What we know about the measurement:

Klipsch RP-404C II is a passive center that cost around 600 USD

  • Quality of the measurement data is high.
  • Origin of the data is ErinsAudioCorner.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 86.4dB (avg. 100Hz-1kHz for 2.83V measured at 1m).
  • -3dB (resp. -6db) point v.s. reference is at 124.5Hz (resp. 98.1Hz).
  • Reference level is normalised to 0.2dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 3.5dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-50.0°, 50.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-20.0°, 20.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 1.97 and would be 5.61 with a perfect subwoofer.
      • Details: NBD: ON 0.464, LW 0.405, SP 0.357, PIR 0.328; SM: SP0.746, PIR0.028; LFQ 1.539, LFX 101Hz
    • Tonality (Preference) Score is 5.27 with an EQ and would be 8.41 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.307, LW 0.243, SP 0.288, PIR 0.232; SM: SP0.971, PIR0.944; LFQ 1.256, LFX 77Hz
  • Vertical measurement
  • Link to Original review.
Klipsch RP-404C II
AutomaticEQ (IIR)
Set preamp gain to: -3.0dB.
Type Freq Q Gain
3 88.0 1.26 3.0
3 942.0 2.05 2.88
3 1046.0 2.97 -2.43
3 2168.0 2.05 2.37
3 2324.0 3.0 -5.22
3 5347.0 1.34 -1.58
3 14633.0 0.43 -4.71
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These EQ optimise the Harman score and is a good start for far field listening like in your living room.

Klipsch RP-404C II filters_auto_eq

AutomaticEQ

Klipsch RP-404C II filters_eq_full

Target v.s. EQ

Klipsch RP-404C II
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
3 25.0 2.14 0.5
3 40.0 2.14 0.5
3 63.0 2.14 0.5
3 100.0 2.14 0.5
3 160.0 2.14 0.25
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 0.0
3 2500.0 2.14 -0.25
3 4000.0 2.14 -0.25
3 6300.0 2.14 -0.5
3 10000.0 2.14 -0.75
3 16000.0 2.14 -0.5
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These EQ is designed for a 15 bands graphical EQ.

Klipsch RP-404C II
Graphic EQ 31 bands
Set preamp gain to: -0.8dB.
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 0.5
3 160.0 4.32 0.25
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 0.25
3 1000.0 4.32 0.25
3 1250.0 4.32 0.0
3 1600.0 4.32 0.25
3 2000.0 4.32 0.0
3 2500.0 4.32 -0.25
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 -0.5
3 8000.0 4.32 -0.5
3 10000.0 4.32 -0.5
3 12000.0 4.32 -0.75
3 16000.0 4.32 -0.5
3 20000.0 4.32 0.0
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These EQ is designed for a 31 bands graphical EQ.

Klipsch RP-404C II: comparison between EQs
Klipsch RP-404C II

Comparison betweens various EQs

Klipsch RP-404C II

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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