The OBP-3 is Aguilar’s most flexible onboard preamp design. 

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• The OBP-3 preamp provides +/-18dB of cut and boost at 40Hz, +/- 16dB of cut and boost at either 400Hz or 800Hz and +/- 16dB of treble cut and boost at 6.5 kHz. The OBP-3 has multiple wiring options, and can be wired with either a push/pull pot OR mini-toggle for midrange frequency selection.
  
  Black round switches included with configurations requiring switches.
  
  The OBP-3 Standard Kits include the preamp module and EQ pots (and switch when specified) only.  To find a more complete kit, with the option to have it prewired, check out the OBP-3 Bass Preamp Custom Kits.
  
  **Sorry international bassists, but US Dealers are not authorized to ship Aguilar Standard OBP Kits outside of the US.  Please contact us if you are having trouble finding Aguilar products in your home country.
• Configurations Offered:
  
  OBP-3TK
  Treble -- Mid w/Switch -- Bass
  
  OBP-3TK/PP
  Treble -- Push-Pull Mid -- Bass
  
  OBP-3SK
  Mid w/Switch -- Treble/Bass Stack
  
  OBP-3SK/PP
  Push-Pull Mid -- Treble/Bass Stack
  
  

• Bass control: plus/minus 18 dB @ 40 Hz

  Mid control: plus/minus 16 dB @ 400Hz or 800 Hz. User selectable frequency center

  Treble control: plus/minus 16 dB @ 6.5 KHz

  Input impedance: 1 meg ohm

  Output impedance: 100 ohm 9 or 18 volts operation

  Distortion: .019 into 10k ohm load

  Noise: -95 dBm unweighted

  Battery life: 324 hours

  Wire lead length: 6.50 inches

  Low noise discrete FET input stage, center detent 50 K linear pots,with a dual concentric pot available

  Dimensions: 0.98″W x 0.98″L x 0.59″D

  Warranty: Three year limited warranty

  
  WIRING DIAGRAM:
  
  Aguilar's general OBP-3 wiring diagram
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• Below are impressions and anecdotal thoughts gathered over the years. Some are our own and some are from customers.

  • Clean & clear
  • Flexible configurations
  • Well loved mid frequency options
    
  • "Gave my bass some ballz"
    
  • Often seen as one of the more 'powerful' preamps