What we know about the measurement:

Jeff Bagby Mandolin DIY is a passive bookshelves that cost around 300 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: 82.7dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 55.7Hz (resp. 46.9Hz).
  • Reference level is normalised to -0.0dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.5dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-70.0°, 70.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-20.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 5.34 and would be 7.41 with a perfect subwoofer.
      • Details: NBD: ON 0.454, LW 0.337, SP 0.404, PIR 0.331; SM: SP0.872, PIR0.799; LFQ 0.576, LFX 43Hz
    • Tonality (Preference) Score is 6.72 with an EQ and would be 8.45 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.303, LW 0.249, SP 0.319, PIR 0.231; SM: SP0.951, PIR0.957; LFQ 0.576, LFX 36Hz
  • Link to Original review.
Jeff Bagby Mandolin DIY
AutomaticEQ (IIR)
Set preamp gain to: -2.7dB.
Type Freq Q Gain
3 37.0 0.83 3.0
3 95.0 1.29 -3.09
3 227.0 1.59 1.09
3 344.0 2.99 1.66
3 2491.0 1.48 -2.28
3 2862.0 2.71 2.4
3 4654.0 2.64 -2.25
Download

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

Jeff Bagby Mandolin DIY filters_auto_eq

AutomaticEQ

Jeff Bagby Mandolin DIY filters_eq_full

Target v.s. EQ

Jeff Bagby Mandolin DIY
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 0.25
3 63.0 2.14 0.0
3 100.0 2.14 -0.5
3 160.0 2.14 -0.25
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 -0.25
3 4000.0 2.14 -0.25
3 6300.0 2.14 0.0
3 10000.0 2.14 0.25
3 16000.0 2.14 0.5
Download

These EQ is designed for a 15 bands graphical EQ.

Jeff Bagby Mandolin DIY
Graphic EQ 31 bands
Set preamp gain to: -1.0dB.
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 0.0
3 80.0 4.32 -0.5
3 100.0 4.32 -0.5
3 125.0 4.32 -0.25
3 160.0 4.32 0.0
3 200.0 4.32 0.0
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 0.0
3 1000.0 4.32 0.0
3 1250.0 4.32 0.0
3 1600.0 4.32 0.25
3 2000.0 4.32 0.0
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 0.0
3 6300.0 4.32 0.25
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 1.0
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

Jeff Bagby Mandolin DIY: comparison between EQs
Jeff Bagby Mandolin DIY

Comparison betweens various EQs

Jeff Bagby Mandolin 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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