BEST NARROW-BODY ENGINE START-UP EVER! SPEAKERS/HEADSET - VOLUME UP 🔊🔊

I’ve flown the IAE powered A320 and A321 many times before and the start-up from inside is always a ‘boomer’!
Compared to the CFM56 and even the Next Gen LEAP and GTF engines, this has the best ‘booming’ start-up ‘tune’.
The ‘boom’ you hear is actually the Igniters firing-up the Combustion Chamber inside the engine.