i do have some organ CDs where bass frequencies go down only to around 32 Hz or higher;
at least one of them goes down to 7 Hz.

that's a whole world of difference when you listen to them.

if you want it all, then you should get the sub (s) that goes the lowest in frequencies, with high output.
the HT room size will also make a difference: small rooms reinforce the very low frequencies more than large rooms will.