One comment is, if you live in a high cubic volume rectangular room with the correct dimensions for the "slam frequency range" you want, all you need is great speakers driven with enough power.
BUT... most of us don't... so just buy some $1,000 earphones and enjoy REAL bass with separation only dreamed of by those with speakers.
BUT... most of us don't... so just buy some $1,000 earphones and enjoy REAL bass with separation only dreamed of by those with speakers.