Electro Harmonix Nano Battalion Bass Pre & OD
Feature-rich analog bass preamp and overdrive with flexible routing, outstanding for its price, just watch out for power compatibility issues.
★★★★☆ 4.3/5 · 6 buyer reviews · 7 min read · updated 2026-10-07 · Tested by Cal Whitaker
Electro Harmonix Nano Battalion Bass Pre & OD: Sound and Features
The Electro Harmonix Nano Battalion Bass Pre & OD is designed as a fully analog preamp and overdrive floor pedal. Using a MOSFET-based circuit, it brings flexibility and distinct character to bass and even electric guitar setups. Marketed as a straightforward yet highly adaptable unit, it manages to cover both clean boost and saturated overdrive with next to no learning curve, while still providing deeper sound customization options for more advanced users.
Core Controls and Signal Routing
On the control panel, the pedal offers:
- Volume: Sets overall output level.
- Drive: Adjusts the gain or amount of overdrive added.
- Blend: Balances between your unaffected ('dry') and affected ('wet') signal, especially useful for bass where punch and clarity need to be retained even under heavy gain.
- Tone, Treble, Bass: Three-band tone shaping. Treble targets around 1 kHz, bass controls approximately 200 Hz, and mid frequencies are adjusted separately.
- EQ switch: Three distinct routing modes for where EQ is applied in the signal path.
- Mid switch: Provides a boost or cut of 9 dB at 500 Hz for detailed midrange control.
The variety in EQ routing is the standout feature. 'Distortion' positions the EQ after distortion, shaping only the affected signal for more aggressive tonal sculpting. 'Input' puts the EQ before the drive stage, pushing EQ'd frequencies harder into MOSFET saturation, which makes a clear difference in how punchy or compressed your overdrive sounds. 'Dry' mode applies EQ only to the clean part of the blend, so you can keep the low-end clarity while letting the overdriven layer punch through the mix or be toned separately. This element alone lifts the Nano Battalion above a typical fixed-circuit overdrive or preamp pedal.
Build and Connectivity
Measuring 70 by 114 by 51 millimeters, the Nano Battalion is compact and standard for a modern pedalboard. The input and output jacks are full-size 6.3 mm (1/4 inch). The output supports both unbalanced (regular mono cable) and balanced (stereo cable) connectivity, which is crucial if you want to send a clean, low-noise signal straight to a mixer, interface, or PA without additional DI boxes.
Current draw is modest at 45 mA. Power is supplied via a 9V DC adapter, and the box includes this power supply. Notably, user reports confirm that it has compatibility issues with many third-party pedalboard power supplies, using others may introduce unwanted high-frequency noise, especially when the treble knob is turned up. This limits flexibility in complex pedalboards, as you will likely need to use the included original adapter to ensure noise-free performance.
Sound Character and Real-World Impressions
The MOSFET drive circuit delivers a warm and gritty overdrive, the type of breakup that remains musical and punchy, avoiding the brittle fuzz or harsh edge of some digital or more extreme analog pedals. With moderate drive, you get boost and subtle hair; at higher levels, it pushes into controlled distortion. The blend knob lets you keep your fundamental clear, giving punch and articulation especially for bass guitar, even if you heavily saturate the second channel.
The EQ is effective: treble and bass offer precise enhancement or reduction without overwhelming the signal, while the mid switch changes the voice in a way that cuts through a mix or tames aggressive upper-mids. For studio work, users have had positive experiences running this pedal either before compressor/eq pedals or as the last link before the mixing board. It slots into a pedalboard seamlessly, and works well with classic basses like the Fender Precision, but also delivers interesting results with electric guitar (tested with an Ibanez in one review) and with a bass synthesizer chain.
Versatility and Value
User reviews consistently highlight its versatility as an overdrive, there's enough range to cover subtle preamp warmth, mid-boosted crunch, and proper drive suitable for aggressive styles without veering into unusable fuzz. The different EQ routings give fine control over tonal shaping. However, some consider the EQ to be relatively restrained compared to standalone equalizers, but the available options do make a real difference to the sound. The unit is praised for its intuitive interface, novices can get a usable sound, while more experienced players benefit from the extra routing flexibility.
Some downsides are worth noting. The small, slightly stiff knobs can make fine adjustments less comfortable. At this price, you're not getting onboard compression or more elaborate dual-mode operation found in more expensive rivals, but the Nano Battalion's footprint, simplicity and focused features are difficult to fault at under $100.
