Sean, I'm not familiar with the Forte' other than the 4's. When these were new the rags kinda ragged on the other than 4 models. I had no idea they were that stable into lower impedances. In as much as I liked the 4's and they certainly sounded more powerful than their 50 watt rating, I really needed more power. Perhaps I've been missing out on a top quality bargain with the other models. Would you us a more detailed descritption of them from your perspective? Sorry for going off thread everyone.