HMX FJ400 vs. TTC Neptune
An in-depth look at the HMX FJ400 and the TTC Neptune switches—which one is the best fit for you?
Overview
When it comes to choosing a mechanical keyboard switch, the distinctions between the HMX FJ400 and the TTC Neptune exemplify the rich variety available to typists and gamers alike. The FJ400, positioned as the middle ground in the HMX Film switch lineup, is celebrated for its balanced sound profile that caters to users seeking a satisfying auditory experience without overwhelming noise. In contrast, the TTC Neptune stands out with its innovative internal structure, providing a unique smoothness akin to the delightful texture of chewy mochi, along with a muted yet thocky sound signature that many users find appealing. Both switches are categorized as linear, meaning they deliver a consistent keystroke with no tactile feedback, but their individual characteristics cater to different preferences—whether one values a well-rounded sound or a slightly springy, frictionless glide. Ultimately, selecting between the FJ400 and Neptune comes down to personal preference, but let's dive in a bit deeper beyond generalities so you can best decide on the ideal switch for you.
By the numbers
Technical specifications
Actuation force
50g
Actuation force
41g
Bottom-out force
58g
Bottom-out force
50g
Pre-travel
2.00 mm
Pre-travel
2.00 mm
Total travel
3.80 mm
Total travel
3.80 mm
Factory lubed
Yes
Factory lubed
Yes
Stem construction
Standard
Stem construction
Standard
Stem material
T2
Stem material
POM
Top housing material
POM
Top housing material
POM
Bottom housing material
Nylon
Bottom housing material
Polycarbonate
Mount type
PCB (5-pin)
Mount type
PCB (5-pin)
Spring
22mm single-stage spring
Spring
Lengthened 21.5mm spring
Housing materials
When comparing the housing materials of the HMX FJ400 and the TTC Neptune, the first notable similarity lies in their top housing—both switches utilize POM (polyoxymethylene) material for this component. The POM top housing contributes an incredibly pleasing and unique sound profile to both switches, characterized by a deeper and more muted auditory experience. This commonality indicates that users of either switch can anticipate a similar sound quality when pressing the keys, making them relatively comparable in terms of the acoustic experience during typing. The choice of POM for the top housing effectively creates a subtle balance in sound, underscoring the rich sound signature both switches offer.
In contrast, the bottom housing materials diverge significantly between the two switches, influencing the overall auditory experience and tactile feedback. The HMX FJ400 features a nylon bottom housing, recognized for its ability to generate a deeper and fuller sound profile due to its softer composition. This softness enables nylon to absorb more sound, resulting in a duller yet rounder acoustic character that many users prefer for a smooth and enjoyable typing experience. Conversely, the TTC Neptune employs a polycarbonate bottom housing, which is noted for its higher-pitched and crisper sound profile. The stiffness of polycarbonate provides a sharper resonance that enhances clarity in the sound produced, marking a distinct contrast to the FJ400's rounded auditory output.
Ultimately, the differences between the bottom housing materials do influence the keyboard experience, impacting the bottom-out sound and feel significantly. With the FJ400’s nylon bottom delivering a muted yet full sound upon bottoming out, users may appreciate a softer sensation during use, complemented by the POM top's deep tonal qualities. In contrast, the Neptune’s polycarbonate bottom housing not only enhances clarity but also brings brightness to the acoustic experience, offering a spirited typing action. Though both switches share similarities in their top housing, the divergent characteristics of their bottom materials ensure that each keyboard delivers a unique tactile and auditory experience, allowing users to choose based on their specific preferences for sound and feel.
Weight
When comparing the HMX FJ400 linear switch and the TTC Neptune linear switch, notable differences emerge in both actuation and bottom out forces. The FJ400 has an actuation force of 50 grams and a bottom out force of 58 grams, positioning it as a medium-weight switch. In contrast, the Neptune features a lighter actuation force of 41 grams and a bottom out force of 50 grams. These differences suggest that users seeking prolonged typing sessions or prolonged gaming may find the Neptune more comfortable due to its lower actuation force. However, players or typists who prefer a more substantial feel may lean towards the FJ400, which provides a heavier force for a firmer typing experience. In summary, if a lighter touch is preferred, the TTC Neptune would be the better choice, while those seeking a more robust keystroke would find the HMX FJ400 suitable.
Travel distance
Both the HMX FJ400 linear switch and the TTC Neptune linear switch have an identical travel distance of 3.8 mm, meaning that users will experience the same key press depth when using either switch. This similarity ensures that the feel and responsiveness of both switches will be comparable, providing a consistent typing experience. Since the travel distances are equal, users seeking uniformity in key presses across different switches can confidently choose either, knowing they will achieve similar results in feel and performance.
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 TTC Neptune has an MSRP of $7.99 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the Neptune for $5.09.
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
In terms of sound, the HMX FJ400 linear switch presents a balanced sound profile, making it suitable for a wide range of environments— from casual home use to professional settings. This neutrality is coupled with a subtler character, which allows the FJ400 to blend into the background without disturbing others. On the other hand, the TTC Neptune linear switch features a low-pitched, muted sound signature, characterized as thocky and subdued. This provides a deeper and richer acoustic feedback with each keystroke, reminiscent of a satisfying “thud” or soft “knock.” While both switches offer distinct sound profiles, the Neptune leans towards a bass-heavy experience, making it noteworthy for those who enjoy a more pronounced auditory sensation.
When considering the feel of these switches, the FJ400 is positioned as a middle ground, suggesting a balance between responsiveness and comfort, although specific descriptors were not provided. In contrast, the TTC Neptune showcases a unique combination of buttery and frictionless qualities, delivering an effortless and smooth typing experience. The gummy sensation it offers makes the actuation feel as though you're bottoming out on a trampoline, creating a playful yet satisfying feedback. Overall, while the FJ400's feel remains a bit more ambiguous, the Neptune clearly excels with an innovative, polished tactile experience that users may find delightful.
In conclusion, both the HMX FJ400 and TTC Neptune linear switches cater to different preferences in sound and feel. The FJ400 offers a neutral and balanced acoustic profile, suitable for various typing environments, whereas the Neptune captivates with its deep, thocky sound and unique tactile characteristics, providing a standout typing experience. Although they differ in these subjective qualities, both switches promise to deliver satisfying results, ideal for newcomers seeking to explore the diverse world of mechanical keyboard switches.
Conclusion
To conclude, the choice between the HMX FJ400 linear switch and the TTC Neptune linear switch ultimately hinges on your typing preferences and overall usage scenario. If you appreciate a balanced sound profile and a slightly stiffer typing experience, the FJ400, with its medium bottom-out force of 58 grams, might be the right fit for you. It's ideal for those who prefer a bit more resistance while typing, providing a solid, reliable feedback with a medium-thock sound that balances noise and tactility. On the other hand, if you lean towards a lighter and swifter typing feel, the TTC Neptune is your best bet. With a bottom-out force of just 50 grams, it offers a frictionless, buttery experience that can feel almost effortless, making it perfect for rapid typing sessions or gaming while providing a muted, thocky sound that keeps things pleasantly subdued. Therefore, consider how much force you enjoy feeling under your fingers and the sonic atmosphere you wish to create—whether it’s the balanced dynamics of the FJ400 or the smooth, quiet flexibility of the Neptune.
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