SKU: 2387556935

Rolls FX953 Bad Bass Preamp Pedal

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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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4.7 ★★★★★
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Mar Gee
Chelsea, US
★★★★★ 5
Style and comfort
Size: Medium, Color: Black
Exactly what I was looking for. Style and sock thickness and comfort.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 14, 2025
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Amazon Customer
Bozeman, US
★★★★★ 5
Comfortable
Size: Medium, Color: Blue
So comfortable! They stay up perfectly love love love
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Reviewed in the United States on December 7, 2025
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Will
Lexington, US
★★★★★ 5
Excellent all-poly athletic socks for general lifting and HIIT.
Size: Medium, Color: Black/White/Grey
***These are NOT “low” -cut socks as the description in the title states. These are actually “quarter”-cut socks as clearly visible in the picture of the sock itself. “Low” -cut socks are shorter than this height but still visible with a shoe. Also, on the actual UA package of these socks, it clearly states these are QUARTER cut socks. My review: Gave these UA Performance Tech socks (UAPT) 5 stars since they’re very good but in all reality not the best socks I’ve ever had for lifting and HIIT workouts. That title goes to Nike Dri-Fit MAX socks (DFM)….but these socks are really good. Like Nike’s DFM’s, these UAPT socks come in sizes, halleluah (M, L, and XL). The idea that most athletic sock are sized 6-12 and should therefore fit everyone perfectly is absolutely ridiculous. Your shoes come in whole and half sizes…so socks should at the very least be sized like these UAPT’s and Nike DFM’s…in S/M/L or in this case, M/L/XL. I wear a men’s size 8 shoe and the M (medium) size in these socks was a perfect fit; true to size. Also, UAPT socks are ALL polyester with Spandex which is ideal and 100% that which you want for athletic socks: wicking with stretch. Cotton socks are the absolute worst thing you could wear to the gym since they’re sponges for sweat and therefore get wet and heavy, cause blisters, tend to stink, stick to skin, etc… IF you prefer cotton socks for athletics, then you don’t understand how performance fabrics work in athletics and training. You do NOT want cotton in your athletic apparel. You want your fabrics that wick sweat away; NOT soak up sweat and hold onto it. Also, the flexibility and stretch of the foot and ankle parts of the sock were both just right. Snug but not too tight. Wicking is perfect, too. Already worn during two 3 1/2 hour workouts and my feet stayed as dry as a desert. When looking for UA athletic socks on Amazon, I surprisingly continued to find UA “athletic” socks made with mostly cotton which completely surprised me because a serious athletic company should produce an abundance of performance-level socks… i.e. all-poly socks. Thank goodness I finally came across these UA all-poly Performance Techs. The only drawback to these UAPT’s…and it’s a minor drawback…is that unlike Nike DFM’s, these do not come in L & R (left and rights) to specifically match the individual foot shape. Nike DFM socks come in L and R which sets them apart from all other athletic socks…and yet I don’t like supporting a massive monopolistic athletic apparel company like Nike, but they’re the only one that makes THE best athletic sock. Nonetheless, these UAPT’s are perfect workout/HIIT/lifting socks for the bundle value price of six pair and three colors. If you’re looking to match your new UA or Rock shoes with the appropriate UA athletic sock, then here you go. I chose the black/white/gray mix bundle since I have new pairs of a black and a white version of the same UA-Rock shoe. These UAPT socks are medium thickness so they didn’t take up an exorbitant amount of room in my shoes but they’re thick enough to prevent blisters and provide cushion. Overall they’re very comfortable, hold a good stretch, hold their shape, and seem to be durable but only time will tell. And since we’re on the black and white sock subject, I couldn’t resist: I read a shoe review about someone angered that his new UA/Rock black shoes (obviously bought for casual wear in lieu of gym use) staining his white cotton socks. First of all, never ever wear white socks (much less cotton white socks) with black athletic shoes! The possibility of staining is always there and the appearance just doesn’t work. However, you can get away with black socks with white shoes in some cases…but never white socks with black shoes. Why? Who knows? It’s just one of those unwritten rules of the gym. And no, I didn’t make the rules…so don’t blame the messenger. LOL!
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Reviewed in the United States on July 28, 2025
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Verified Purchase
Carleen DeGolyer
Houston, US
★★★★★ 5
Very soft and wears well
Size: Medium, Color: Black/White/Grey
Very nice quality and soft
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Reviewed in the United States on April 18, 2026
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Verified Purchase
Madmax
Charlottesville, US
★★★★★ 5
Great buy
Size: X-Large, Color: Black/Black/Black
Good socks that fit well.
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Reviewed in the United States on February 20, 2026

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