Is There A Device For Home Use That Can Measure How Low The Bass In My Speakers Is?

Stream white noise internet radio station and use Decibel sound meter app or similar on smartphone to measure. 

@martykl nice to see you here again.  It’s been awhile it seems. 

+1 for CDs and SPL meters. Sonic Tools on your smart phone can get you close. Free for the iphone…

FWIW, there are many tone generator apps you can download and run through your DAC. You can pick specific frequencies or sweeps. That might be easier if you have an external DAC. 

+1 to @djones51 ...dB on the SPL will tell you 'how much' vaguely, but a calibrated mic in even a eq like an 8024 Behringer will show you 'where' as well.

Used ones can be had for 100ish$ on average.

Buy a new mic, one never knows about the used ones.. Trips to the floor, the like...

Then you can play with it, if the mood strikes... ;)

Have fun, J