How to Test ANC Performance at Home: 7 Simple DIY Tests to Measure Active Noise Cancellation on Headphones and Earbuds

Introduction

Active Noise Cancellation (ANC) technology promises to reduce unwanted background sounds, but not every device delivers the advertised performance. This guide explains how a user can objectively evaluate ANC at home using seven straightforward tests. The reader will learn how to create a reliable baseline, measure attenuation across different frequencies, and verify real‑world usability. Understanding these methods empowers one to make informed purchasing decisions and to troubleshoot issues without requiring expensive laboratory equipment.

What You'll Need

• A quiet room and a separate noisy environment (e.g., a kitchen blender, a fan, or traffic noise).
• Smartphone or tablet with a decibel (dB) meter app.
• Bluetooth‑enabled headphones or earbuds.
• Optional: a reference device for comparison.
• One of the following products to streamline the process:

• Soundcore Q20i ANC Headphones – $44.99, 4.6/5 rating.
• Sony WH-CH720N Wireless Headphones – $73.30, 4.4/5 rating.
• Soundcore Space A40 Earbuds – $59.99, 4.2/5 rating.
• Raycon Everyday Earbuds – $67.99, 4.3/5 rating.

Step‑by‑Step Instructions

Step 1 – Establish an Ambient Sound Baseline

Before testing any ANC device, record the ambient noise level in the environment where the test will occur. Open a reliable dB meter app on a smartphone and place the device on a stable surface, microphone facing upward. Record the reading for at least thirty seconds while the room remains quiet. This baseline figure will serve as a reference point for later comparisons. Using a consistent location for all measurements eliminates variables such as room acoustics.

While this step does not require a specific product, having a pair of well‑reviewed headphones such as the Soundcore Q20i ANC Headphones ensures that the user can verify that the device does not introduce additional noise when ANC is disabled.

Step 2 – Test Passive Isolation

Passive isolation refers to the amount of sound blocked by the physical design of the headphones or earbuds before ANC is activated. Place the chosen device on the head or in the ears, ensure a snug fit, and repeat the dB measurement with ANC turned off. Compare this reading to the ambient baseline. The difference indicates how much sound is blocked solely by the ear cups or ear tips.

The Soundcore Space A40 Earbuds feature an ergonomic shape and lightweight design that many users report as comfortable for long sessions, making them an excellent choice for evaluating passive isolation.

Step 3 – Measure ANC Attenuation at Low Frequencies

Low‑frequency sounds such as engine rumble or air‑conditioner hum are common targets for ANC. Generate a steady low‑frequency noise using a fan or a smartphone tone generator set to 100 Hz. Record the dB level with ANC disabled, then enable ANC and record again. Subtract the second reading from the first; the resulting value represents low‑frequency attenuation.

The Sony WH-CH720N Wireless Headphones employ Dual Noise Sensor technology and an Integrated Processor V1, which are specifically engineered to excel at low‑frequency cancellation. Their lightweight 192 g construction also ensures that the user can wear them for extended testing periods without fatigue.

Step 4 – Measure ANC Attenuation at Mid‑Range Frequencies

Mid‑range frequencies (500 Hz‑2 kHz) include human speech and many environmental sounds. Use a smartphone to play a spoken passage or a recording of a conversation at a consistent volume. Measure the ambient level, then repeat with the headphones in passive mode and finally with ANC active. The difference between passive and active readings reveals the contribution of ANC in the mid‑range.

The Soundcore Q20i ANC Headphones provide 40 mm dynamic drivers and BassUp technology, delivering detailed mids that make it easy to discern changes when ANC is applied.

Step 5 – Evaluate Transparency Mode

Many modern ANC devices include a Transparency or Ambient mode that allows external sounds to pass through. Activate this mode and repeat the mid‑range test from Step 4. The dB reading should rise, indicating that the device is intentionally letting ambient audio in. This test confirms that the feature works as advertised and helps the user decide whether the mode is suitable for activities such as walking in traffic.

The Soundcore Q20i ANC Headphones offer a dedicated Transparency mode that can be toggled via the Soundcore app, providing a convenient way to compare full ANC with ambient awareness.

