What we know about the measurement:

Rockville SPG88 is an active bookshelves that cost around 130 USD for a pair.

  • Quality of the measurement data is low.
  • Origin of the data is Misc.
  • Format of the data is .
  • -3dB (resp. -6db) point v.s. reference is at 111.5Hz (resp. 95.1Hz).
  • Reference level is normalised to 0.3dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 6.1dB over the same frequency range.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is -1.47 and would be 2.18 with a perfect subwoofer.
      • Details: NBD: ON 1.124, LW 0.947, SP 0.895, PIR 0.903; SM: SP0.255, PIR0.001; LFQ 1.717, LFX 102Hz
    • Tonality (Preference) Score is 2.51 with an EQ and would be 5.79 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.788, LW 0.658, SP 0.641, PIR 0.613; SM: SP0.918, PIR0.822; LFQ 1.472, LFX 83Hz
  • Link to Original review.
Rockville SPG88
AutomaticEQ (IIR)
Set preamp gain to: -3.4dB.
Type Freq Q Gain
3 98.0 2.97 3.0
3 235.0 2.41 2.79
3 356.0 2.27 2.01
3 739.0 3.0 -3.81
3 1381.0 0.77 3.0
3 2670.0 1.38 -5.56
3 8397.0 1.07 -8.89
Download

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

Rockville SPG88 filters_auto_eq

AutomaticEQ

Rockville SPG88 filters_eq_full

Target v.s. EQ

Rockville SPG88
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
3 25.0 2.14 0.5
3 40.0 2.14 0.5
3 63.0 2.14 0.5
3 100.0 2.14 0.5
3 160.0 2.14 0.0
3 250.0 2.14 0.5
3 400.0 2.14 0.25
3 630.0 2.14 -0.25
3 1000.0 2.14 0.5
3 1600.0 2.14 0.5
3 2500.0 2.14 -0.75
3 4000.0 2.14 -0.25
3 6300.0 2.14 -0.75
3 10000.0 2.14 -1.0
3 16000.0 2.14 0.5
Download

These EQ is designed for a 15 bands graphical EQ.

Rockville SPG88
Graphic EQ 31 bands
Set preamp gain to: -0.4dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.25
3 31.0 4.32 0.25
3 40.0 4.32 0.25
3 50.0 4.32 0.25
3 63.0 4.32 0.25
3 80.0 4.32 0.25
3 100.0 4.32 0.25
3 125.0 4.32 0.25
3 160.0 4.32 0.0
3 200.0 4.32 0.25
3 250.0 4.32 0.25
3 315.0 4.32 0.25
3 400.0 4.32 0.25
3 500.0 4.32 0.0
3 630.0 4.32 -0.25
3 800.0 4.32 -0.25
3 1000.0 4.32 0.0
3 1250.0 4.32 0.0
3 1600.0 4.32 0.25
3 2000.0 4.32 0.0
3 2500.0 4.32 -0.5
3 3150.0 4.32 -0.5
3 4000.0 4.32 -0.25
3 5000.0 4.32 -0.5
3 6300.0 4.32 -0.5
3 8000.0 4.32 -1.0
3 10000.0 4.32 -1.0
3 12000.0 4.32 -0.25
3 16000.0 4.32 0.25
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

Rockville SPG88: comparison between EQs
Rockville SPG88

Comparison betweens various EQs

Rockville SPG88

Improvements made by EQ

Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
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