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 .
  • Link to Original review.
Quad Electroacoustics ESL-57
AutomaticEQ (IIR)
Set preamp gain to: -0.1dB.
Type Freq Q Gain
PK 22.0 0.38 -8.61
PK 29.0 0.27 -8.88
PK 34.0 0.43 -8.86
PK 47.0 0.27 -8.71
PK 1288.0 1.12 -2.16
PK 2670.0 1.18 1.08
PK 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
PK 25.0 2.14 0.0
PK 40.0 2.14 0.0
PK 63.0 2.14 0.0
PK 100.0 2.14 0.0
PK 160.0 2.14 0.0
PK 250.0 2.14 0.0
PK 400.0 2.14 0.0
PK 630.0 2.14 0.5
PK 1000.0 2.14 0.5
PK 1600.0 2.14 0.5
PK 2500.0 2.14 1.0
PK 4000.0 2.14 1.0
PK 6300.0 2.14 1.0
PK 10000.0 2.14 0.75
PK 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
PK 20.0 4.32 0.0
PK 25.0 4.32 0.0
PK 31.0 4.32 0.0
PK 40.0 4.32 0.0
PK 50.0 4.32 0.0
PK 63.0 4.32 0.0
PK 80.0 4.32 0.0
PK 100.0 4.32 0.0
PK 125.0 4.32 0.0
PK 160.0 4.32 0.0
PK 200.0 4.32 0.0
PK 250.0 4.32 0.0
PK 315.0 4.32 0.0
PK 400.0 4.32 0.0
PK 500.0 4.32 0.0
PK 630.0 4.32 0.5
PK 800.0 4.32 0.5
PK 1000.0 4.32 0.5
PK 1250.0 4.32 0.5
PK 1600.0 4.32 0.5
PK 2000.0 4.32 0.5
PK 2500.0 4.32 0.75
PK 3150.0 4.32 1.0
PK 4000.0 4.32 0.75
PK 5000.0 4.32 1.0
PK 6300.0 4.32 0.75
PK 8000.0 4.32 0.5
PK 10000.0 4.32 0.5
PK 12000.0 4.32 0.25
PK 16000.0 4.32 0.5
PK 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
On Axis
SPL Horizontal
SPL Vertical
SPL Horizontal Normalized
SPL Vertical Normalized
SPL Horizontal Contour
SPL Vertical Contour
SPL Horizontal Contour Normalized
SPL Vertical Contour Normalized
SPL Horizontal Contour 3D
SPL Vertical Contour 3D
SPL Horizontal Contour Normalized 3D
SPL Vertical Contour Normalized 3D
SPL Horizontal Radar
SPL Vertical Radar
;