Seymour Duncan's SFX-09 Double Back Compressor is a stompbox that won't get in the way of your unique sound. Simply put, a compressor makes quiet passages louder and loud passages quieter, making your sound more "professional" by providing smooth dynamics and enhanced sustain. Most other compressors, however, can get in the way of your guitar's natural transients and feel—but not the Double Back. This feature, which gives this compression pedal its name, allows some of the uncompressed sound—specifically the initial "snap" of the string—to "double back" into the compressor output, thus preserving the essential essence and sensation of a guitar string being plucked. And it's extremely quiet.
Compression Ratio: Adjustable from 1:1 to 20:1
Maximum Compressor Gain: +50dB
Attack Speed: Adjustable from 3.2ms to 23ms
Double Back Gain: From fully off to +34dB
Battery Life: 100 hours with a premium alkaline battery
Power Source: 9V battery or external 9VDC regulated wall transformer, center pin negative. 5mA current drain
Input Impedance: 1 Megohm (1000 kOhm)
Output Impedance: 2.75 kOhms maximum
Output Clipping Level: 7V Peak-to-Peak
Distortion: Less than 0.3% at 300mV RMS output at 1 kHz
Noise referred to Input: -102dBV unweighted, 400Hz 20kHz, input shorted
Type of Circuitry: True bypass, class A
Compressor type: Voltage Controlled Amplifier (VCA)
Dimensions: 4-3/4" W x 5" L x 2-3/10" H
Weight 1.5 lbs.
Chassis material: 16 Gauge Steel
