HMX x 80 Retros KD400 Linear Switches

The HMX x 80 Retros KD400 Linear is a smooth linear switch designed for users who appreciate the classic HMX "clack" sound but want a deeper, fuller acoustic profile. It suits typists and keyboard enthusiasts seeking a lively, characterful sound with a smooth keystroke. This switch is less ideal if you prefer a quieter or more tactile experience.

Feel & Sound

• Delivers a smooth keystroke with reduced friction due to a slightly larger tolerance between stem and top housing.
• Produces a deeper, fuller sound compared to lighter HMX switches, adding more substance to the typing noise.
• Maintains the recognizable HMX clack character but with added depth, making it suitable for builds where audible feedback is desired.

Build Quality

• Features an M1 Strengthened POM stem, which enhances durability and smoothness.
• Uses an N3 bottom housing that contributes to the deeper sound profile.
• The L3 mold design allows for increased stem play, improving smoothness but potentially increasing stem wobble, which may affect stability.

Trade-offs

• The increased stem play that smooths the keystroke may also introduce more wobble, which some users might find less precise.
• The deeper, louder sound is less suitable for quiet environments or office settings.
• Unknown factory lubrication quality and modification potential, so additional lubing effects are uncertain.

Use Cases

• Good for typists and keyboard enthusiasts who want a smooth linear feel combined with a distinctive, audible clack.
• Suitable for builds aiming for a lively sound profile with character and presence.
• Less ideal for gamers seeking fast, quiet switches or users needing a tactile bump.