What we know about the measurement:

Ascend Acoustics Sierra Duo V2 LCR Ribbon is a passive bookshelves that cost around 1688 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 .
  • -3dB (resp. -6db) point v.s. reference is at 79.1Hz (resp. 64.5Hz).
  • Reference level is normalised to -0.3dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 2.6dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 4.88 and would be 7.5 with a perfect subwoofer.
      • Details: NBD: ON 0.422, LW 0.41, SP 0.437, PIR 0.372; SM: SP0.876, PIR0.855; LFQ 0.913, LFX 58Hz
    • Tonality (Preference) Score is 6.16 with an EQ and would be 8.36 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.293, LW 0.288, SP 0.346, PIR 0.259; SM: SP0.939, PIR0.941; LFQ 0.821, LFX 46Hz
  • Vendor specifications:
    • Sensitivity 86.0 dB
    • Impedance 8 Ohm
    • Size
      • Width 146mm
      • Height 412mm
      • Depth 152mm
    • Weight 5.4kg
Ascend Acoustics Sierra Duo V2 LCR Ribbon
AutomaticEQ (IIR)
Set preamp gain to: -2.7dB.
Type Freq Q Gain
PK 54.0 0.26 3.0
PK 113.0 2.16 -2.53
PK 149.0 1.49 -2.9
PK 820.0 2.72 2.49
PK 1161.0 0.53 -1.6
PK 1954.0 1.46 1.65
PK 12736.0 0.49 -0.85
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These EQ optimise the Harman score and is a good start for far field listening like in your living room.

Ascend Acoustics Sierra Duo V2 LCR Ribbon filters_auto_eq

AutomaticEQ

Ascend Acoustics Sierra Duo V2 LCR Ribbon filters_eq_full

Target v.s. EQ
CEA2034
CEA2034 Normalized
On Axis
Early Reflections
Estimated In-Room Response
Horizontal Reflections
Vertical Reflections
SPL Horizontal
SPL Vertical
SPL Horizontal Normalized
SPL Vertical Normalized
SPL Horizontal Contour
SPL Vertical Contour
SPL Horizontal Contour Normalized
SPL Vertical Contour Normalized
SPL Horizontal Contour 3D
SPL Vertical Contour 3D
SPL Horizontal Contour Normalized 3D
SPL Vertical Contour Normalized 3D
SPL Horizontal Radar
SPL Vertical Radar
CEA2034
CEA2034 Normalized
On Axis
Early Reflections
Estimated In-Room Response
Horizontal Reflections
Vertical Reflections
SPL Horizontal
SPL Vertical
SPL Horizontal Normalized
SPL Vertical Normalized
SPL Horizontal Contour
SPL Vertical Contour
SPL Horizontal Contour Normalized
SPL Vertical Contour Normalized
SPL Horizontal Contour 3D
SPL Vertical Contour 3D
SPL Horizontal Contour Normalized 3D
SPL Vertical Contour Normalized 3D
SPL Horizontal Radar
SPL Vertical Radar
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
Frequency Frequency with EQ
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