BTW, if you want to be more assured of hearing, and feeling 20Hz, the 500 is the way to go because it is flat down to 20. This means your room will boost it to likely twice as loud (10 dB) as the micro.

Unfortunately, you can't possibly know unless you try both. So maybe consider an in-home showdown and a return.

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