Maxon AF-9 Auto Filter

Sku #155058000000000

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AF-9 Auto Filter

Unlike standard wah pedals whose center frequency is controlled by moving a treadle, an envelope filter's center frequency is controlled by playing dynamics, allowing for an almost unlimited variety of effects based on expressive nuances in a player's performance.
The AF-9 Auto Filter represents the state-of-the art in analog filtering. Like the original Mutron III, the AF-9 uses a CdS Photocoupler (HTV #P873) rather than a VCA at the heart of its circuit. The unique sound of Photocoupler circuitry provides a liquid, shimmering, vowel-like filtering that cannot be produced with other components, giving the AF-9 superior sound quality with lower noise levels than the competition.
The AF-9's Threshold control determines when the effect will trigger, while the Peak control boosts the center frequency for more dramatic filtering (like a Resonance control on a synthesizer). Selectable Range control (Hi/Low) determines the overall tone of the AF-9, while the Drive (Up/Down) control determines the direction of the filter sweep. Three selectable Filter types (Hi Pass, Band Pass, and Low Pass) and a frequency range of 100 Hz - 4 KHz allow the AF-9 to function with virtually any instrument or input signal.
From simple wah-wah's to outer-space noises, the AF-9 provides the most desirable swept filter effects in a compact, user-friendly package.

  • The coolest aspects of auto-wah and swept filter effects
  • Opto-coupler circuitry produces vintage shimmering, watery filtering effects
  • Threshold and peak sliders control the degree of effect
  • Range and drive switches determine range and direction of filter sweeps
  • 3 selectable filter types: Lo Pass, Band Pass, and Hi Pass
  • 100Hz-4kHz range for staggering effects with any instrument or input signal
  • True bypass
  • Die-cast zinc case
  • 3-year warranty
  • AC/DC operation (order optional Maxon AC210N adapter)

Put some shimmer in your tonal arsenal. Order the AF-9 today!


AF-9 Auto Filter Specifications:

  • AC Adaptor: AC210N (option) Input: AC120V Output: DC9V/200 mA Center - / Sleeve +)
    Accessories: 9V Manganese dry cell battery (S-006P) x 1
    Controls: Sensitivity, Peak
    Current Consumption: 17 mA (9 V) / 19 mA (10 V)
    Dimensions: 74 mm (W) x 124 mm (D) x 54 mm (H)
    Frequency: 100 Hz - 2 KHz (Low) / 200 Hz - 4 KHz (High)
    Input Impedance: 500K Ohms
    Input Jack: 1/4 inch standard phone jack
    Output Jack: 1/4 inch standard phone jack
    Output Level: 10K Ohms
    Power Supply: 9V Manganese dry cell battery (6F22) or special AC adaptor
    Power Voltage: DC9 V (Battery) / DC10 V (AC-adaptor)
    Residual Noise: 95 dB or less (input shorted IHF-A weighted)
    Switch: Normal/Effect (true bypass configuration), Filter LP/BP/HP, Drive Up/Down, Range High/Low
    Weight: 580 g
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