What we know about the measurement:

Quad Electroacoustics ESL-57 is a passive panel

  • Quality of the measurement data is low.
  • Origin of the data is Princeton.
  • Format of the data is .
  • Sensitivity: 92.8dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • Reference level is normalised to 0.4dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.5dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-10.0°, 10.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-10.0°, 10.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Note: The tonality (Preference) score does not make sense for panel speakers. Don't give too much credits to the value.
    • Tonality (Preference) Score is -2.88 and would be 3.77 with a perfect subwoofer.
      • Details: NBD: ON 0.87, LW 0.765, SP 0.688, PIR 0.658; SM: SP0.128, PIR0.099; LFQ 10.0, LFX 509Hz
    • Tonality (Preference) Score is -0.73 with an EQ and would be 5.93 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.846, LW 0.681, SP 0.59, PIR 0.536; SM: SP0.833, PIR0.847; LFQ 10.0, LFX 509Hz
  • Link to Original review.
Quad Electroacoustics ESL-57
AutomaticEQ (IIR)
Set preamp gain to: -0.1dB.
Type Freq Q Gain
3 22.0 0.38 -8.61
3 29.0 0.27 -8.88
3 34.0 0.43 -8.86
3 47.0 0.27 -8.71
3 1288.0 1.12 -2.16
3 2670.0 1.18 1.08
3 13186.0 0.68 -6.85
Download

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

Quad Electroacoustics ESL-57 filters_auto_eq

AutomaticEQ

Quad Electroacoustics ESL-57 filters_eq_full

Target v.s. EQ

Quad Electroacoustics ESL-57
Graphic EQ 15 bands
Set preamp gain to: -1.4dB.
Type Freq Q Gain
3 25.0 2.14 0.0
3 40.0 2.14 0.0
3 63.0 2.14 0.0
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 0.5
3 1000.0 2.14 0.5
3 1600.0 2.14 0.5
3 2500.0 2.14 1.0
3 4000.0 2.14 1.0
3 6300.0 2.14 1.0
3 10000.0 2.14 0.75
3 16000.0 2.14 0.5
Download

These EQ is designed for a 15 bands graphical EQ.

Quad Electroacoustics ESL-57
Graphic EQ 31 bands
Set preamp gain to: -1.4dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.0
3 31.0 4.32 0.0
3 40.0 4.32 0.0
3 50.0 4.32 0.0
3 63.0 4.32 0.0
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 0.5
3 800.0 4.32 0.5
3 1000.0 4.32 0.5
3 1250.0 4.32 0.5
3 1600.0 4.32 0.5
3 2000.0 4.32 0.5
3 2500.0 4.32 0.75
3 3150.0 4.32 1.0
3 4000.0 4.32 0.75
3 5000.0 4.32 1.0
3 6300.0 4.32 0.75
3 8000.0 4.32 0.5
3 10000.0 4.32 0.5
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.

Quad Electroacoustics ESL-57: comparison between EQs
Quad Electroacoustics ESL-57

Comparison betweens various EQs

Quad Electroacoustics ESL-57

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
;