Why do deeper octaves sound louder than higher octaves?

Deeper octaves sound louder than higher octaves primarily due to the way human hearing perceives frequency. Our ears are more sensitive to lower frequencies, which can create a perception of greater loudness. Additionally, lower frequencies have longer wavelengths and can produce more energy in a given space, making them seem more powerful. This combination of physiological sensitivity and acoustic properties contributes to the perception that deeper octaves are louder.