What we know about the measurement:

Yamaha NS-18 is a passive bookshelves

  • Quality of the measurement data is low.
  • Origin of the data is Misc.
  • Format of the data is a set of 36 horizontal and 36 vertical measurements .
  • -3dB (resp. -6db) point v.s. reference is at 40.0Hz (resp. 30.4Hz).
  • Reference level is normalised to 0.3dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 16.1dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 0.26 and would be 1.56 with a perfect subwoofer.
      • Details: NBD: ON 1.522, LW 1.108, SP 0.841, PIR 0.891; SM: SP0.411, PIR0.145; LFQ 0.802, LFX 29Hz
    • Tonality (Preference) Score is 3.46 with an EQ and would be 4.14 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 1.317, LW 0.898, SP 0.634, PIR 0.69; SM: SP0.864, PIR0.778; LFQ 0.802, LFX 20Hz
  • Link to original Review: asr review. .
  • Vendor specifications:
    • Impedance 8 Ohm
    • Size
      • Width 540mm
      • Height 720mm
      • Depth 250mm
    • Weight 18.0kg
Yamaha NS-18
AutomaticEQ (IIR)
Set preamp gain to: -5.4dB.
Type Freq Q Gain
PK 20.0 2.81 3.0
PK 62.0 0.25 3.0
PK 149.0 3.0 3.0
PK 409.0 2.91 3.0
PK 1083.0 3.0 3.0
PK 3068.0 0.28 -4.35
Download
This EQ optimise the Harman score and is a good start for far field listening like in your living room.
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)
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