Mechanical Keyboard Sound Test: How Case, Plate, and Switches Affect Sound

Meta: Why do two mechanical keyboards sound completely different? This sound guide explains how case material, plate, switches, keycaps, and foam affect keyboard acoustics.

Introduction

One of the most fascinating aspects of custom mechanical keyboards is how much the sound varies between builds. Two keyboards using the exact same switches can sound completely different because of case material, plate material, foam configuration, keycap profile, and build technique. Understanding how each component affects mechanical keyboard sound lets you tune your build to your preferred acoustic signature — from a deep “thock” to a bright “clack” to a subdued “silent.” FADLIVE’s custom mechanical keyboards are engineered for a specific sound profile: deep, muted, and thocky, achieved through careful selection of aluminum cases, polycarbonate plates, and lubed switches. This guide explains each component’s role in mechanical keyboard sound.

The Sound Chain

Every keystroke creates sound through a chain of events:

1. Switch stem slides down inside the housing
2. Stem contacts the metal leaf (actuation)
3. Slider bottoms out against the housing
4. Housing transmits vibration to the plate
5. Plate transmits vibration to the case
6. Case resonates (or absorbs) the vibration
7. Sound radiates from the case and echoes off your desk

The “why” of sound inconsistency: Each component in this chain has different material properties — density, stiffness, hardness, dampening. Changing any one component shifts the entire sound profile. This is why two “identical” keyboards can sound different — tolerance variations in switches, plate mounting, and case assembly create subtle but audible differences.

Components and Their Sound Contribution

Switch Type and Sound

Linear switches: Produce a smooth “clack” or “thock” depending on other components. The sound is consistent across all keystrokes because there’s no tactile bump.

Tactile switches: Produce a two-phase sound — the bump engagement followed by bottom-out. The bump can add a crisp “pop” to each keypress. Boba U4T tactile switches are famous for their satisfying mid-pitched pop.

Clicky switches: Produce an intentionally loud “click” from the separate click mechanism. The click is the loudest component; the bottom-out sound is secondary.

Switch material sound profile:

• Nylon housing: Deeper, warmer sound
• Polycarbonate (clear) housing: Brighter, higher-pitched sound
• POM (self-lubricating): Neutral, slightly warm sound
• UPE (experimental): Very smooth, muted sound

Lubrication and Sound

Lubrication is the single biggest sound modifier for switches. Unlubed switches produce a scratchy “sandpaper” sound as the stem slides against the housing. Lubed switches produce a smooth, quiet “thock” as the lube fills the microscopic gaps between moving surfaces.

Switch sound before and after lubing:
| Switch | Unlubed Sound | Lubed Sound |
|—|—|—|
| Gateron Ink Black | Scratchy with metallic ping | Deep, creamy thock |
| Holy Panda | Scratching bump with housing noise | Clean bump with muted bottom-out |
| Cherry MX Red | High-pitched scratch, spring ping | Smooth clack, no ping |

Plate Material and Sound

The plate dramatically affects sound because it’s the direct attachment point for switches. Vibration from the switch travels directly into the plate.

• Polycarbonate plate: Softer, dampens high frequencies, produces deeper “thock” sound
• Aluminum plate: Balanced, produces moderate sound with some ping potential
• Brass plate: Very stiff, amplifies high frequencies, produces bright, loud sound
• Carbon fiber plate: Lightweight, unique ringing sound, rare
• FR4 (fiberglass) plate: Balanced, similar to aluminum but slightly warmer
• No plate (plateless build): Maximum flex, unique hollow sound, very quiet

FADLIVE’s plate choice: Polycarbonate plate paired with aluminum case. This combination produces the deepest “thock” because PC dampens high frequencies while aluminum absorbs vibration rather than amplifying it.

Case Material and Sound

• Aluminum: Absorbs vibration, produces deep, muted sound. The densest and most dampening case material.
• Polycarbonate: Transmits more vibration, produces warmer, slightly hollow sound with more resonance.
• Acrylic: Very resonant, produces bright, hollow “clack” with pronounced overtones.
• Wood: Very warm, deep, muted sound. Absorbs more noise than any plastic or metal case.
• Brass: Bright and loud, amplifies high frequencies. Heavy case acts as a resonance chamber.

