What we know about the measurement:

MartinLogan Motion 4i is a passive bookshelves that cost around 360 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 .
  • Sensitivity: 85.9dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 159.7Hz (resp. 108.4Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.7dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-60.0°, 50.0°) 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 1.46 and would be 5.09 with a perfect subwoofer.
      • Details: NBD: ON 0.547, LW 0.551, SP 0.426, PIR 0.449; SM: SP0.583, PIR0.052; LFQ 0.258, LFX 101Hz
    • Tonality (Preference) Score is 5.2 with an EQ and would be 7.81 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.409, LW 0.417, SP 0.358, PIR 0.326; SM: SP0.949, PIR0.917; LFQ 0.23, LFX 58Hz
  • Link to Original review.
MartinLogan Motion 4i
AutomaticEQ (IIR)
Set preamp gain to: -4.8dB.
Type Freq Q Gain
5 159.0 1.16 2.95
3 159.0 2.36 -0.35
3 159.0 0.36 2.77
3 229.0 1.27 -1.68
3 1394.0 1.94 -1.87
3 1948.0 2.63 2.77
3 7669.0 2.95 -1.69
3 13997.0 1.53 -2.29
3 15474.0 1.11 -2.29
Download

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

MartinLogan Motion 4i filters_auto_eq

AutomaticEQ

MartinLogan Motion 4i filters_eq_full

Target v.s. EQ

MartinLogan Motion 4i
flipflop@ASR (IIR)
Set preamp gain to: -1.0dB.
Type Freq Q Gain
3 410.0 6.0 0.5
3 468.0 9.0 -0.4
3 573.0 4.5 -1.4
3 790.0 14.0 1.1
3 850.0 10.0 -2.9
3 1037.0 5.3 -2.0
3 1365.0 4.5 -3.1
3 1680.0 15.0 -0.4
3 1925.0 11.0 1.7
3 2105.0 13.0 -0.7
3 2287.0 15.0 0.9
3 2478.0 12.0 -2.2
3 3025.0 6.5 -2.3
3 3640.0 5.5 -1.9
3 3940.0 17.0 0.8
3 4470.0 12.0 0.6
3 5250.0 3.8 -1.8
3 7850.0 4.0 -2.6
3 9550.0 6.0 1.6
3 15540.0 0.85 -6.2
Download

These EQ is designed by ASR member flipflop.

MartinLogan Motion 4i
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 0.5
3 250.0 2.14 0.25
3 400.0 2.14 0.25
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 -0.25
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 -1.0
Download

These EQ is designed for a 15 bands graphical EQ.

MartinLogan Motion 4i
Graphic EQ 31 bands
Set preamp gain to: -0.8dB.
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 0.5
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 0.0
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 -0.25
3 1600.0 4.32 0.0
3 2000.0 4.32 0.25
3 2500.0 4.32 0.0
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 -0.25
3 8000.0 4.32 -0.75
3 10000.0 4.32 -0.5
3 12000.0 4.32 -0.75
3 16000.0 4.32 -1.0
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

MartinLogan Motion 4i: comparison between EQs
MartinLogan Motion 4i

Comparison betweens various EQs

MartinLogan Motion 4i

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
;