What we know about the measurement:

Bose 301 Series IV is a passive bookshelves

  • Quality of the measurement data is unknown.
  • Origin of the data is Bose.
  • Format of the data is .
  • Sensitivity: 85.5dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 51.1Hz (resp. 40.9Hz).
  • Reference level is normalised to -2.3dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 18.4dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 1.82 and would be 3.91 with a perfect subwoofer.
      • Details: NBD: ON 1.291, LW 0.532, SP 0.49, PIR 0.456; SM: SP0.379, PIR0.348; LFQ 0.94, LFX 44Hz
    • Tonality (Preference) Score is 4.39 with an EQ and would be 5.84 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 1.23, LW 0.422, SP 0.353, PIR 0.297; SM: SP0.865, PIR0.912; LFQ 0.843, LFX 31Hz
Bose 301 Series IV
AutomaticEQ (IIR)
Set preamp gain to: -2.9dB.
Type Freq Q Gain
3 31.0 0.85 3.0
3 117.0 1.41 -3.81
3 190.0 3.0 0.46
3 395.0 2.99 1.29
3 1121.0 2.98 -2.35
3 5165.0 2.53 -3.3
3 14134.0 0.53 -4.46
Download

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

Bose 301 Series IV filters_auto_eq

AutomaticEQ

Bose 301 Series IV filters_eq_full

Target v.s. EQ

Bose 301 Series IV
Graphic EQ 15 bands
Set preamp gain to: -0.6dB.
Type Freq Q Gain
3 25.0 2.14 0.5
3 40.0 2.14 0.5
3 63.0 2.14 0.0
3 100.0 2.14 -0.5
3 160.0 2.14 -0.5
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 -0.25
3 1600.0 2.14 0.0
3 2500.0 2.14 0.0
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 -1.0
Download

These EQ is designed for a 15 bands graphical EQ.

Bose 301 Series IV
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 0.0
3 80.0 4.32 -0.25
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 0.0
3 315.0 4.32 0.0
3 400.0 4.32 0.0
3 500.0 4.32 -0.25
3 630.0 4.32 0.0
3 800.0 4.32 -0.25
3 1000.0 4.32 -0.25
3 1250.0 4.32 -0.5
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 -0.25
3 4000.0 4.32 -0.25
3 5000.0 4.32 -0.5
3 6300.0 4.32 -0.25
3 8000.0 4.32 -0.25
3 10000.0 4.32 -0.5
3 12000.0 4.32 -0.75
3 16000.0 4.32 -0.75
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

Bose 301 Series IV: comparison between EQs
Bose 301 Series IV

Comparison betweens various EQs

Bose 301 Series IV

Improvements made by EQ

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