Product Details
The Spektrum Firma Sensored Smart ESC is specifically engineered to be used with 6th scale Crawlers and Scalers, such as the Axial SCX6. Featuring advanced Smart connectivity, professional drag brake performance and torque control, all while being fully waterproof.
Key Features
- 2S-4S LiPo Compatible
- Waterproof ESC
- Smart All-in-one Telemetry
- Pro-level Drag Brake Performance and Adjustability
- 120 Amp Power for Giant Scale Crawlers and Extremely Heavy Crawlers
In The Box
- (1) Spektrum Firma 120A Sensored Brushless Crawler ESC
- (1) Product Manual
- (1) Sticker Sheet and Mounting Tape
- (1) Optional ESC Fan
Needed to Complete
- (1) Spektrum Firma Sensored Brushless Crawler Motor
- (1) 2S or 4S Lipo Battery with EC3 or IC3 Connector
- (1) Spektrum Transmitter
- (1) Spektrum Surface Receiver
Key Benefits
- Smart: Integrated Smart Technology
- Sensored: Great for slow speed driving and next level drag brake performance
- Program Via Transmitter: Proprietary Text Gen programming allows for programming the ESC from the transmitter
Features
- Smart all-in-one telemetry
- Pro-level drag brake performance and adjustability
- RPM/Throttle matching enabled
- FOC (Field-Oriented Control) equipped
- 120 Amp power for giant scale crawlers and extremely heavy crawlers
- 2S-4S LiPo compatible
- Fast, powerful 32-bit ARM M4 processor
- Waterproof ESC
- Waterproof sensor wire with locking plug and gasket
- Developed and designed by Spektrum™ engineers, in partnership with the industry's leading ESC manufacturer
- Compact for easy installation in most applications
- Ready to install — no soldering required
- Aluminum heat sink for high efficiency
- Includes optional cooling fan
- Adjustable high-power BEC (6V or 7.4V)
- Firmware updatable through the Smart ESC Programming Box
- High heat-resistant IC™ connectors, backwards compatible with EC™ connectors
- Limited 1-year warranty
Multiple Options For Easy Programming
- Smart ESC Programming Box (V2 Programming Box Required)
- SmartLink USB Updating and Programmer application
- Programming from Transmitter via Text Gen Telemetry
Multi-point Protection
- Over-current protection
- Automatic LiPo low-voltage cutoff
- Thermal protection
- Failsafe protection
Overview
The Spektrum Firma Sensored Smart ESC System is specifically engineered to be used with 6th scale Crawlers and Scalers, such as the Axial® SCX6™. Featuring advanced Smart connectivity, professional drag brake performance and torque control, all while being fully waterproof.
Like every component in the Spektrum™ Smart ecosystem, Firma™ Smart ESCs combine "plug-and-play" simplicity with the ability to communicate with other Smart electronics — together, creating the best-performing RC system for your vehicle imaginable.
Firma Smart ESCs do much more than regulate power. They function like a virtual engineer inside your model, providing a direct path to the vital operating data you need to reach peak performance. Firma Smart ESCs give you an extra layer of confidence that your electronics are all operating at their best.
With Firma Smart ESCs, you'll be better connected to your vehicle than ever before — without installing extra components that all work independently of each other. You won't need extra wires, modules, or links. A Firma electronic speed control provides a one-wire solution for obtaining telemetry data such as RPM, temperature, battery voltage and capacity.
Firma ESCs not only gather the data, but also send it to your transmitter in real time, instead of only storing it for after-run study. You're able to adjust settings as needed to boost performance on the go. The Firma Smart single-wire telemetry solution has been tested for quality and performance by the best brands in RC. Their verdict? Smart technology is both simpler and superior!
Overview
The Spektrum Firma 120A Sensored Brushless Smart ESC represents the pinnacle of electronic speed controller technology for serious RC crawler enthusiasts in the UK. Engineered specifically for 6th scale crawlers and scalers such as the Axial SCX6, this professional-grade ESC delivers exceptional power, precision and reliability for giant scale crawlers and extremely heavy RC vehicles. Whether you're tackling challenging terrain or competing at the highest level, the Firma 120A combines cutting-edge sensored brushless technology with Smart connectivity to give you complete control and real-time telemetry data from your RC car.
This waterproof ESC is designed for users who demand the very best performance from their brushless RC crawler. The 120 Amp continuous rating provides more than enough power for even the most demanding applications, whilst the integrated Smart technology allows you to monitor and adjust your setup wirelessly. For anyone serious about RC crawling in the UK market, the Firma 120A Sensored ESC is the ultimate choice for professional drag brake performance and adjustability.
With advanced Field-Oriented Control (FOC) technology, a powerful 32-bit ARM M4 processor, and waterproof construction including a waterproof sensor wire with locking plug and gasket, this ESC is built to handle the toughest conditions. The compact aluminium heat sink design ensures high efficiency and easy installation in most applications, whilst the optional cooling fan provides additional thermal management for extended running sessions.
