My Sonus Faber Amatis have weak bass even though I'm running ML 536s--800 w/ch into 4 ohms


I don't know what I'm doing wrong. I thought the new monos would solve the problem. I still have to use subwoofers to feel like my system has any bass. I've tried speaker placement but to no avail. I realize it could be room issues, but short of packing my room pull of room treatment, there has to be something else. The drivers work, it just doesn't sound full. Should I get a different speaker? At this price, I expected more.

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One wall is windows. Floors are wood, but covered by a rug. Plenty of furniture in room. 

They sound great. They just have no bass. The second I turn on the KC 62s the sound is 10x better. I can't believe two $1500 subs make the sound that much better than the MLs and the SFs alone. I must be doing something wrong. 

It's like the whole system comes alive when the subs are added. I guess I just thought that with the Sonus Fabers and the ML 536s I wouldn't need subwoofers.