Rolls FX953 Bad Bass Preamp Pedal
SKU: 2387556935

Rolls FX953 Bad Bass Preamp Pedal

Sale price$125.55 Regular price$139.50
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Description

Rolls FX953 Bad Bass Preamp PedalDesigned to provide electric guitarists and bassists with a safe and versatile method of exploring the full spectrum of bias shift effects, the FX953 Bad Bass Pedal from Rolls lets you easily under or over bias your instrument signals for wild new avenues of sonic potential. With the simple bias control knob, along with independent input and output level controls, you can easily achieve striking changes in sound quality without risk of damage to your

Designed to provide electric guitarists and bassists with a safe and versatile method of exploring the full spectrum of bias shift effects, the FX953 Bad Bass Pedal from Rolls lets you easily under- or over-bias your instrument signals for wild new avenues of sonic potential. With the simple bias control knob, along with independent input and output level controls, you can easily achieve striking changes in sound quality without risk of damage to your circuits from voltage spikes.

The internal Class-A preamp provides up to 43 dBV of gain, helping to maintain usable results even when bias shifts cause massive changes in output levels and distortion/breakup points. Activation is easy with a simple metal footswitch, and you can deactivate the effect without any fear of tone suck or signal loss thanks to the true bypass circuit. For bass guitars, you can replicate the distinctive tonal qualities of different bass cabinets with the 3-way low-pass filter that lets you select 500 Hz, 1 kHz, or 3 kHz. This American-made pedal can either run on the included 15 VDC power supply or a 9V battery (not included).     

A New Way to Rebias Your Signals
Born from Rolls' extensive experience in biasing amplifiers and preamps, the FX953 allows you to intentionally over- or under-bias a circuit, delivering striking changes in sound quality. Initially tailored for bass guitar applications, this pedal is compatible with any guitar, making it an invaluable tool for shaping your unique sound. The custom-designed Class-A preamplifier meticulously emulates the characteristics of tube amplification under both over- and under-bias conditions.

Unexpected Outcomes
At its core, this pedal′s primary function is to intentionally manipulate circuit bias, resulting in a desired effect. This manipulation often leads to significant and potentially dramatic changes in sound level and distortion, typically enhancing the overall sound.


However, the bias manipulation can be extreme, causing the signal to shift to one extreme and nearly disappear. This intentional design allows users to explore the full spectrum of bias shift effects. Please be aware that using this pedal can yield a wide range of outcomes, some highly favorable and others that may be considered bad. Hence the name: Bad Bass Preamp.

Specifications

General
Maximum Output Level
+10 dBV
Gain Control
Up to 32 dBV
Frequency Response
20 Hz to 20 kHz
THD
<1000%
Controls
1 x Output Volume Knob
1 x Bias Knob
1 x Input Volume Knob
1 x 3-Way Low-Pass Filter Switch
1 x Footswitch
Inputs / Outputs
Audio I/O
1x 1/4" TS Hi-Z/Instrument Input
1x 1/4" TS Hi-Z/Instrument Output
Power
Power Source
AC Adapter with Power Brick (Included), Battery
Battery Type
1x 9 V
DC Input Power
15 VDC
Physical
Color
Red
Material of Construction
Metal
Dimensions
6.75 x 4 x 1.4" / 17.14 x 10.2 x 3.6 cm
Weight
1.8 lb / 0.8 kg
Packaging Info
Package Weight
2.13 lb
Box Dimensions (LxWxH)
9.8 x 7 x 4.4"
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 2387556935

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Kate_207
Fort Morgan, US
★★★★★ 4
My dog loves these
Theme: 2 Pack, Size: Medium
My dog loves these balls. I would just keep in mind that large dogs will be able to chew them and rip the ball apart due to design. Just something to keep in mind if you have a chewer. Great that they glow in the dark. Fun for dusk or night time ball
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Reviewed in the United States on May 5, 2026
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blade
Massapequa, US
★★★★★ 5
Good for playing catch with dog in failing light.
Theme: 2 Pack, Size: Medium
Several pluses with this product. On start, the downside for some is shorter distance throwing wiffle ball effect. Now the very good points. Glows from UV light exposure for dusk, second part is easy for dog to breathe when running around with it. Works with the Nerf lighted launcher also with it it "charges" them up along with the "Chuckit" handle. The original one for the Nerf one lasted 3 throws before busting. . . Belgian malinois so no surprise. I'll definitely be ordering more in the future.
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Reviewed in the United States on March 4, 2026
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Wendy Holliday
Cuba, US
★★★★★ 5
My dog loves them!
Theme: 2 Pack, Size: Medium
Check the size before buying!! They are great balls tho!!
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Reviewed in the United States on May 20, 2026
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jewelrycook
Houston, US
★★★★★ 5
Bouncy, not hard, and good value.
Style: Fetch Balls (Pack of 10), Size: 2.5 inch
Great balls for the ball launcher and not rockhard like some of the solid rubber balls. These have great bounce, and because of the two holes, they make a fun whistling noise as they fly through the air. My dogs love them and they are a good value. By the way, if you throw them too hard, they will go through chain-link and no climb fence because they squish a bit!
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Reviewed in the United States on February 16, 2026
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IT Secure Force
Pawtucket, US
★★★★★ 5
Excellent dog balls — safe design and very durable
Style: Fetch Balls (Pack of 3), Size: 2.5 inch
These fetch balls from Amazon Basics are fantastic, and my dog absolutely loves them. One of the biggest reasons I prefer these over other brands is the hole that runs through the center of the ball. This is a very important safety feature: if a dog were to accidentally get the ball stuck in the back of the throat, the hole allows air to pass through. That small detail could literally make a life-saving difference. Aside from the safety benefit, they bounce well, are easy to clean, and hold up to a lot of playtime. They’re firm but not rock-hard, and my dog goes crazy for them. Great value, great quality, and a thoughtful design. Highly recommended for dog owners who want a safer alternative to standard solid rubber balls.
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Reviewed in the United States on December 1, 2025

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