Use Your Ear vs AET Quiz

The 9 pivot points: · **50 Hz** — Depth & Weight · **100 Hz** — Warmth & Punch · **200 Hz** — Thickness & Mud · **500 Hz** — Boxy & Gargle · **1 kHz** — Nasal & Knock · **2 kHz** — Edge & Clarity · **5 kHz** — Presence & Bite · **10 kHz** — Sizzle & Snap · **20 kHz** — Air & Plastic Each pivot mapped to perceptual adjectives — so you don't just memorize numbers, you learn what they SOUND like. Four training modes: EQ Workbench — Interactive 9-band parametric. Drag nodes vertically for gain, scroll wheel for Q, double-click to reset. Frequencies are locked to the pivot points (that's the whole point). Quiz — Blind pivot trainer. The app boosts or cuts a random pivot on pink noise at Easy / Medium / Hard difficulty. A/B between processed and bypass, then pick the frequency + direction. Scoring tracks your accuracy over time. Listen — A/B reference mode. Set gain and Q on a single pivot, toggle A/B against bypass, and read the "Boost to..." / "Cut to..." cheat sheet. Train your ear by hearing the same EQ move at multiple frequencies. Sweep — Manual sine tone across the spectrum, plus an automatic logarithmic sweep from 20 Hz to 20 kHz with the nearest-pivot readout. Hear the spectrum, build the mental map. Sources: · Pink noise (Paul Kellet generator, 4-second loopable buffer) · Sine tone · Log sweep · Your own audio file · Live microphone (with feedback warning) Hearing safety built in: Three independent ways to instantly stop audio: 1. Mute button — instant silence, playback can resume 2. Stop button — tears down the audio source completely 3. Always: keep your master volume LOW, use headphones at safe levels Sine tones and sweeps are internally attenuated to 15% of full scale. Why is it free? Tomorrow's working sound engineers are today's audio students. We want you to learn properly — not paywalled, not gated, not crippled. No ads. No data harvesting. Just a real tool. Where next? · Surviving Audio — Plan and design PA systems before the show · Soundtools Pro — Real-time tools during the show Three apps, one story: train, plan, execute.

A quiz app for practicing audio engineering calculations with randomly generated questions. No login, no ads, no tracking — works completely offline. ■ Electrical · Ohm's Law (current/voltage) questions · Power (P=V×I) questions · dB ↔ power ratio conversion questions · Speaker impedance (series/parallel) questions ■ Delay · Speed of sound by temperature questions · Distance ↔ time delay questions · BPM-based note length questions · Haas effect (precedence effect) zone questions · Multi-zone speaker delay (with precedence offset) questions ■ Acoustics · Wavelength (λ) questions · Period questions · RT60 reverberation time questions · SPL falloff by distance questions ■ Tempo & Pitch · Playback speed ↔ pitch (semitone) conversion questions · Loop BPM questions · Buffer size / sample rate latency questions ■ Mixed · Combined questions from all four categories above Choose 5, 10, 15, or 20 questions per round — a fresh set of random questions every time. Each answer comes with an instant explanation showing the formula, and you can track your round progress, hit count, and accuracy in real time. Available in Korean, English, Japanese, Spanish, Simplified Chinese, German, Brazilian Portuguese, and French. Runs on iPhone, iPad and Mac