My take : the choice is not a simple binary choice for one sub versus two subs .
A key determinant is the build quality and parts in the unit(s) . since it is the subwoofers) in both of these situations that tends to call attention to the system and cause many of the problems thatmay be predicated .
One good unit is is better than two cheap units IMO.
The truth of the matter is that most subwoofers have fully earned their bad reputation. They usually suck. Most of them sound boomy, muddy and out of control with an obnoxious bass overhang that lingers so long as to blur most of the musical information up until the next bass note is struck. The cheap built ones as the mass-market models trying to capitalize on the home theater trend that is sweeping the land, and these are a big (and IMO, unacceptable… ) performance compromise for 2-channel Audio .
That is why I auditioned all the contenders and all-too-many pretenders, and bought the ATC C1MK2 subwoofer because for two reasons:
(i); its superior audio performance that integrated seamlessly with my HARBETG main speakers that’s bested all the others in my system.
(ii) It’s superior superior quality build and warranty
- Compact 12″ Sub
- Handmade ATC 12″/314mm driver with massive motor assembly and ribbon voice coil
- ATC 200W full class A/B amplifier
- High Level and Line Level Inputs
- Comprehensive user controls to ensure best possible integration with partnering loudspeakers
- 6 Year warrantY
- Of course, this costs and it ain’t cheap = Choose wisely