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 .
  • Sensitivity:
    • Company: 86.0 dB
    • Measured: 85.3 dB (avg. 300Hz-3kHz for 2.83V measured at 1m).
  • -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
Ascend Acoustics Sierra Duo V2 LCR Ribbon

Vendor specifications

  • Impedance 8 Ohm
  • Size
    • Width 146mm
    • Height 412mm
    • Depth 152mm
  • Weight 5.4kg

Directivity (-6dB)

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