From Four 12 inch Woofers To Eight 12 inch Woofers, Will I Get Deeper Bass Or More Bass?

I have a pair of speakers that have two 12 inch woofers per speaker.  That pair of speakers are wired in a veritcal bi-amp config with 4 monoblocs.   I want to add another pair of those same speakers as fronts, but only power the woofers in the second pair with another pair of monoblocs.  The mid-range and highs will not be connected in the second pair of speakers.

The speakers with a total of four 12 inch woofers go down to 29 hz.  By adding an additional four woofers for a total of eight 12 inch woofers, will I get deeper bass, or just more bass?

This is the pair of speakers that I will be using...(or two pairs)
http://www.soundsgoodtomehouston.com/kappa9_black/kappa9_pairopen.jpg

These are the specs for these speakers.
http://www.infinity-classics.de/technik/manuals/Kappa_9_technical_sheet.pdf

This is my room.
https://systems.audiogon.com/systems/876