What we know about the measurement:

Gradient Helsinki 1.5 is a passive floorstanders

  • Quality of the measurement data is low.
  • Origin of the data is Princeton.
  • Format of the data is .
  • Link to Original review.
Gradient Helsinki 1.5
AutomaticEQ (IIR)
Set preamp gain to: -2.3dB.
Type Freq Q Gain
PK 32.0 0.69 -7.83
PK 52.0 0.49 -8.15
PK 72.0 0.58 -7.79
PK 439.0 2.85 -3.11
PK 2964.0 0.34 -3.59
PK 8397.0 1.31 0.84
PK 12736.0 0.29 2.73
Download

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

Gradient Helsinki 1.5 filters_auto_eq

AutomaticEQ

Gradient Helsinki 1.5 filters_eq_full

Target v.s. EQ

Gradient Helsinki 1.5
Graphic EQ 15 bands
Set preamp gain to: -0.6dB.
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 0.25
PK 2500.0 2.14 -0.25
PK 4000.0 2.14 0.0
PK 6300.0 2.14 0.0
PK 10000.0 2.14 0.25
PK 16000.0 2.14 0.5
Download

These EQ is designed for a 15 bands graphical EQ.

Gradient Helsinki 1.5
Graphic EQ 31 bands
Set preamp gain to: -0.4dB.
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 0.25
PK 800.0 4.32 0.25
PK 1000.0 4.32 0.25
PK 1250.0 4.32 0.25
PK 1600.0 4.32 0.0
PK 2000.0 4.32 0.0
PK 2500.0 4.32 0.0
PK 3150.0 4.32 0.0
PK 4000.0 4.32 0.0
PK 5000.0 4.32 0.0
PK 6300.0 4.32 0.0
PK 8000.0 4.32 0.0
PK 10000.0 4.32 0.0
PK 12000.0 4.32 0.25
PK 16000.0 4.32 0.25
PK 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

Gradient Helsinki 1.5: comparison between EQs
Gradient Helsinki 1.5

Comparison betweens various EQs

Gradient Helsinki 1.5

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
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