A single sub, if located properly AND large enough to excite the OPs 3000 cubic feet would be fine.
My room, larger in all dimensions, and irregularly shaped, is fine with a 12" sub with 'only' 250 watts. It is a HSU Research VTF 2/III.
And even though not rated, it will reproduce the 16hz pedal tone on the Saint Saens symphony #3, 'with organ'.
You can't localize much below 80hz in a normal home space. Like the OK restaurant doing land office business? Location, Location, Location.
The question for me, when I bought, was if I could afford a pair of subs or a single better sub? If I'd had the $$$, the purchase of a pair would have been online.
My room, larger in all dimensions, and irregularly shaped, is fine with a 12" sub with 'only' 250 watts. It is a HSU Research VTF 2/III.
And even though not rated, it will reproduce the 16hz pedal tone on the Saint Saens symphony #3, 'with organ'.
You can't localize much below 80hz in a normal home space. Like the OK restaurant doing land office business? Location, Location, Location.
The question for me, when I bought, was if I could afford a pair of subs or a single better sub? If I'd had the $$$, the purchase of a pair would have been online.