What we know about the measurement:

Buchardt Audio S400 is a passive bookshelves that cost around 1800 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is ASR.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 86.2dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 61.5Hz (resp. 49.8Hz).
  • Reference level is normalised to -0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.8dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-50.0°, 50.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-30.0°, 10.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 5.4 and would be 7.59 with a perfect subwoofer.
      • Details: NBD: ON 0.395, LW 0.34, SP 0.381, PIR 0.319; SM: SP0.878, PIR0.798; LFQ 0.537, LFX 46Hz
    • Tonality (Preference) Score is 6.73 with an EQ and would be 8.54 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.314, LW 0.251, SP 0.271, PIR 0.199; SM: SP0.967, PIR0.964; LFQ 0.537, LFX 38Hz
  • Link to Original review.
Buchardt Audio S400
AutomaticEQ (IIR)
Set preamp gain to: -2.9dB.
Type Freq Q Gain
5 64.0 0.67 2.97
3 245.0 1.52 0.34
3 547.0 2.97 -1.17
3 646.0 2.83 2.65
3 790.0 2.37 -1.23
3 2302.0 1.84 2.93
3 3325.0 2.23 -1.54
3 9372.0 1.48 -1.44
3 13537.0 0.42 0.59
Download

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

Buchardt Audio S400 filters_auto_eq

AutomaticEQ

Buchardt Audio S400 filters_eq_full

Target v.s. EQ

Buchardt Audio S400
flipflop@ASR (IIR)
Set preamp gain to: -2.8dB.
Type Freq Q Gain
3 343.0 16.0 0.6
3 489.0 5.0 5.0
3 516.0 5.0 -11.0
3 525.0 5.0 5.2
3 573.0 25.0 -0.6
3 616.0 5.0 3.7
3 776.0 1.0 -0.8
3 915.0 10.0 -0.4
3 1146.0 5.0 1.5
3 1425.0 18.0 0.7
3 1940.0 15.0 1.4
3 2210.0 15.0 1.0
3 2324.0 5.0 1.7
3 2540.0 7.0 1.3
3 4720.0 5.0 -0.6
3 5346.0 1.53 1.5
3 6740.0 10.0 -0.5
3 8470.0 10.0 -0.9
3 10570.0 14.0 -0.4
3 16000.0 1.25 2.8
Download

These EQ is designed by ASR member flipflop.

Buchardt Audio S400
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 0.25
3 100.0 2.14 0.0
3 160.0 2.14 0.0
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 0.0
3 1600.0 2.14 0.0
3 2500.0 2.14 0.5
3 4000.0 2.14 0.0
3 6300.0 2.14 0.0
3 10000.0 2.14 -0.25
3 16000.0 2.14 0.0
Download

These EQ is designed for a 15 bands graphical EQ.

Buchardt Audio S400
Graphic EQ 31 bands
Set preamp gain to: -0.9dB.
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 0.25
3 80.0 4.32 0.0
3 100.0 4.32 0.0
3 125.0 4.32 0.0
3 160.0 4.32 0.0
3 200.0 4.32 0.0
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 0.0
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 0.25
3 1600.0 4.32 0.25
3 2000.0 4.32 0.5
3 2500.0 4.32 0.75
3 3150.0 4.32 0.25
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 0.25
3 16000.0 4.32 0.5
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

Buchardt Audio S400: comparison between EQs
Buchardt Audio S400

Comparison betweens various EQs

Buchardt Audio S400

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
;