Mounting Style and Sound

• Gasket mount: Decouples plate from case, reduces vibration transfer, produces deeper, muted sound
• Tray mount: Direct connection transmits all vibration, produces brighter, louder sound
• Top mount: Moderate isolation, produces crisp, defined sound

Keycaps and Sound

• PBT keycaps: Denser than ABS, produce deeper, lower-pitched sound
• ABS keycaps: Lighter, produce crisper, higher-pitched sound
• SA profile: Tall, thick keycaps produce the deepest “thock” of any profile
• Cherry profile: Moderate height, balanced sound
• OEM profile: Taller than Cherry, slightly higher-pitched sound

Sound Configuration Guide

For Deep “Thock” Sound

Components:

• Aluminum case
• Polycarbonate plate
• Lubed linear switches (Gateron Ink Black, Alpaca)
• PBT SA keycaps
• Gasket mount
• Case foam (thin EVA or PE foam)
• Plate foam (between plate and PCB)
• Desk mat (absorbs bottom-out resonance)

FADLIVE recommendation: This is exactly how FADLIVE’s custom mechanical keyboards are configured. The combination produces the deepest, most satisfying “thock” available.

For Bright Clack Sound

Components:

• Acrylic or brass case
• Brass or aluminum plate
• Lubed tactile or clicky switches
• ABS Cherry or OEM keycaps
• Tray mount (no foam)
• No desk mat (keyboard on hard surface)

For Silent Operation

Components:

• Gasket mount aluminum case
• Polycarbonate plate
• Silent linear switches (Silent Alpaca, Boba U4)
• Multiple foam layers
• PBT keycaps
• Desk mat
• O-rings on switch stems (for bottom-out dampening)

Sound Test Methodology

How to Compare Keyboard Sounds

1. Record in a quiet room
2. Same keypress force for each test
3. Same key position (center switch, not edge)
4. Standard keycap on the test switch
5. Record from the same distance (30cm from keyboard center)

Common Descriptions

• Thock: Deep, resonant sound like tapping a wooden block. Preferred by most enthusiasts.
• Clack: Crisp, clean sound like tapping a plastic ruler on a desk. Preferred for precision feel.
• Creamy: Smooth, buttery sound with no sharp edges. Lubed linears sound creamy.
• Ping: Metallic ringing from spring vibration. Unwanted sound that indicates unlubed springs.
• Rattle: Loose wire sound from untuned stabilizers. Unwanted.
• Hollow: Echoey sound from empty case cavity. Common in tray mount builds without foam.

FAQ

Does switch sound change over time?

Yes. Switches “break in” over 2-4 weeks of use. The sound may become slightly quieter or warmer as plastic wear-in creates smoother surfaces. The sound should not become scratchier — if it does, the switch needs cleaning and re-lubing.

Can I make my keyboard quieter?

Yes. Add case foam (PE, EVA, or silicone), use O-rings on switch stems (for bottom-out dampening), switch to silent linear switches, and use a desk mat. The quietest custom mechanical keyboard configuration is a gasket mount aluminum case with Boba U4 silent tactile switches and multiple foam layers.

Do ortholinear keyboards sound different from staggered?

Slightly. Ortholinear keyboards have consistent key spacing, which produces more uniform bottom-out sounds. Staggered keyboards have varying distances between switch and keycap, creating small variations in sound per row.

What’s the best microphone to record keyboard sound?

For accurate keyboard sound recording, use a dynamic microphone positioned 30cm from the keyboard center at a 45-degree angle. Avoid condenser microphones (too sensitive) and USB desk microphones (pick up desk vibrations through the stand).

Tags and Keywords

mechanical keyboard sound, keyboard sound test, keyboard acoustics, thock sound, mechanical keyboard thock, keyboard sound guide, plate material sound, case material sound, switch sound comparison, keyboard mod sound, lubed switch sound, FADLIVE keyboard sound, keyboard sound tuning, custom keyboard acoustic, mechanical keyboard noise