67 with an EQ and would be 8.66 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.227, LW 0.17, SP 0.247, PIR 0.192; SM: SP0.925, PIR0.916; LFQ 0.06, LFX 71Hz
  • Link to Original review.
Miller & Kreisel IW150
AutomaticEQ (IIR)
Set preamp gain to: -1.8dB.
Type Freq Q Gain
3 88.0 1.76 3.0
3 134.0 2.12 -4.99
3 190.0 1.82 -1.58
3 1381.0 2.78 1.18
3 2862.0 2.98 1.53
3 3912.0 1.06 -1.98
3 9001.0 0.68 -3.65
Download

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

Miller & Kreisel IW150 filters_auto_eq

AutomaticEQ

Miller & Kreisel IW150 filters_eq_full

Target v.s. EQ

Miller & Kreisel IW150
Graphic EQ 15 bands
Set preamp gain to: -0.3dB.
Type Freq Q Gain
3 25.0 2.14 0.25
3 40.0 2.14 0.25
3 63.0 2.14 0.25
3 100.0 2.14 0.0
3 160.0 2.14 -0.75
3 250.0 2.14 -0.25
3 400.0 2.14 -0.25
3 630.0 2.14 -0.25
3 1000.0 2.14 0.0
3 1600.0 2.14 0.25
3 2500.0 2.14 0.0
3 4000.0 2.14 -0.25
3 6300.0 2.14 -0.5
3 10000.0 2.14 -0.5
3 16000.0 2.14 -0.25
Download

These EQ is designed for a 15 bands graphical EQ.

Miller & Kreisel IW150
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 0.25
3 100.0 4.32 0.0
3 125.0 4.32 -0.5
3 160.0 4.32 -0.5
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 -0.25
3 800.0 4.32 -0.25
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 0.0
3 3150.0 4.32 0.0
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 -0.25
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.

Miller & Kreisel IW150: comparison between EQs
Miller & Kreisel IW150

Comparison betweens various EQs

Miller & Kreisel IW150

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
;