1) size of the driver is related to efficiency in producing deepest bass. But bigger drivers become problematic in transient response. Sub woofer manufacturers like REL and Velodyne make money selling a well tuned optimized home use choice to supplement less than full range speakers for the lowest bass
2) the ear is most sensitive to high frequencies. When you reduce volume below the original performance db levels the lower the frequency, the more you will feel something is missing (fullness). Inexpensive gear oft had an equalizer feature (loudness) to compensate and avoid ill will from neighbors. Audiophiles don't compromise/take it for granted music is to be played at original volume.
2) the ear is most sensitive to high frequencies. When you reduce volume below the original performance db levels the lower the frequency, the more you will feel something is missing (fullness). Inexpensive gear oft had an equalizer feature (loudness) to compensate and avoid ill will from neighbors. Audiophiles don't compromise/take it for granted music is to be played at original volume.