HMX FJ400 vs. SP-Star RedBlue
An in-depth look at the HMX FJ400 and the SP-Star RedBlue switches—which one is the best fit for you?
Overview
When it comes to selecting the perfect mechanical keyboard switch, two notable contenders are the HMX FJ400 and the SP-Star RedBlue, both of which are linear switches that cater to different typing preferences. The FJ400 stands out in the HMX Film switch lineup as a middle ground option, known for its balanced sound profile that appeals to users seeking a harmonious typing experience without excessive noise. On the other hand, the SP-Star RedBlue switches offer a unique charm, particularly suited for those who enjoy a medium-light typing experience, characterized by a low-pitched, thocky sound that many users find satisfying. The RedBlue is also described as polished and neutral, making it a versatile choice for varied typing tasks. Ultimately, the decision between the FJ400 and RedBlue comes down to personal preference for sound and feel, 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
N/A
Bottom-out force
58g
Bottom-out force
57g
Pre-travel
2.00 mm
Pre-travel
2.00 mm
Total travel
3.80 mm
Total travel
4.00 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
Polycarbonate
Bottom housing material
Nylon
Bottom housing material
Polycarbonate
Mount type
PCB (5-pin)
Mount type
PCB (5-pin)
Spring
22mm single-stage spring
Spring
Gold plated
Housing materials
The housing materials of the HMX FJ400 and the SP-Star RedBlue switches present contrasting acoustic profiles that stem from the unique characteristics of the plastics used in their manufacturing. The FJ400 features a top housing made from Polyoxymethylene (POM), which yields a sound profile that is deeper and more muted. This softer sound comes from POM's ability to absorb sound better than harder materials. Conversely, the RedBlue’s top housing is made of polycarbonate, a material known for its rigidity, resulting in a sharper and crisper sound profile. This fundamental difference in material properties directly leads to escalated auditory experiences based on the housing's design, catering to distinct user preferences in tactile feedback and sound.
Turning to the bottom housing, there is an equally striking difference. The FJ400 utilizes nylon, renowned for its softer and more absorbent nature. As a result, the sound produced with the FJ400 tends to be deeper and fuller due to nylon's capacity to dull the auditory feedback, creating a rounder sound that is often preferred by typing enthusiasts looking for a muted experience. In stark contrast, the RedBlue employs polycarbonate for its bottom housing as well, mirroring its properties from the top housing. Consequently, this choice further accentuates the switch’s higher-pitched and resonant sound profile, delivering clarity that can be ideal for those who prefer a sharper auditory response when typing.
While the FJ400 and RedBlue switches utilize different materials for their top and bottom housings, it's important to recognize that this dichotomy creates distinct acoustic results that appeal to varied preferences. The FJ400's combination of POM and nylon produces a rounded, more muted typing experience, whereas the RedBlue's all-polycarbonate construction allows for a brighter and more pronounced sound. Despite their differences, both switches can be rewarding under certain conditions; users can attain similar overall tactile satisfaction by playing around with switch combinations or modifications, further bridging the gap between the alternative experiences offered by each switch. Whether you seek a deeper or sharper sound, exploring the interaction of the materials can lead to an enjoyable typing experience.
Weight
When comparing the HMX FJ400 linear switch and the SP-Star RedBlue linear switch, we find distinct differences in their actuation forces while their bottom-out forces are relatively similar. The FJ400 has an actuation force of 50 grams, whereas the actuation force for the RedBlue is unknown. This means that, assuming users favor a tactile feedback and a more substantial typing experience, they might find the FJ400 more satisfying for extended typing or gaming sessions. However, with a bottom-out force of 58 grams for the FJ400 and a slightly lighter 57 grams for the RedBlue, both switches provide a medium-light resistance at the point where the key is fully pressed down. Overall, the FJ400 is the heavier option due to its known actuation force, while the RedBlue may cater to those who prefer a lightweight typing experience, especially if they enjoy the benefits of a lighter switch. If the actuation force of the RedBlue were to be matched with the FJ400, the overall typing experience might still be comparable based on the users' preference for lighter or heavier switches.
Travel distance
When comparing the travel distances of the HMX FJ400 linear switch and the SP-Star RedBlue linear switch, it is clear that they differ in their specifications. The FJ400 features a travel distance of 3.8 mm, while the RedBlue offers a slightly longer travel distance of 4 mm. This makes the FJ400 the shorter option, which may appeal to gamers seeking quicker response times and a more responsive feel. Conversely, the RedBlue allows for a deeper key press, catering to users who prefer a more pronounced tactile experience with their switches. Ultimately, your choice between these two switches may hinge on whether you value rapid actuation or a fuller depth when typing or gaming.
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 SP-Star RedBlue has an MSRP of $5.80 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the RedBlue for $5.40.
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 can be characterized as balanced, which makes it versatile for a wide range of settings, whether in a quiet home office or a bustling work environment. In contrast, the SP-Star RedBlue linear switch features a low-pitched sound that provides a bass-heavy and mellow tone. This switch also exhibits a thocky quality, delivering a deep and satisfying auditory feedback that is particularly enjoyable for those who appreciate a rich keystroke sound. Both switches offer a different auditory experience: while the FJ400 provides a neutral and adaptable sound suitable for various situations, the RedBlue delivers a more profound, thocky resonance that can enhance the typing experience.
In terms of feel, the FJ400 switch is less defined in terms of specific characteristics, while the RedBlue switch is described as mild and polished. The mild nature of the RedBlue ensures a gentle and approachable typing experience, making it suitable for users who may not be accustomed to more aggressive switch types. Additionally, the polished quality of these switches contributes to a smooth keystroke with reduced friction, helping to enhance overall typing comfort. This refined texture amplifies the tactile pleasure during use, making the RedBlue an excellent choice for those who enjoy seamless key presses. The lack of detailed feedback on the feel of the FJ400 makes it difficult to compare directly, but given the characteristics of the RedBlue, the FJ400 may lean towards a more conventional linear feel.
Overall, while both the FJ400 and SP-Star RedBlue linear switches offer unique auditory and tactile experiences, they cater to different preferences and typing styles. The FJ400’s balanced sound makes it a good all-rounder, whereas the RedBlue's low-pitched, thocky sounds and polished feel provide a specific charm that may appeal more to certain users. Until more information about the FJ400's feel is available, it's safe to say that both switches offer similar linear action, ensuring a smooth typing experience, albeit with distinct sound profiles and potential user satisfaction levels.
Conclusion
To conclude, when you're deciding between the HMX FJ400 and the SP-Star RedBlue linear switches, it's essential to consider your personal typing preferences and the environment you'll be using them in. If you're looking for a balanced experience with a medium bottom-out force that fits comfortably for both typing and gaming, the FJ400 is an excellent choice thanks to its more robust and slightly thocky sound profile. This makes it particularly well-suited for those who appreciate a satisfying auditory feedback without it being too overwhelming. Conversely, if you lean towards a lighter typing experience that feels more gentle and polished, the RedBlue switches would likely be more to your liking. With a slightly lower bottom-out force and a low-pitched, neutral sound profile, they cater perfectly to users who appreciate a smooth, mild typing experience. Therefore, if you prioritize comfort and subtlety while typing, especially in shared spaces like offices, the SP-Star RedBlue is a fantastic option. Ultimately, your choice should reflect your individual needs—whether you desire a more pronounced feedback with the FJ400 or a streamlined, easy-going experience with the RedBlue.
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