Key Features
- 120 Amp Continuous Power — This ESC delivers 120 amps of continuous power, making it ideal for giant scale crawlers and extremely heavy RC vehicles that require substantial torque and pulling power for challenging terrain and steep climbs.
- Sensored Brushless Technology — The sensored design provides exceptional slow-speed control and next-level drag brake performance, giving you precise throttle response even at crawling speeds where traditional brushless systems struggle.
- Smart All-in-One Telemetry — Integrated Smart technology provides real-time telemetry data directly to your Spektrum transmitter, allowing you to monitor critical performance metrics including voltage, temperature and current draw during operation.
- Professional Drag Brake Performance — Adjust drag brake settings through your transmitter for pro-level performance and complete control over engine braking characteristics, essential for competitive crawling and technical terrain.
- Field-Oriented Control (FOC) — Advanced FOC technology delivers smoother, more efficient power delivery and better throttle linearity compared to standard sensored systems, enhancing overall vehicle control.
- RPM/Throttle Matching Enabled — The ESC automatically matches RPM to throttle input for consistent performance across varying battery voltages and load conditions throughout your battery's discharge cycle.
- Waterproof Construction — Completely waterproof design protects internal electronics from water ingress, making this ESC suitable for wet environments and water crossing scenarios that serious crawlers encounter.
- Waterproof Sensor Wire — The sensor wire features a locking plug and gasket to ensure water does not compromise the sensored feedback system, maintaining performance reliability in all conditions.
- Fast 32-bit ARM M4 Processor — The powerful processor enables rapid response to control inputs and complex calculations for advanced features like FOC and Smart telemetry integration.
- 2S-4S LiPo Battery Compatible — Works with 2S, 3S or 4S LiPo batteries, giving you flexibility in power source selection for different crawlers and running preferences across the RC car spectrum.
- Adjustable High-Power BEC — Select between 6V or 7.4V output from the built-in Battery Elimination Circuit to power your receiver and servo independently, providing stable power regardless of battery voltage fluctuations.
- Proprietary Text Gen Programming — Program the ESC directly from your Spektrum transmitter using intuitive Text Gen programming interface, with no computer or additional software required.
- Ready to Install — No Soldering Required — The ESC comes pre-assembled with high heat-resistant IC connectors that are backwards compatible with EC connectors, allowing for quick installation in most RC crawler platforms.
- Aluminium Heat Sink Design — The compact aluminium heat sink ensures high efficiency and rapid heat dissipation during long running sessions, maintaining optimal performance temperatures.
- Optional Cooling Fan Included — An optional cooling fan is provided to enhance heat management during extended operation or in high-ambient temperature conditions.
- Firmware Updatable — Keep your ESC current with the latest performance improvements and features through firmware updates via the Smart ESC Programming Box.
- High Heat-Resistant IC Connectors — Premium connectors rated for high current and heat resistance ensure reliable power delivery and durability for years of demanding use.
- Compact for Easy Installation — The streamlined design fits easily into most modern crawler platforms, including tight mounting spaces on 6th scale and larger RC vehicles.
- Professional Engineering — Developed and designed by Spektrum engineers in partnership with industry-leading ESC manufacturers, ensuring world-class quality and performance standards.
- 1-Year Limited Warranty — Backed by Spektrum's confidence in product quality with comprehensive limited warranty coverage for manufacturing defects.
Technical Performance
The Spektrum Firma 120A Sensored Brushless Smart ESC represents a significant advancement in brushless RC crawler technology. With its 120 Amp continuous rating, this ESC is specifically engineered to handle the demands of 6th scale crawlers and extremely heavy RC vehicles that require sustained power for challenging terrain. The sensored brushless design delivers exceptional slow-speed control essential for technical rock crawling, whilst the advanced Field-Oriented Control (FOC) technology ensures smooth, efficient power delivery with precise throttle response. The 32-bit ARM M4 processor handles complex calculations in real-time, enabling features like RPM/throttle matching that maintain consistent performance even as battery voltage decreases during a run. Built with a robust aluminium heat sink and complete waterproof construction including a waterproof sensor wire with locking plug and gasket, this ESC can handle submersion and demanding wet conditions. The professional drag brake performance is fully adjustable through your Spektrum transmitter, allowing you to fine-tune engine braking characteristics for different terrain types and driving styles. Supporting 2S through 4S LiPo batteries, the Firma 120A delivers substantial power across various voltage configurations, with an adjustable high-power BEC providing stable 6V or 7.4V output for receiver and servo power. The Smart telemetry integration keeps you informed in real-time of critical parameters including battery voltage, current draw and internal ESC temperature, helping you optimise your running sessions and maintain equipment reliability.
