What we know about the measurement:

Ascend Acoustics Sierra 1 V2 is a passive bookshelves that cost around 1000 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is Ascend Acoustics.
  • Format of the data is a set of 36 horizontal and 36 vertical measurements .
  • Sensitivity: 81.2dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 53.0Hz (resp. 45.0Hz).
  • Reference level is normalised to -0.4dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.7dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-80.0°, 80.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-20.0°, 10.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 6.7 and would be 8.65 with a perfect subwoofer.
      • Details: NBD: ON 0.309, LW 0.22, SP 0.21, PIR 0.17; SM: SP0.985, PIR0.97; LFQ 0.524, LFX 41Hz
    • Tonality (Preference) Score is 7.04 with an EQ and would be 8.82 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.249, LW 0.181, SP 0.22, PIR 0.161; SM: SP0.957, PIR0.965; LFQ 0.524, LFX 37Hz
  • Link to original Review: eac review. Links to other reviews: yt review , history review , asr review .
  • Vendor specifications:
    • Sensitivity 87 dB
    • Impedance 8 Ohm
    • Size
      • Width 190mm
      • Height 362mm
      • Depth 267 mm)
    • Weight 8.4 kg
Ascend Acoustics Sierra 1 V2
AutomaticEQ (IIR)
Set preamp gain to: -2.8dB.
Type Freq Q Gain
3 41.0 0.78 2.98
3 83.0 1.66 -1.56
3 211.0 1.58 0.9
3 289.0 2.9 0.59
3 1244.0 2.23 -0.68
3 3405.0 2.21 1.2
3 5536.0 2.26 0.81
Download

These EQ optimise the Harman score and is a good start for far field listening like in your living room.

Ascend Acoustics Sierra 1 V2 filters_auto_eq

AutomaticEQ

Ascend Acoustics Sierra 1 V2 filters_eq_full

Target v.s. 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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