Conclusion
The Electro Harmonix Nano Battalion Bass Pre & OD pedal stands out in its price range with comprehensive analog preamp and overdrive capabilities, a flexible EQ routing system, and reliable direct out connectivity. While limited by its specific power requirements and small controls, it brings substantial tone-shaping options and MOSFET saturation to any pedalboard. It's a top pick for musicians needing a compact, budget-friendly bass (or guitar) preamp and drive, either for live use or recording setups.
Shipping and duties
The retailer ships from its warehouse in Germany. Prices are shown in US dollars and do not include import duties. Orders under roughly $800 usually clear US customs without duty; above that, a duty of a few percent may be collected on delivery. 30-day money-back and a 3-year warranty apply.
Scores by area
Where it shines, where it stumbles
What convinced me
- Extensive EQ and routing options allow for precise tone shaping
- Versatile MOSFET analog drive suitable for both subtle and saturated sounds
- Affordable pricing for the feature set offered
- Blend control enables effective mix between clean and effected signals
- Compact size easily fits into any pedalboard setup
What bugged me
- Small, stiff control knobs can hinder precise adjustments
- Requires original power adapter to avoid unwanted noise, limiting power supply options
- No compressor or dedicated volume controls for separate effect sections
- EQ section may feel a bit subdued for users seeking more aggressive tone shifts
Is it the right one for you?
Good pick if
Ideal for bassists needing flexible tone shaping, those who want to mix clean and overdriven signals, and players on a budget seeking studio-worthy direct output. Great for anyone integrating compact, versatile effects into their pedalboard.Look elsewhere if
Not recommended for those reliant on pedalboard power supplies rather than the original adapter, users requiring aggressive EQ, or those who prefer larger, easy-to-adjust knobs. Less suited for players wanting built-in compression or dual volume controls.Suggested level: Intermediate
Specifications
- Design
- Floor Effects Pedal
- Tubes
- No
- Amp modeling
- No
- Integrated effects
- No
- Headphone output
- No
- Direct out
- Yes
- Midi connector(s)
- No
- Integrated expression pedal
- No
- Connections for pedals or switches
- No
- Aux input
- No
- Integrated tuner
- No
- Usb connection
- No
- Effect types
- Preamp & Overdrive
What other players say
Customers generally appreciate the Nano Battalion for its remarkable versatility in tone shaping, especially the multiple EQ routing options and MOSFET-based drive. The pedal is consistently praised for flexibility, offering everything from light grit to substantial overdrive, and is considered user-friendly for both studio and live settings. However, several users note drawbacks such as small, hard-to-turn control knobs and problematic compatibility with pedalboard power supplies, which can produce noise unless the original adapter is used. Despite minor operational quirks, the product is regarded as a versatile, cost-effective choice among bass pedals.
It's the most versatile, flexible, and adaptable overdrive pedal I've handled.
The EQ switch offers three signal path options for drastically different tones.
It's only usable with the original power adapter, other pedalboard supply options create a nasty high-pitched noise.
Up close
Watch and listen
Before you decide
Questions players ask
Is the Nano Battalion compatible with standard pedalboard power supplies?
Most users report unwanted noise when using common pedalboard power supplies. For clean operation, the original included Electro Harmonix adapter is required.
Can the pedal drive both clean and distorted sounds simultaneously?
Yes, the Blend control and EQ routing switches allow users to mix clean and distorted signals, offering extensive tonal possibilities.
Does it work with electric guitars as well as basses?
Although designed for bass, users have reported satisfying results with electric guitars, especially when paired with other effects.
Are there output options for both balanced and unbalanced signals?
Yes, the output jack provides either unbalanced mono or balanced stereo output, ideal for both amps and direct recording interfaces.
Is the EQ section powerful enough for live use?
The 3-band EQ and MID switch provide meaningful control over frequency response, but some users may find the EQ less aggressive than expected.
The last word from the bench
Electro Harmonix Nano Battalion delivers a versatile, all-analog preamp and overdrive experience, excelling with its routing and tone control flexibility. The pedal adapts easily from gentle warmth to near-distortion and accommodates a variety of playing contexts. Usability is straightforward, though the small knobs and strict power requirements are noteworthy limitations. Despite these quirks, its value and sonic range make it an attractive choice for bassists wanting flexible drive and EQ in a compact footprint.
Hanging next to it
Electro Harmonix Nano Battalion Bass Pre & OD
Today's price and delivery time are shown at the retailer.
Guitar Gear Reviews