What's in the Box
- Spektrum Firma 120A Sensored Brushless Crawler ESC (1)
- Product Manual (1)
- Sticker Sheet and Mounting Tape (1)
- Optional ESC Cooling Fan (1)
What You Need to Complete
- Spektrum Firma Sensored Brushless Crawler Motor — Choose the appropriate KV rating for your specific crawler model and weight
- 2S or 4S LiPo Battery with EC3 or IC3 Connector — The ESC accepts batteries from 2S up to 4S LiPo configuration
- Spektrum Transmitter — A compatible Spektrum radio system is required to control the vehicle and access Smart telemetry features
- Spektrum Surface Receiver — Pair with a compatible Spektrum surface receiver to receive control signals from your transmitter
Frequently Asked Questions
- Is the Spektrum Firma 120A suitable for beginners to RC crawling? — Whilst this is a professional-grade ESC with advanced features, it is accessible to dedicated enthusiasts who are serious about RC crawling. The Smart telemetry and programmable features via transmitter make it easier to understand and optimise performance compared to traditional ESCs. However, complete beginners may want to start with a simpler 40 or 60 Amp ESC before progressing to this professional model.
- What batteries are compatible with the Firma 120A Sensored ESC? — The ESC supports 2S, 3S and 4S LiPo batteries with EC3 or IC3 connectors. Different battery configurations provide varying performance characteristics; 2S offers lighter weight and longer run times, whilst 4S provides maximum power for the heaviest crawlers.
- How does sensored brushless technology benefit crawler performance? — Sensored brushless ESCs use internal position sensors to detect motor rotor position, enabling precise commutation at extremely low speeds. This provides exceptional slow-speed control essential for technical rock crawling, superior drag brake performance, and better overall responsiveness compared to sensorless brushless systems.
- Can I program the Firma 120A without a computer? — Yes, the Firma 120A features proprietary Text Gen programming that allows you to adjust all settings directly through your Spektrum transmitter. No computer connection or additional software is required, making programming quick and convenient at the field.
- What is the difference between Field-Oriented Control (FOC) and standard commutation? — FOC is an advanced control algorithm that provides smoother, more efficient power delivery and better throttle linearity. It calculates the optimal current phase angle in real-time, resulting in improved performance, reduced heat generation, and superior control feel compared to traditional sensored systems.
- Is this ESC waterproof? — Yes, the Firma 120A is fully waterproof with complete internal sealing and a waterproof sensor wire featuring a locking plug and gasket. This makes it suitable for water crossings and wet terrain common in advanced RC crawling, though you should still avoid prolonged submersion.
- What is Smart telemetry and how does it help? — Smart telemetry wirelessly transmits real-time data to your Spektrum transmitter, displaying critical information including battery voltage, current draw and ESC temperature. This allows you to monitor equipment health, optimise running time, and prevent damage from over-discharging or overheating.
- Can I use this ESC with non-Spektrum motors and receivers? — The Firma 120A is specifically designed for use with Spektrum Firma sensored brushless motors and requires a Spektrum receiver to access all features including Smart telemetry and transmitter programming. It may work with other sensored motors, but full functionality and optimal performance require Spektrum components.
- What BEC voltage should I select for my servo? — The adjustable high-power BEC allows selection between 6V and 7.4V output. Most standard crawling servos operate at 6V, whilst high-torque competition servos typically require 7.4V. Consult your specific servo specifications to select the correct voltage.
- What cooling solutions are available? — The ESC includes an optional cooling fan in the box. For extended operation in hot conditions, you can mount this fan directly to the heat sink. The compact aluminium heat sink design provides excellent passive cooling for most applications.
- How long is the warranty period? — The Firma 120A comes with a limited 1-year warranty covering manufacturing defects. This demonstrates Spektrum's confidence in the product quality and durability, providing peace of mind for your investment.
- Is this ESC compatible with my existing Spektrum radio system? — The Firma 120A works with all current Spektrum transmitters and surface receivers. Smart telemetry features require a compatible Spektrum transmitter; check your specific radio model to confirm Smart compatibility.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the SPM FIRMA Crawler 120A Sensored BL Smart ESC P-SPMXSE1080 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
Finance Options
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Novuna Personal Finance Available on this product
| DEPOSIT |
MONTHS |
APR |
MONTHLY PAYMENTS |
TOTAL AMOUNT PAYABLE |
| 24 Month Credit |
| £26.80 |
24 |
19.9% |
24 x £12.08 |
£316.72 |
| 36 Months Credit |
| £26.80 |
36 |
19.9% |
36 x £8.75 |
£341.80 |
| 48 Months Credit |
| £26.80 |
48 |
19.9% |
48 x £7.12 |
£368.56 |
| Buy Now Pay Later 48 months (6 months Deferred) |
| £26.80 |
48 |
24.9% |
48 x £8.40 |
£430.00 |
| Buy Now Pay Later 48 months (10 months Deferred) |
| £26.80 |
48 |
24.9% |
48 x £8.88 |
£453.04 |
| Buy Now Pay Later 48 months (12 months Deferred) |
| £26.80 |
48 |
24.9% |
48 x £9.39 |
£477.52 |
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