HMX FJ400 vs. Bsun Tomcat

Overview

When it comes to choosing the right mechanical keyboard switch, the HMX FJ400 and the Bsun Tomcat both present compelling options for enthusiasts seeking a linear switch experience. The FJ400, recognized for being the middle ground in HMX's Film switch lineup, delivers a balanced sound profile that appeals to those who seek a harmonious typing environment without overwhelming acoustics. In contrast, the Tomcat switch stands out with its Ly stems that promise a super smooth typing experience, paired with a resonant sound profile that enhances the tactile feedback during use. While the FJ400 offers versatility for users who prefer a more subdued auditory experience, the Bsun Tomcat caters to those who prioritize buttery smoothness in every keystroke. However, let's dive in a bit deeper beyond generalities so you can best decide on the ideal switch for your needs.

By the numbers

HMX FJ400 Linear

Bsun Tomcat Linear

$3.50

$3.29 per 10

$2.99 per 10

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Housing materials

The HMX FJ400 and the Bsun Tomcat present an intriguing comparison in their choice of housing materials, particularly in their top housing design. The FJ400 utilizes POM (polyoxymethylene) for its top housing, which results in a sound profile that is deeper and relatively muted. This contrasts sharply with the Tomcat’s choice of polycarbonate, a material known for its ability to produce a sharper, higher-pitched, and more resonant sound. The stiffness of polycarbonate contributes to this clarity, creating a stark difference in auditory experience between the two switches. While the FJ400’s sound may appeal to users seeking a softer, more subdued feedback, the Tomcat caters to those who prefer a crisp, vibrant acoustic response, especially when RGB lighting is a factor due to the translucency of polycarbonate.

When examining the bottom housing of both switches, however, the materials converge. Both the FJ400 and Tomcat feature nylon as the bottom housing material, which is a long-standing choice in the keyboard community. The soft nature of nylon effectively absorbs sound, resulting in a deeper and fuller auditory experience, whether it’s in a tactile feedback when typing or in the overall acoustic profile of the switch. Therefore, despite the differing materials used in the top housings, the common use of nylon in the bottom housing means that both switches share this element, providing a rounder and more muted sound that rounds out the audio signature of each switch, ensuring a foundation of auditory depth irrespective of the top housing’s characteristics.

In practice, the differing compositions of the top housing will ultimately lead to varied experiential outcomes when typing on these switches. The POM of the FJ400 and the polycarbonate of the Tomcat separate their upper sound responses, with the FJ400 providing a more subdued release sound while the Tomcat delivers a clear and sharper release sound due to the top housing material differences. However, since both switches share a nylon bottom housing, the bottom-out sound and tactile feel will be relatively consistent, offering depth and fullness regardless of the upper casing material. In this way, users can expect to achieve a unique blend of auditory characteristics, with the nylon providing a common ground that couples well with both top housing materials, creating distinct but complementary sound profiles.

Weight

When comparing the HMX FJ400 linear switch with the Bsun Tomcat linear switch, notable differences in actuation and bottom out forces emerge. The FJ400 features an actuation force of 50 grams and a bottom out force of 58 grams, rendering it a medium-weight option. In contrast, the Tomcat has a lighter actuation force of 45 grams and a bottom out force of 54 grams, categorizing it as medium-light. This difference in force means that typists who prefer a lighter key feel might gravitate towards the Tomcat for longer typing sessions, whereas those who appreciate a firmer response may favor the FJ400. Ultimately, while both switches are classified as medium in their respective ranges, the FJ400 is the heavier switch, providing a more substantial typing experience, whereas the Tomcat's lighter force makes it easier on the fingers during prolonged use.

Travel distance

When comparing the travel distances of the HMX FJ400 linear switch and the Bsun Tomcat linear switch, the FJ400 stands out with a travel distance of 3.8 mm, while the Tomcat offers a slightly shorter travel distance of 3.6 mm. This means that when pressing down on a key, users will experience a longer travel distance with the FJ400, making it potentially more suited for those who enjoy a more pronounced and hearty keypress. On the other hand, the Tomcat, with its shorter travel distance, may cater to gamers and users who prioritize quicker response times and a more immediate feedback during typing or gaming. Ultimately, the difference in travel distance suggests that choosing between the two will depend on personal preference: the FJ400 is the better option for those who prefer a deep, tactile feel, while the Tomcat is ideal for users looking for enhanced speed and responsiveness.

Price comparison

Typing experience

In terms of sound, the HMX FJ400 linear switch is known for its balanced sound profile, providing a satisfying auditory experience that is neither too loud nor too muted. This makes it versatile for various environments, whether you're working in an office or gaming at home. In contrast, the Bsun Tomcat linear switch features a resonant sound profile, which can give your keystrokes a more pronounced and lively character. However, it's important to note that the overall sound experience for both switches can still vary based on your choice of keyboard and keycaps, as they significantly influence the acoustics.

Regarding feel, the FJ400 offers a balanced tactile experience that appeals to users seeking a satisfying feedback loop without the distraction of clicky sounds. It strikes a nice middle ground, making it suitable for both typists and gamers alike. The Tomcat, on the other hand, is noted for its super smooth typing experience, attributed to its Ly stems, which enhance gliding motion and reduce friction during use. This could be particularly appealing for those who prioritize fluidity in their typing or gaming sessions.

In summary, while both the HMX FJ400 and Bsun Tomcat linear switches offer distinct qualities in sound and feel, they cater to slightly different preferences. The FJ400 strikes a balanced sound profile and a satisfying tactile feel, while the Tomcat emphasizes a resonant sound and an exceptionally smooth typing experience. Both switches can provide enjoyable experiences, allowing users to select based on their individual preferences for auditory feedback and keystroke smoothness.

Conclusion

To conclude, the choice between the HMX FJ400 and the Bsun Tomcat linear switch ultimately depends on your personal preferences and typing style. If you prefer a balanced sound profile and a slightly heavier actuation force with a bottom-out force of 58 grams, the FJ400 may suit you well. Its medium weight provides a more deliberate typing experience that can enhance your control while typing or gaming. On the other hand, if you’re looking for a super smooth typing experience and enjoy a lighter actuation force, the Tomcat’s 54 grams of bottom-out force could be your ideal match. The resonant sound profile and the Ly stems create an enjoyable tactile experience that many find appealing for both gaming and regular typing tasks. Therefore, consider what characteristics you prioritize—whether it’s a slightly firmer feel and sound balance or a lighter, smoother keystroke—when making your decision. Ultimately, either switch can enhance your mechanical keyboard experience, but knowing your preferences will ensure you choose the right one for you.

Mentioned in this article

HMX FJ400 Linear

$3.50

$3.29 per 10

Learn more

Bsun Tomcat Linear

$2.99 per 10

Learn more