HMX FJ400 vs. Bsun Tuzi (Bunny)
An in-depth look at the HMX FJ400 and the Bsun Tuzi (Bunny) switches—which one is the best fit for you?
Overview
When it comes to choosing the perfect mechanical keyboard switch, preferences often boil down to individual taste, and two notable contenders are the HMX FJ400 and the Bsun Tuzi (Bunny)—both linear switches that cater to specific typing experiences. The FJ400 stands out for its balanced sound profile, making it a versatile option for users who want a compromise between quietness and tactile feedback, making it suitable for both gaming and office environments. In contrast, the Bsun Tuzi (Bunny) enhances the typing experience through its refined design, incorporating a modified LY stem with a PC top and PA bottom that produces a clacky, high-pitched, and silky feel that appeals to enthusiasts seeking a bit more character in their keystrokes. While the FJ400 offers a steady, smooth experience, the Tuzi (Bunny) excites with its auditory and tactile nuances. However, let’s dive in a bit deeper beyond generalities so you can best decide on the best switch for you.
By the numbers
Technical specifications
Actuation force
50g
Actuation force
37g
Bottom-out force
58g
Bottom-out force
42g
Pre-travel
2.00 mm
Pre-travel
2.00 mm
Total travel
3.80 mm
Total travel
3.60 mm
Factory lubed
Yes
Factory lubed
Yes
Stem construction
Standard
Stem construction
Standard
Stem material
T2
Stem material
UPE
Top housing material
POM
Top housing material
Polycarbonate
Bottom housing material
Nylon
Bottom housing material
Nylon
Mount type
PCB (5-pin)
Mount type
PCB (5-pin)
Spring
22mm single-stage spring
Spring
22mm single-stage spring
Housing materials
The HMX FJ400 and the Bsun Tuzi (Bunny) exhibit distinct characteristics in their housing materials, which significantly influence their sound profiles and acoustics. The FJ400’s top housing is made from POM (polyoxymethylene), which creates a deeper and more muted sound. This material contributes to a unique auditory experience that leans towards a warmer tone, providing a softer and rounder sound as opposed to sharper, crisp sounds. In contrast, the Tuzi (Bunny) employs a polycarbonate top housing that produces a distinctly higher-pitched and clearer sound. The stiffer nature of polycarbonate amplifies the resonance, resulting in a sharper auditory profile. This fundamental difference illustrates how the choice of materials can drastically alter the acoustic performance of mechanical switches.
Both the FJ400 and the Tuzi (Bunny) feature nylon bottom housings, which standardize the sound experience between the two switches to some extent. Nylon is recognized for its ability to absorb sound effectively, leading to a deeper and fuller sound profile that creates a satisfying bottom-out feel during typing. Both switches thus benefit from this classic housing material, which delivers a duller sound that is more harmonious and rounded. Consequently, while the top housings contribute different tonal qualities and responses when a key is released, the shared nylon bottom ensures that the overall strike feels consistent between the two switches, emphasizing the deeper sound produced during the keypress.
In summary, the differing top housing materials of the FJ400 and the Bsun Tuzi (Bunny)—POM versus polycarbonate—create differing sound profiles, with the former yielding a deeper, muted tone and the latter offering a brighter, sharper auditory experience. However, the identical nylon bottom housing mitigates their differences by providing a consistent foundation of sound depth and fullness. Thus, while tactile feedback and the tonal variation observed primarily during key release may differ, the recognizable character of the deeper sound produced from the nylon bottom housing remains a unifying aspect of both switches, ensuring satisfaction in typing experience across the board.
Weight
When comparing the HMX FJ400 linear switch and the Bsun Tuzi (Bunny) linear switch, there are notable differences in both actuation force and bottom out force. The FJ400 features an actuation force of 50 grams and a bottom out force of 58 grams, categorizing it as a medium-force switch. In contrast, the Tuzi (Bunny) is lighter, with an actuation force of just 37 grams and a bottom out force of 42 grams. This makes the Bunny easier to press, which can be advantageous for prolonged typing sessions or gaming, as it requires less effort to actuate. The difference in forces means that the FJ400 offers a more substantial feel with its heavier push, appealing to those who prefer a tactile experience. Consequently, users seeking a lighter and more effortless typing experience may gravitate towards the Bsun Tuzi (Bunny), while those who enjoy a firmer keystroke might favor the HMX FJ400.
