The Quatro is basically a Model 3A Sig with a scaled down version of the 2Wq sub-woofer built-in (only 2 active drivers, no radiator). IMO a better option would be to get a pair of Model 3A Sigs and a pair of 2Wq subs. You get the full scale 2Wq, the ability to independently place the subs and you save about $850. Or $4.5K, if you were looking at the wood veneer option.