What we know about the measurement:

MTG Designs AlTi DIY is a passive bookshelves

  • Quality of the measurement data is low.
  • Origin of the data is Misc.
  • Format of the data is a set of 36 horizontal and 36 vertical measurements .
  • Sensitivity: 83.8dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 65.4Hz (resp. 48.3Hz).
  • Reference level is normalised to -0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 1.4dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-70.0°, 70.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-30.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 6.3 and would be 8.5 with a perfect subwoofer.
      • Details: NBD: ON 0.235, LW 0.179, SP 0.283, PIR 0.201; SM: SP0.89, PIR0.865; LFQ 0.384, LFX 46Hz
    • Tonality (Preference) Score is 7.01 with an EQ and would be 8.93 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.197, LW 0.17, SP 0.25, PIR 0.163; SM: SP0.952, PIR0.962; LFQ 0.384, LFX 40Hz
  • Link to Original review.
MTG Designs AlTi DIY
AutomaticEQ (IIR)
Set preamp gain to: -4.1dB.
Type Freq Q Gain
3 40.0 1.53 2.85
3 67.0 0.87 2.35
3 105.0 0.87 -0.32
3 252.0 1.37 -0.44
3 1010.0 2.96 0.49
3 2579.0 1.53 0.47
3 4654.0 1.02 -1.24
Download

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

MTG Designs AlTi DIY filters_auto_eq

AutomaticEQ

MTG Designs AlTi DIY filters_eq_full

Target v.s. EQ

MTG Designs AlTi DIY
Graphic EQ 15 bands
Set preamp gain to: -1.0dB.
Type Freq Q Gain
3 25.0 2.14 0.75
3 40.0 2.14 0.75
3 63.0 2.14 0.75
3 100.0 2.14 0.25
3 160.0 2.14 0.0
3 250.0 2.14 -0.25
3 400.0 2.14 0.0
3 630.0 2.14 0.25
3 1000.0 2.14 0.25
3 1600.0 2.14 0.0
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 0.0
3 16000.0 2.14 0.0
Download

These EQ is designed for a 15 bands graphical EQ.

MTG Designs AlTi DIY
Graphic EQ 31 bands
Set preamp gain to: -1.1dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.75
3 31.0 4.32 0.75
3 40.0 4.32 0.75
3 50.0 4.32 0.75
3 63.0 4.32 0.75
3 80.0 4.32 0.5
3 100.0 4.32 0.25
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 -0.25
3 315.0 4.32 -0.25
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 0.25
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 -0.25
3 5000.0 4.32 -0.25
3 6300.0 4.32 -0.25
3 8000.0 4.32 0.0
3 10000.0 4.32 0.0
3 12000.0 4.32 0.0
3 16000.0 4.32 0.0
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

MTG Designs AlTi DIY: comparison between EQs
MTG Designs AlTi DIY

Comparison betweens various EQs

MTG Designs AlTi DIY

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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