You wanted "musical bass" and those tunes above are very musical. How musical depends on how well you've tuned your system. I hear transparent growls, textures and nuances that permeate the interstitial spaces of my quarks.

Yup, the fundamental is above infrasound but some instruments have subharmonics in the infrasound range.

Yup, you're not hearing 15Hz but rather resonances.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated