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Official effect

Broken Speaker Drive

Two-stage clipped drive with a narrow band-pass bottleneck that mimics a constricted, damaged speaker voice.

After the usual pre-drive shaping, this signal path runs through one tanh stage, a narrow band-pass centered by `tone`, and then a second tanh stage before the final high shelf. That mid-focused bottleneck strips away bandwidth between clipping stages, which is what gives the current preview its broken-speaker feel.

  • Drive, Boost & Saturation
  • Library #25
  • Preview 8s

Waveform preview

Static peaks come from the compiled FAUST preview render. The live scope is drawn from the browser playback output in real time.

Timeline
0:00 / 0:08
Source
Compiled browser preview
Live oscilloscope from the browser playback output.AnalyserNode keeps the signal path unchanged while exposing the waveform.

How It Works

Technical view

After the usual pre-drive shaping, this signal path runs through one tanh stage, a narrow band-pass centered by `tone`, and then a second tanh stage before the final high shelf. That mid-focused bottleneck strips away bandwidth between clipping stages, which is what gives the current preview its broken-speaker feel.

  • Drive, Boost & Saturation
  • band-pass filtering
  • waveshaping / saturation
  • delay processing
  • oscillator / LFO modulation
  • DC blocking

Signal Path

Compiled preview chain

Preview source: An internally generated picked-string phrase is widened to stereo with a 19-sample right-channel delay and slight left/right shelf-EQ offsets before it reaches the active drive path.

  1. 1internal picked-string demo phrase
  2. 2stereo spread with a short right-channel delay
  3. 3high-pass cleanup
  4. 4low-shelf and 930 Hz contour shaping
  5. 5first tanh clipping stage
  6. 6inter-stage band-pass filter
  7. 7second tanh clipping stage
  8. 8post-drive high-shelf tone shaping
  9. 9dry / wet mix
  10. 10DC blocker
  11. 11output gain trim
  12. 12final tanh limiter

Preview source

An internally generated picked-string phrase is widened to stereo with a 19-sample right-channel delay and slight left/right shelf-EQ offsets before it reaches the active drive path.

Effect core

Two-stage clipped drive with an inter-stage band-pass choke for a narrowed speaker-like voice.

Signal path

The static waveform and the live player both reflect this compiled signal chain.

  • internal picked-string demo phrase
  • stereo spread with a short right-channel delay
  • high-pass cleanup
  • low-shelf and 930 Hz contour shaping
  • first tanh clipping stage
  • inter-stage band-pass filter
  • second tanh clipping stage
  • post-drive high-shelf tone shaping
  • dry / wet mix
  • DC blocker
  • output gain trim
  • final tanh limiter

Controls that matter

These are the currently active controls detected in the FAUST source for this effect.

  • mix: Blends the clean stereo preview source with the dual-stage clipped distortion path.
  • output_gain_db: Trims the final level after DC blocking and before the limiter.
  • drive: Raises the level feeding both clipping stages, with the second stage also hit after the band-pass choke.
  • tone: Moves the center of the inter-stage band-pass while still affecting the post-drive high shelf.
  • contour: Adjusts the low shelf and restrained 930 Hz push ahead of clipping.

Code-backed analysis

The generated description is tied to the active helper blocks and routing found in the current DSP.

  • demo
  • fx
  • outputStage
  • leftDemo
  • rightDemo
  • driveTone
  • phraseMono
  • previewShiftSamples

Controls

Audible controls in this DSP

  • mix

    Active

    Blends the clean stereo preview source with the dual-stage clipped distortion path.

    Lower settings keep more dry pick detail; higher settings commit to the denser distortion voice.

  • output_gain_db

    Active

    Trims the final level after DC blocking and before the limiter.

    Sets loudness without changing how hard the internal clipping stages are hit.

  • drive

    Active

    Raises the level feeding both clipping stages, with the second stage also hit after the band-pass choke.

    Adds more grind and compression across both distortion stages.

  • tone

    Active

    Moves the center of the inter-stage band-pass while still affecting the post-drive high shelf.

    Shifts the broken-speaker bottleneck up or down while also changing the final brightness.

  • contour

    Active

    Adjusts the low shelf and restrained 930 Hz push ahead of clipping.

    Changes how much weight and upper-mid focus gets driven into the distortion core.

Analysis

Code-derived notes

Reviewed against the current DSP. This is one of the more genuinely differentiated drive files because it inserts a narrow band-pass between the two clipping stages.

Active blocks

  • demo
  • fx
  • outputStage
  • leftDemo
  • rightDemo
  • driveTone
  • phraseMono
  • previewShiftSamples
  • softsat
  • pickedVoice
  • fund
  • pickEnv
  • ampEnv
  • triggerAt
  • maxDelaySamples

Inactive helpers

  • synthVoice
  • organVoice
  • bellVoice
  • quantize
  • combLP
  • echoOnly
  • diffuser

Warnings

No current warnings are attached to this effect.

Source

  • library/drive-boost-saturation/broken-speaker-drive.dsp
  • Output stage: DC blocker -> output gain trim -> final tanh limiter
  • Library position: 25

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Each effect page uses the same generated description pipeline and compiled waveform preview assets.

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