Spatial Audio Preview vs Level

Spatial Audio Preview is a focused tool for hearing exactly how Apple's spatial audio renderer handles your files. Load any audio or video file and switch between Apple's Music and Movie spatial rendering profiles in real time. Spatial Audio Preview reads your file's true format — sample rate, bit depth, channel count, and channel layout, including Dolby Atmos and multichannel surround layouts — and shows you exactly what's playing. The app also tells you whether your connected output (AirPods, Beats, or other accessories) actually supports spatial audio rendering, so you always know if what you're hearing is spatialized or just raw channels being played back. Features: • Switch between Music and Movie spatial rendering modes on the fly — the same modes used by Apple Music, Apple TV, and more. • View info on the current file, such as sample rate, bit depth, channels, and layout. • Play back audio in several channel layouts, including stereo, surround, and Dolby Atmos. • See if your device and headphones support spatial audio playback. • Background playback with lock screen and Control Center controls allow you to listen with the device locked or unlocked. • Spatial Audio Preview is built with accessibility in mind with a VoiceOver-first interface. Spatial Audio Preview doesn't collect, transmit, or store any of your data. Everything happens on your device. Supported file types: • WAV • AIFF • CAF • M4A • MP4 • MOV Supported channel layouts: • Mono • Stereo • Quadraphonic • 5.0 • 5.1 • 6.0 • 6.1 • 7.1 • 5.1.2 • 5.1.4 • 7.1.2 • 7.1.4 • 9.1.6 • Dolby Atmos (E-AC-3) • Dolby Digital (AC-3)

Level is a fast, honest sound-level meter for iPhone. A big live decibel reading, plus Leq, Min, L90, and Peak alongside it — toggle on only what you need. A built-in reference generator and calibrated-mic support are there for speaker work or true SPL. One clean instrument, not a busy suite. FEATURES Big decibel reading — A/C/Z weighting, Fast (125 ms) or Slow (1 s) response Four toggleable stats in a 2×2 grid: Leq (energy-average), Min (quietest moment), L90 (background level — exceeded 90% of the time), Peak (true instantaneous peak). Always computed; show only what you need Peak-hold "Max" — a marker holds the loudest moment; tap to reset Reference signals: pink noise, white noise, ten octave tones (31.5 Hz–16 kHz), level-matched. 1 kHz tone pairs with a 94 dB calibrator Play any output — iPhone speaker, AirPlay, Bluetooth, or USB — while the meter keeps reading Calibrated-mic support: Dayton iMM-6C, miniDSP UMIK-1/UMIK-2/EARS, Behringer ECM8000, REW. Frequency correction plus a true-SPL anchor from the file's 1 kHz sensitivity Manual calibration offset Share card — current reading, your enabled stats, and the level bar Full VoiceOver support No account, no analytics, no third-party SDKs, no in-app purchases, no network connections HOW IT WORKS Open Level, allow the microphone, and read the room. Turn on Leq, Min, L90, and/or Peak in Settings → Readings to see them beside the live number in a 2×2 grid. Tap the meter to reset Max and every stat. For speaker work, tap play to send a reference signal to any output — pink noise for level-setting, white noise for tweeters, an octave tone for room modes, or the 1 kHz tone against a 94 dB calibrator. Long-press play (or use Settings) to switch. With the built-in mic, readings are approximate but honest and well-behaved. A calibrated USB mic and its cal file give true SPL. Either way, Level is a measurement tool, not a certified Type 1/2 instrument. GREAT FOR Checking if a room, party, nursery, or workspace is too loud Home theater/hi-fi — matching channels, setting levels, dialing in a subwoofer Car audio — matching and balancing components Live-sound hobbyists and DIY speaker builders Anyone who wants an honest number, without a pro measurement suite PRIVACY Audio is measured live only — never recorded, written to disk, or transmitted. No account, no analytics, no in-app purchases, no network connection at all. QUICK START Open Level, allow the microphone Read the big number (A-weighted by default) Settings → Readings: turn on Leq/Min/L90/Peak to add them to the grid Tap the meter to reset Max and every stat For speaker work: tap play to send a reference to any output; long-press to switch signals IMPORTANT Level is a general-purpose meter, not a certified Type 1/Type 2 instrument. Built-in mic readings are approximate; a calibrated USB mic with a cal file gives true SPL.