I have been using (and integrating) sub woofers in my music audio systems for years, 2.1 systems in the past, my current setup is a 2.2 setup, with a pair of identical models (both purchased new at the same time).
Though low bass sounds have a very long wavelength, so long it's difficult if not impossible to sense the direction they are coming from, I have found that having a pair of sub woofers gives the "visceral" experience of directionality to the bass, so I'd recommend installing a pair of subs of the same model.
Though low bass sounds have a very long wavelength, so long it's difficult if not impossible to sense the direction they are coming from, I have found that having a pair of sub woofers gives the "visceral" experience of directionality to the bass, so I'd recommend installing a pair of subs of the same model.