Step 6 – Conduct Real‑World Scenario Tests

Laboratory measurements are useful, but real‑world performance determines user satisfaction. Simulate common situations such as commuting on a train, working in an open‑plan office, or watching a movie on a laptop. For each scenario, note subjective impressions (e.g., clarity of dialogue, perceived bass, comfort) and record dB levels if possible. Document whether ANC remains stable when the device switches between Bluetooth sources, a feature highlighted in the Soundcore Q20i ANC Headphones through their dual‑connection capability.

The Raycon Everyday Earbuds are IPX4 rated for sweat and water resistance, making them suitable for testing during exercise or outdoor activities where moisture may be a factor.

Step 7 – Verify Battery Life Impact on ANC

ANC can consume additional power, potentially reducing playback time. Fully charge the device, enable ANC, and start a continuous playback of a neutral track. Record the time until the battery indicator reaches 20 %. Repeat the test with ANC disabled. Compare the two durations to understand the trade‑off between noise cancellation and battery longevity.

Both the Soundcore Q20i ANC Headphones (40 hours with ANC on) and the Sony WH-CH720N Wireless Headphones (up to 35 hours with quick charge) provide ample runtime for extended testing, yet the measurement will reveal any noticeable difference.

Tips & Pro Tips

• Perform each test at the same time of day to minimize variations in ambient noise.
• Use the official companion apps (Soundcore app for Q20i and Space A40, Sony Headphones Connect for WH‑CH720N) to ensure firmware is up to date.
• When testing earbuds, select the correct ear tip size for a proper seal; this dramatically influences both passive isolation and ANC efficiency.
• Document results in a spreadsheet; include columns for device, test type, ambient dB, passive dB, ANC dB, and subjective notes.
• If possible, repeat each measurement three times and calculate the average to reduce random error.

Troubleshooting

Issue: ANC does not appear to reduce noise.

Solution: Verify that the ANC toggle is enabled in the device settings or companion app. Ensure that firmware is current, as older versions may contain bugs that disable the microphones.

Issue: One earbud stops receiving ANC while the other continues.

Solution: Remove the earbuds from the charging case, inspect the contacts for debris, and reseat them. Reset the earbuds via the app and re‑pair them to the source device.

Issue: Battery drains rapidly when ANC is active.

Solution: Reduce Bluetooth transmission distance, disable unnecessary features such as voice assistants, and consider using the fast‑charge function (5 minutes for 4 hours on the Q20i).

Conclusion

By following these seven DIY tests, a user can objectively assess the ANC performance of headphones and earbuds without specialized equipment. The guide demonstrates how to measure passive isolation, low‑ and mid‑frequency attenuation, transparency mode effectiveness, real‑world usability, and battery impact. Armed with this knowledge, one can compare devices such as the Soundcore Q20i ANC Headphones, Sony WH-CH720N Wireless Headphones, Soundcore Space A40 Earbuds, and Raycon Everyday Earbuds with confidence. The systematic approach also helps identify any defects that may warrant warranty service or replacement.

Products Mentioned in This Guide

Frequently Asked Questions

How can I create a baseline measurement for ANC testing?

Measure ambient noise levels in the room without headphones using a dB meter app, then record the same location with the ANC device off to establish a reference point.

Which frequency ranges should I test when evaluating ANC performance?

Focus on low (100‑300 Hz), mid (500‑1500 Hz), and high (2‑4 kHz) frequencies, as most ANC systems vary in attenuation across these bands.

Do I need a professional dB meter app, or are free apps sufficient?

Free dB meter apps are adequate for DIY tests, provided they are calibrated or validated against a known sound source.

Can I compare ANC performance between headphones and earbuds using the same DIY tests?

Yes, run the same set of tests (baseline, frequency sweeps, real‑world noises) on each device to directly compare attenuation levels.

What are common signs that my ANC is not functioning properly?

If the dB reduction is less than 5‑10 dB in low‑frequency tests or you still hear constant background hums, the ANC may be defective or improperly sealed.