About The Audio Toolkit

Free, professional grade audio tools and reference guides for live sound engineers.

Who's Behind This

A touring FOH engineer. These tools cover practical live sound calculations: delay and speaker alignment, dBu/dBV/dBFS conversions, recording storage, loudspeaker limiter settings and BPM-to-ms sync, plus EQ ear training and hands-on wiring references for XLR and SpeakON.

Why This Exists

  • Works offline: Service worker caches pages and assets so the tools are usable without an internet connection.
  • Mobile layout: Calculators stack into a single column on small screens, with 48px inputs and selects.
  • No tracking: Zero analytics, zero cookies, zero third-party scripts. Your calculations stay on your device.
  • Pro references: Formulas based on established audio engineering principles and industry standards (IEEE, IEC, EBU).
  • Shows the math: Every tool displays the formula and explains the "why", not just the answer.

Current Tools

  • EQ & Feedback Ear Training: Name the Boosted Band plays audio with one band lifted and you identify it from four candidates. Find the Feedback plays a sine tone at one band and you locate it by moving faders on a 1/3-octave graphic EQ. Room effect simulation included.
  • Audio Delay Calculator: Distance ↔ ms ↔ samples with temperature/humidity compensation. Subwoofer alignment + delay tower Haas alignment.
  • dBu to dBFS Converter: Convert dBu to dBFS using European broadcast, SMPTE RP 155, or other broadcast standards. Also handles dBV and volts. Add multiple sources. Selectable digital reference.
  • Recording Storage Calculator: Any sample rate, bit depth, channel count, duration. Common capacity quick-select. WAV/FLAC/MP3 estimates.
  • Limiter Settings Calculator: RMS, program, and peak limiter thresholds from loudspeaker specifications, with amplifier gain compensation and attack/release recommendations.
  • BPM → Millisecond Calculator: Convert BPM to delay, reverb pre-delay, and tempo-synced times in milliseconds. Tap tempo for live detection, plus a reverse millisecond → tempo finder.

More tools coming based on search demand and real-world needs.

Guides

The XLR Soldering & Pinout Reference and SpeakON Wiring Reference are available now. Additional guides on topics like MIDI for live sound, gain structure, and cable types are coming soon.

Related Projects

  • MIDItoAppleScript: A free native macOS app that maps MIDI controllers to AppleScript. Trigger scripts, control apps, and automate your show from any MIDI device. Built for Apple Silicon.

Tech Stack

  • Plain HTML, CSS, JavaScript: no frameworks, no build step
  • Hosted on Cloudflare Pages (free tier)
  • Domain: theaudiotoolkit.com (Cloudflare registrar)
  • Service worker for offline caching
  • Statically served HTML for fast loading and SEO (no JS-only content)