What we know about the measurement:

Topping MA4 is an active bookshelves that cost around 800 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is Topping.
  • Format of the data is generated by a Klippel NFS .
  • -3dB (resp. -6db) point v.s. reference is at 49.8Hz (resp. 46.9Hz).
  • Reference level is normalised to 0.1dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 1.6dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 5.88 and would be 8.07 with a perfect subwoofer.
      • Details: NBD: ON 0.316, LW 0.306, SP 0.343, PIR 0.308; SM: SP0.946, PIR0.907; LFQ 0.452, LFX 46Hz
    • Tonality (Preference) Score is 6.76 with an EQ and would be 8.83 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.201, LW 0.195, SP 0.246, PIR 0.189; SM: SP0.971, PIR0.958; LFQ 0.452, LFX 43Hz
  • Link to original Review: asr review. .
  • Note: origin measurement done by a Klippel NFS.
  • Vendor specifications:
    • SPL
      • peak: 105 dB
    • Size
      • Width 140mm
      • Height 255mm
      • Depth 288mm
    • Weight 3.78kg
Topping MA4
AutomaticEQ (IIR)
Set preamp gain to: -1.3dB.
Type Freq Q Gain
PK 60.0 0.48 1.58
PK 155.0 1.25 -1.53
PK 270.0 0.54 -1.1
PK 579.0 2.07 1.75
PK 714.0 2.22 -2.05
PK 1532.0 0.59 0.85
PK 3177.0 1.83 -1.69
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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