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Connection guide

Rolls Corporation

Salt Lake City, UT

10/23

What's in the box?

1 - Made in USA FX953

1 - 15V power supply PN PS27s

1 - This owners manual

FX953 Bad Bass Preamp

Introducing the FX953 “Bad Bass Preamp” pedal – a versatile preamplier pedal designed to repli-

cate the eects of intentionally over or under biasing a preamp to achieve specic desired sonic

results. Our extensive experience in biasing ampliers and preamps over the years has revealed

that deviating from the correct biasing circuit can yield striking changes in sound quality.

The FX953 empowers musicians to explore this creative avenue by providing a safe and con-

trolled means to manipulate bias settings without risking damage or unwanted voltage surges

to their equipment. While initially tailored for bass guitar applications, the FX953 is compatible

with any guitar, making it a valuable tool for shaping your unique sound.

SPECIFICATIONS

Connectors: Inputs: 1/4”

Outputs: Mono - XLR balanced, 1/4”

Max Output Level: +10 dBV

Max Gain: 43 dBv

Phase Shift: 0 deg. 20 Hz - 20 kHz

THD: < Well a lot..... 1000%

Switch: Active switch with true bypass.

Power: 15 VDC adapter or 9V battery

Weight: 1.8 lbs

Size: 6.75” x 4” x1.4”

The primary function of this pedal is to intentionally manipulate a circuit by either over-biasing

or under-biasing it, thereby achieving a desired eect. This manipulation often results in a

signicant and potentially dramatic impact on both the sound level and distortion. In most in-

stances, this eect is favorable, enhancing the overall sound. However, in certain cases, the bias

manipulation can be so extreme that it causes the signal to shift to one extreme and become

nearly non-existent. This outcome is intentionally designed into the pedal to provide users with

the opportunity to explore the full spectrum of bias shift eects. It’s essential to be aware that

using this pedal can yield a wide range of outcomes, some highly favorable and others less so.

Be warned you can get some pretty dramatic out-

comes from using this pedal, some are good and

some are “Bad Bass Preamp”.

Produktspecifikationer