HMX FJ400 vs. Bsun Tomcat (Heavy)

Overview

When choosing the perfect mechanical keyboard switch, two compelling options are the HMX FJ400 and the Bsun Tomcat (Heavy), both linear switches offering unique characteristics tailored for different typing experiences. The FJ400 stands out as a balanced choice within the HMX Film switch lineup, providing a harmonious sound profile that appeals to those seeking a subtle auditory feedback while typing. On the other hand, the Bsun Tomcat (Heavy) is designed for enthusiasts who prioritize a super smooth typing experience, with its Ly stems ensuring fluid keystrokes and a resonant sound profile that adds an extra layer of enjoyment to each press. While both switches deliver impressive linear action, the FJ400 is ideal for users who value a balanced sound and feel, while the Tomcat (Heavy) is perfect for those who crave smoothness and resonance. However, let's dive in a bit deeper beyond generalities so you can best decide on the best switch for you.

By the numbers

HMX FJ400 Linear

Bsun Tomcat (Heavy) Linear

$3.50

$3.29 per 10

$2.99 per 10

Learn moreLearn more

Housing materials

The HMX FJ400 and the Bsun Tomcat (Heavy) differ significantly in their top housing materials, which plays a crucial role in shaping the acoustic characteristics of their respective switch designs. The FJ400 features a top housing made from POM (Polyoxymethylene), known for creating a deeper, more muted sound profile. This is attributed to the material properties of POM, which, while providing a unique and pleasing acoustic signature, tends to absorb a fair amount of sound energy, resulting in a warmer sound. In contrast, the Tomcat (Heavy) utilizes a polycarbonate top housing, which contributes to a sharper and brighter sound profile. The stiffer nature of polycarbonate enhances resonance, yielding cleaner and crisper sound output. Moreover, the translucence of polycarbonate makes it visually appealing for RGB lighting setups, while POM's solid finish might not offer the same visual effect.

When examining the bottom housing of both switches, it's interesting to note that both the FJ400 and the Tomcat (Heavy) employ nylon as their foundational material. This choice is common among mechanical switches due to nylon's inherent properties, which create a deeper and fuller sound profile. The softer nature of nylon effectively dampens noise, resulting in a rounder sound that enriches the overall typing experience. Because both models utilize nylon for the bottom housing, they share similar auditory characteristics in this regard, leading to a consistent, warm bottom-out sound when the keystrokes are engaged. This commonality in material will likely evoke similar tactile sensations, providing users with a satisfying experience regardless of the differences found in the top housing.

Overall, while the FJ400 and the Tomcat (Heavy) exhibit different auditory characteristics due to their top housing choices, both switches successfully leverage the benefits of nylon in their bottom housing. The distinct sound profiles arise primarily from the materials utilized in their respective top housings, with the FJ400’s POM yielding a muted resonance and the Tomcat’s polycarbonate providing a brighter articulation. Nonetheless, the shared use of nylon ensures that both switches maintain a level of deeper sound quality and satisfying tactile feel during use. For users seeking to understand the subtleties of each switch, it is essential to consider how these materials interact and influence the overall auditory and tactile experiences of typing.

Weight

When comparing the HMX FJ400 linear switch and the Bsun Tomcat (Heavy) linear switch, there are distinct differences in both actuation force and bottom out force. The FJ400 has an actuation force of 50 grams and a bottom out force of 58 grams, making it a medium-force option suitable for those who prefer a balanced typing experience. In contrast, the Tomcat (Heavy) requires a stronger actuation force of 55 grams and a bottom out force of 64 grams, categorizing it as a medium-heavy switch. This variance in force means that while the FJ400 can cater well to users looking for a lighter feel, ideal for prolonged typing or gaming sessions, the Tomcat (Heavy) provides a more substantial resistance that some users crave for a firmer typing experience. As such, those who appreciate a lighter touch should lean towards the FJ400, whereas those who prefer a heavier resistance might opt for the Tomcat (Heavy).

Travel distance

The HMX FJ400 linear switch features a travel distance of 3.8 mm, while the Bsun Tomcat (Heavy) linear switch has a slightly shorter travel distance of 3.6 mm. This makes the FJ400 the switch with the longer travel distance, offering a more pronounced key press that some users may find more satisfying and robust. In contrast, the Tomcat (Heavy), with its shorter travel distance, may appeal to gamers and those who prefer faster response times, as it allows for quicker actuation. Consequently, if navigating between vigorous typing and gaming, the choice of switch could significantly impact user experience, with the FJ400 providing a deeper feel versus the Tomcat's more rapid engagement. Overall, the difference in travel distance highlights personal preferences, with the shorter option favoring quick actions and the longer one catering to a more enriched typing experience.

Price comparison

Typing experience

In terms of sound, the HMX FJ400 linear switch offers a balanced sound profile that makes it versatile for a variety of environments, allowing for a pleasant typing experience without being overly loud. This characteristic makes it suitable for work settings or home use where noise could be a concern. In contrast, the Bsun Tomcat (Heavy) linear switch is noted for its resonant sound profile, which tends to produce a richer and more pronounced acoustic signature when typing. While both switches exhibit linear qualities that minimize noise during actuation, the Tomcat (Heavy) might stand out for those who appreciate a noticeable audio feedback accompanying their keystrokes. However, it's important to remember that the overall sound experience can greatly vary depending on the specific keyboard build and keycap materials chosen.

When it comes to feel, the FJ400 is celebrated for providing a smooth typing experience, striking a middle ground in terms of resistance and feedback that many users find comfortable for both typing and gaming. This makes it a versatile option that caters to a wide range of preferences among users. On the other hand, the Tomcat (Heavy) switch distinguishes itself with its super smooth Ly stems, which enhance the tactile experience and contribute to a more luxurious typing sensation. The effortless glide of the keypress can make a noticeable difference, attracting users who prioritize an ultra-smooth experience and may also favor a slightly heavier actuation feel.

Overall, both the HMX FJ400 and Bsun Tomcat (Heavy) linear switches present valuable qualities that cater to different user preferences. While the FJ400 strikes a balance between sound and feel, the Tomcat (Heavy) emphasizes a smoother actuation with a resonant auditory presence. Depending on your priorities—be it an all-around reliable switch or an emphasis on smoothness and unique sound characteristics—you can choose based on what aligns better with your typing preferences. If you happen to prefer something similar to either switch, you can anticipate comparable outcomes in terms of sound and feel from these selections.

Conclusion

To conclude, your choice between the HMX FJ400 and the Bsun Tomcat (Heavy) linear switch ultimately depends on your personal preferences and typing style. If you appreciate a balanced sound profile along with a medium bottom-out force of 58 grams, the FJ400 would be an excellent choice for a versatile typing experience. This makes it suitable for both casual typing and longer work sessions without causing fatigue. On the other hand, if you prefer a firmer feel and enjoy a heavy switch, then the Tomcat (Heavy) with its 64 grams of force and super smooth Ly stems would better align with your needs. This switch is ideal if you're looking for a more pronounced response and character in your keystrokes, particularly if you enjoy auditory feedback from a resonant sound profile. Ultimately, your decision should reflect what you find most comfortable and enjoyable in your mechanical keyboard experience, whether that's the balanced versatility of the FJ400 or the robust presence of the Tomcat (Heavy).

Mentioned in this article

HMX FJ400 Linear

$3.50

$3.29 per 10

Learn more

Bsun Tomcat (Heavy) Linear

$2.99 per 10

Learn more