I have just purchased the Yamaha RXV-1400. Through the Cinema DSP processing this receiver will send an 'ambient' signal to two additional front speakers reffered to as the 'Presence' surround channels. Has anyone attempted/experienced this effect. I am considering purchasing another pair of Boston CR65's for this purpose.

The manual shows the 'Presence' speakers mounted on the wall higher and wider apart than the front mains so I am assuming that bookshelfs would suffice.

If you have tried or are using this setup was it worth it?