Maxon AF-9 Auto Filter
Originally introduced as a key component of analog synthesizers, envelope controlled filters came into prominence in the early 1970s with the release of the legendary Mutron III. Envelope filters are wah-wah type sliding filters that are triggered by an input voltage. 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 Ð 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.
|Input Impedance:||500K ohm|
|Input Jack:||1/4 inch standard phone jack|
|Output Impedance:||10k Ohm|
|Output Jack:||1/4 inch standard phone jack|
|Residual Noise:||-95 dB or less (input shorted IHF-A weighted)|
|Filter Frequency||100 Hz 2 KHz (Low) / 200 Hz 4 KHz (High)|
|Switch:||Normal/Effect (true bypass configuration), Filter LP/BP/HP, Drive Up/Down, Range High/Low|
|Power Supply:||6F22 9V Manganese dry cell battery x1 or Maxon AC adaptor|
|Power Voltage||DC9 V (Battery) / DC10 V (AC-adaptor)|
|Current Consumption||17 mA (9 V) / 19 mA (10 V)|
(NOT INCLUDED) :
|AC210N (option) Input: AC120V Output: DC9V/200 mA Center - / Sleeve +)|
|Dimensions:||2.9" (W) x 4.9" (D) x 2.1" (H) -
74 mm (W) x 124 mm (D) x 54 mm (H)
|Weight (with battery):||20.5 oz (580 grams)|
|Accessories:||9V Manganese dry cell battery, User's Manual, Warranty Card|
Specifications subject to change without notice.