The old Infinity IRS Beta and IRS V had an electronic crossover that had a Q adjustment, which could make the bass dry as sawdust or dripping wet and bloomy. Was fun to dial in the bass transients and decay with this adjustment…however a Qts between 0.6 and 0.7 was where I settled and where most good box designs end up.Hi Michael,
Wired in series, the first bass acts as a pre-impedance. easier to drive for the amp so you increase overall quality (qts). This means that the bass plays with more sound pressure at its resonance frequency(fs). This means that the decay occurs later at a lower frequency. Unfortunately, as always, there is a disadvantage: the impulse speed becomes slower. Only you can decide whether you still like it.