What we know about the measurement:

Bowers & Wilkins HTM81 D4 is a passive center that cost around 9600 USD

  • Quality of the measurement data is high.
  • Origin of the data is ErinsAudioCorner.
  • Format of the data is generated by a Klippel NFS .
  • -3dB (resp. -6db) point v.s. reference is at 52.7Hz (resp. 42.5Hz).
  • Reference level is normalised to 0.7dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 4.9dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 2.9 and would be 4.75 with a perfect subwoofer.
      • Details: NBD: ON 0.643, LW 0.519, SP 0.461, PIR 0.468; SM: SP0.317, PIR0.029; LFQ 1.424, LFX 38Hz
    • Tonality (Preference) Score is 6.07 with an EQ and would be 7.57 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.529, LW 0.382, SP 0.332, PIR 0.311; SM: SP0.951, PIR0.921; LFQ 1.371, LFX 32Hz
  • Link to original Review: eac review. .
  • Vendor specifications:
    • Sensitivity 90 dB
    • Impedance 3 Ohm
    • Size
      • Width 847mm
      • Height 334mm
      • Depth 371mm
    • Weight 32.2kg
Bowers & Wilkins HTM81 D4
AutomaticEQ (IIR)
Set preamp gain to: -2.5dB.
Type Freq Q Gain
PK 29.0 2.66 2.46
PK 579.0 2.39 -2.3
PK 910.0 0.44 2.95
PK 942.0 2.98 -5.83
PK 1161.0 0.58 2.99
PK 1288.0 2.04 -5.91
PK 8110.0 0.5 -5.45
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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