What we know about the measurement:

Polk Audio T15 is a passive bookshelves that cost around 100 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: 87.8dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 88.6Hz (resp. 74.0Hz).
  • Reference level is normalised to -2.0dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 12.5dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-10.0°, 10.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-40.0°, 40.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 0.33 and would be 3.38 with a perfect subwoofer.
      • Details: NBD: ON 1.137, LW 0.883, SP 0.619, PIR 0.719; SM: SP0.679, PIR0.295; LFQ 0.587, LFX 73Hz
    • Tonality (Preference) Score is 4.34 with an EQ and would be 6.88 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.693, LW 0.457, SP 0.386, PIR 0.353; SM: SP0.946, PIR0.856; LFQ 0.5, LFX 56Hz
  • Link to Original review.
Polk Audio T15
AutomaticEQ (IIR)
Set preamp gain to: -4.3dB.
Type Freq Q Gain
3 56.0 1.26 3.0
3 92.0 2.55 2.99
3 344.0 0.91 2.25
3 1244.0 3.0 -2.16
3 2324.0 3.0 -7.39
3 3912.0 1.35 3.0
3 9989.0 1.12 -4.91
Download

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

Polk Audio T15 filters_auto_eq

AutomaticEQ

Polk Audio T15 filters_eq_full

Target v.s. EQ

Polk Audio T15
flipflop@ASR (IIR)
Set preamp gain to: -5.6dB.
Type Freq Q Gain
3 436.0 5.0 10.3
3 440.0 5.0 -10.3
3 587.0 5.0 -2.9
3 608.0 4.171 6.0
3 648.0 5.0 -4.0
3 1044.0 3.052 -3.0
3 1192.0 5.0 12.0
3 1231.0 5.0 -12.9
3 1755.0 1.0 6.8
3 2443.0 5.0 -3.1
3 2471.0 1.0 -17.0
3 2625.0 5.0 7.2
3 3504.0 5.0 3.2
3 3725.0 1.425 8.8
3 4092.0 1.0 2.0
3 10815.0 1.01 -3.7
3 11792.0 5.0 2.0
3 13165.0 5.0 -2.7
3 14730.0 5.0 -2.7
3 15861.0 4.999 -2.1
Download

These EQ is designed by ASR member flipflop.

Polk Audio T15
Graphic EQ 15 bands
Set preamp gain to: -1.5dB.
Type Freq Q Gain
3 25.0 2.14 0.75
3 40.0 2.14 0.75
3 63.0 2.14 0.75
3 100.0 2.14 0.75
3 160.0 2.14 0.0
3 250.0 2.14 0.25
3 400.0 2.14 0.25
3 630.0 2.14 0.25
3 1000.0 2.14 0.0
3 1600.0 2.14 -0.25
3 2500.0 2.14 -0.75
3 4000.0 2.14 1.5
3 6300.0 2.14 0.5
3 10000.0 2.14 0.0
3 16000.0 2.14 0.0
Download

These EQ is designed for a 15 bands graphical EQ.

Polk Audio T15
Graphic EQ 31 bands
Set preamp gain to: -1.2dB.
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 0.5
3 80.0 4.32 0.5
3 100.0 4.32 0.5
3 125.0 4.32 0.25
3 160.0 4.32 0.0
3 200.0 4.32 0.25
3 250.0 4.32 0.25
3 315.0 4.32 0.25
3 400.0 4.32 0.25
3 500.0 4.32 0.25
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 0.0
3 2000.0 4.32 -0.5
3 2500.0 4.32 -0.5
3 3150.0 4.32 0.5
3 4000.0 4.32 1.0
3 5000.0 4.32 0.5
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 0.0
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

Polk Audio T15: comparison between EQs
Polk Audio T15

Comparison betweens various EQs

Polk Audio T15

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
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