What we know about the measurement:

Yamaha NS-A638 is a passive bookshelves

  • Quality of the measurement data is unknown.
  • Origin of the data is Yamaha.
  • Format of the data is .
  • -3dB (resp. -6db) point v.s. reference is at 195.8Hz (resp. 90.4Hz).
  • Reference level is normalised to 1.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 5.8dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 1.54 and would be 4.83 with a perfect subwoofer.
      • Details: NBD: ON 0.82, LW 0.684, SP 0.498, PIR 0.582; SM: SP0.814, PIR0.404; LFQ 1.605, LFX 84Hz
    • Tonality (Preference) Score is 4.65 with an EQ and would be 7.02 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.608, LW 0.49, SP 0.46, PIR 0.42; SM: SP0.949, PIR0.911; LFQ 1.391, LFX 51Hz
  • Link to Original review.
Yamaha NS-A638
AutomaticEQ (IIR)
Set preamp gain to: -4.7dB.
Type Freq Q Gain
PK 52.0 0.85 2.98
PK 197.0 0.25 2.96
PK 219.0 2.95 -1.06
PK 820.0 0.69 -3.16
PK 2579.0 2.59 2.99
PK 2964.0 2.95 -3.55
PK 4818.0 1.82 -5.62
Download
This EQ optimise the Harman score and is a good start for far field listening like in your living room.
Yamaha NS-A638
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
PK 25.0 2.14 0.5
PK 40.0 2.14 0.5
PK 63.0 2.14 0.5
PK 100.0 2.14 0.5
PK 160.0 2.14 0.5
PK 250.0 2.14 0.25
PK 400.0 2.14 0.5
PK 630.0 2.14 0.25
PK 1000.0 2.14 -0.25
PK 1600.0 2.14 0.0
PK 2500.0 2.14 0.25
PK 4000.0 2.14 -0.5
PK 6300.0 2.14 0.0
PK 10000.0 2.14 0.5
PK 16000.0 2.14 0.25
Download
This EQ is designed for a 15 bands graphical EQ.
Yamaha NS-A638
Graphic EQ 31 bands
Set preamp gain to: -0.8dB.
Type Freq Q Gain
PK 20.0 4.32 0.0
PK 25.0 4.32 0.5
PK 31.0 4.32 0.5
PK 40.0 4.32 0.5
PK 50.0 4.32 0.5
PK 63.0 4.32 0.5
PK 80.0 4.32 0.5
PK 100.0 4.32 0.5
PK 125.0 4.32 0.5
PK 160.0 4.32 0.5
PK 200.0 4.32 0.5
PK 250.0 4.32 0.5
PK 315.0 4.32 0.5
PK 400.0 4.32 0.5
PK 500.0 4.32 0.25
PK 630.0 4.32 0.5
PK 800.0 4.32 0.0
PK 1000.0 4.32 0.0
PK 1250.0 4.32 0.0
PK 1600.0 4.32 0.25
PK 2000.0 4.32 0.25
PK 2500.0 4.32 0.25
PK 3150.0 4.32 -0.25
PK 4000.0 4.32 -0.5
PK 5000.0 4.32 -0.25
PK 6300.0 4.32 0.0
PK 8000.0 4.32 0.25
PK 10000.0 4.32 0.25
PK 12000.0 4.32 0.5
PK 16000.0 4.32 0.25
PK 20000.0 4.32 0.0
Download
This EQ is designed for a 31 bands graphical EQ.
Improvement made by adding the above EQ
EQ
AutoEQ
Target v.s. EQ
Target v.s. EQ
Histogram of errors
On Axis (fullrange)
Listening Window (fullrange)
Predicted In-Room Response (fullrange)
Yamaha NS-A638: comparison between EQs
AutomaticEQ
Target v.s. EQ
Comparison betweens various EQs
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