Earphone/Recording Test: LR

This app is a comprehensive audio testing tool designed to help you easily and accurately evaluate the condition of any audio equipment, including earphones, headphones, speakers, and microphones. It’s intuitive enough for everyday users yet powerful enough for audio professionals. From LR channel checks and stereo imaging tests to frequency response, noise-based evaluation, and tone generation, all essential tools are provided in one place. It is especially useful for users who want to quickly check for defects when purchasing new earphones, verify equipment before recording, or confirm speaker balance. It’s also highly recommended for podcasters, video creators, and music producers who rely on precise audio quality. ■ 1. LR Test (Left / Right Channel Test) Checks whether the left and right audio channels are functioning correctly. Clear voice prompts: “Left”, “Right” Click tone / sweep tone modes Detects cable faults, reversed wiring, or channel errors Compatible with TWS earbuds, gaming headsets, and wired earphones If you’re unsure whether your channels are swapped, this test gives an instant answer. ■ 2. Stereo Test (Stereo Image & Panning) Evaluates the stereo field using sound that moves from left → center → right. Fixed-speed and variable-speed panning Smooth/step movement options Tests space, separation, and panning accuracy Very useful for home recording, movie audio tuning, or gaming setups. ■ 3. Frequency Test (Single-Frequency Tone Test) Lets you listen to frequency responses directly. 20Hz to 20kHz tone playback Low-frequency test (30Hz, 60Hz): diaphragm/woofer integrity Midrange test (250Hz–1kHz): vocal clarity/distortion High-frequency test (8kHz–10kHz+): tweeter performance, high-end distortion Check for changes in volume, resonance, or rattling to diagnose issues. ■ 4. Balance Test (Balance Calibration) Controls left/right volume balance with precision. 0% to 100% L/R adjustment Live output changes Useful for compensating personal hearing differences If one side sounds louder, this tool helps you fix it. ■ 5. Channel Swap Test Identifies and corrects reversed left/right output. One-tap Left ↔ Right switching Works with panning and tone tests Detects device/app/cable-related inversion issues Use when audio feels reversed during playback. ■ 6. Tone Generator & Sweep Test Professional tool for generating custom tones. Sine, Square, Saw options Manual input: 20Hz–20kHz Slow/Normal/Fast sweep modes Amplitude control to detect distortion points Useful for studio monitor checking and room tuning. ■ 7. Noise Tests (White, Pink, Brown, Fan, Rain) Noise is an essential reference for analyzing audio characteristics. White Noise: even energy → checks uniform output, hiss detection Pink Noise: natural perception curve → best for tuning & balance Brown Noise: low-frequency heavy → detects subwoofer rumble/boom Fan / Rain Noise: real-world ambience → great for mic tests, ASMR, masking tests White = “shhhh”, Pink = “ss-”, Brown = “buuu—” in character. ■ 8. Recording Test (Recording & Monitoring) Evaluates microphone performance. Play test tones → record immediately Frequency spectrum analysis Noise ratio and distortion detection Supports external microphones Highly useful for YouTubers, singers, and recording users. ■ 9. Live Analyzer Professional visual tools for real-time monitoring. Peak / RMS level meters FFT spectrum analyzer Separate L/R output graphs Detects abnormal peaks or dips Perfect for users who want measurable data. ■ 10. User Presets Save frequently used combinations. “Basic Check” “Fast Earphone Test” “Pre-Recording Check” “Speaker Setup Test” Create your own preset workflow. ■ 11. Test Log & Export Store and export your test results. Date, device name, test type Save recordings Export spectrum images Generate CSV reports Great for comparison or repair documentation.