Travel distance
The HMX FJ400 linear switch features a travel distance of 3.8 mm, while the Bsun Tuzi (Bunny) linear switch has a slightly shorter travel distance of 3.6 mm. This difference in travel distance reflects the FJ400's design that leans towards a more substantial keypress, which some users may find preferable for a more pronounced tactile experience. In contrast, the Tuzi (Bunny) offers a shorter travel distance, making it potentially more appealing to gamers or those seeking quicker response times. While the standard traditional travel distance is typically around 4.0 mm, the FJ400 is closer to this standard, providing a more conventional feel, whereas the Tuzi (Bunny) caters to contemporary preferences for a more immediate, albeit less deep, response. Ultimately, the choice between these two switches will depend on individual preferences for keypress depth and responsiveness.
Price comparison
Which switch is more bang for your buck?
The HMX FJ400 has an MSRP of $3.50 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the FJ400 for $3.29.
The Bsun Tuzi (Bunny) has an MSRP of $4.00 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the Tuzi (Bunny) for $3.49.
Here at Milktooth, we offer the best prices on switches (on average, 27% lower the competition). In addition, we offer free shipping on orders over $49.00. We also offer free returns and exchanges, so you can shop with guaranteed satisfaction.
That said, while price is an important piece of the puzzle, our opinion is that you should ultimately pick the option that most suits your unique preferences since you’ll be using these switches for years to come. In other words, finding something perfect for you is, in our view, the most important criteria.
Typing experience
The sound profile of the HMX FJ400 linear switch is characterized as a balanced and pleasant experience, sitting comfortably between the more muted and vibrant end of the spectrum. In contrast, the Bsun Tuzi (Bunny) produces a notably clacky sound that is sharp, snappy, and high-pitched. This gives the Tuzi (Bunny) a more pronounced acoustic character, making it well-suited for those who appreciate a bright, crisp auditory feedback while typing. It's worth noting that the final sound you experience can greatly depend on the keyboard build and keycap materials you choose, which means that personal preference and setup can affect how these switches perform sonically.
When it comes to feel, the HMX FJ400 serves as a middle ground in terms of tactile feedback, though specific qualities aren't detailed in the provided information. The Bsun Tuzi (Bunny), however, is designed to offer a silky smooth typing experience, minimizing resistance for a seamless press and release action. This smoothness can enhance your overall typing experience, making it feel effortless and pleasant. If the FJ400 also delivers a smooth feel, you'll enjoy a comparable typing experience with a focus on fluidity, though the specifics of its tactile response remain unclear.
In conclusion, while the HMX FJ400 linear switch offers a balanced sound profile, the Bsun Tuzi (Bunny) excels in delivering a clackier, high-pitched auditory experience. Additionally, the Tuzi (Bunny) is known for its silky feel, which may or may not be matched by the FJ400 depending on its specific characteristics. Ultimately, if you're seeking a switch with refined sound and smoothness, the Bsun Tuzi (Bunny) stands out, but depending on your preferences, the FJ400 may still provide a satisfying option, particularly in terms of sound and feel.
Conclusion
To conclude, choosing between the HMX FJ400 linear switch and the Bsun Tuzi (Bunny) linear switch ultimately depends on your personal preferences and intended use. If you favor a balanced sound profile with a medium bottom-out force of 58 grams, making it suitable for both typing and gaming, the FJ400 is an excellent choice. It provides a satisfying tactile feedback and offers a good equilibrium between sound and feel, making it ideal for users who might be transitioning from clicky switches but still want some auditory and tactile engagement. On the other hand, if you appreciate a lighter typing experience with a bottom-out force of only 42 grams, the Tuzi (Bunny) offers a remarkably smooth and silky feel that enhances your overall typing comfort. The high-pitched, clacky sound will appeal to those who enjoy a crisp auditory feedback while typing. Therefore, if you prioritize an exceptionally refined and responsive typing feel with an emphasis on sound, the Tuzi (Bunny) would be more suitable for your setup. Ultimately, your choice should reflect your typing style, sound preferences, and the type of experience you seek in your mechanical keyboard.
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