Pigtronix Bob Weir's Real Deal Acoustic Preamp BWP

Pigtronix

BWP

Bob Weir and long-time Grateful Dead tech guru and Weir’s personal Front of House engineer, Mike McGinn, developed the principle behind the Real Deal in an effort to crank Bob’s acoustic guitar loud enough in the live mix while retaining the natural, unplugged sound of the instrument. The technology they developed to achieve this goal involves using a pair of complimentary filters to split the acoustic guitar signal into low and high frequency bands, with independent preamp gain applied to each signal path. A mastering stage then combines the various inputs into a single mono output, resulting in a powerful world-class acoustic guitar tone. Bob Weir challenged Pigtronix to design a pedal to perform this unique type of processing using a low-noise, all-analog circuit, to deliver the ultimate live acoustic guitar sound. The engineering challenge involved with developing this pedal to create a realistic and amplified acoustic guitar sound in this way is no joke! First, the cutoff points of the two filters would need to be precisely matched and calibrated to avoid undesirable dips or bumps in the frequency response at the pedal’s output. Second, in order to optimize the acoustic sound from venue to venue and for each different guitar, the cutoff point where the two filters overlap also would need to be variable across a huge frequency range. As a solution, Pigtronix created a totally unique tracking filter. It allows the musician to adjust the cutoff point of both filters with a single knob, sweeping over a full decade of frequency range from 300 Hz to 3 kHz. This analog filter array—at the heart of the Bob Weir’s Real Deal acoustic preamp—uses Pigtronix custom-made optical components and 18VDC power to achieve the ultra-low noise and high headroom required when processing acoustic guitar.
  • Single (TS) or Dual-Source (TRS) input
  • Balanced (TRS) Input for External Mic
  • Low-noise 24db / octave optical filters
  • Crossover sweeps from 300Hz to 3kHz
  • 60db Gain on Microphone channel
  • Phantom Power & Phase Inversion
  • 18VDC Power Supply Included


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