Apple AirPods Max:
Become an expert on headphones: https://www.headphones.com/pages/research
Learn about headphone measurements and frequency response: https://www.headphones.com/pages/measurements-and-frequency-response
How frequency response impacts sound signature: https://www.headphones.com/pages/how-frequency-response-impacts-sound-signature
Source gear
SPL Phonitor X: https://www.headphones.com/products/spl-phonitor-x-headphone-amplifier?variant=376861360149
Benchmark HPA4: https://www.headphones.com/products/benchmark-hpa4-desktop-headphone-amplifier-black
Burson Audio Composer 3X Performance: https://www.headphones.com/collections/desktop-amps-dacs/products/burson-audio-composer-3x-performance-dac