@craigert
The Classe Sigma 2200i class D amp does not sound like your Pioneer receiver at all. They did not sound closed in. In fact it puts out big soundstage with very good separations between instruments and vocals etc. To be honest, I myself not a big fan of class D amp either and this won't be my choice for music. But it will sound much better than any receivers or entry level integrateds or separates.
The Classe Sigma 2200i class D amp does not sound like your Pioneer receiver at all. They did not sound closed in. In fact it puts out big soundstage with very good separations between instruments and vocals etc. To be honest, I myself not a big fan of class D amp either and this won't be my choice for music. But it will sound much better than any receivers or entry level integrateds or separates.