As lovinthehd said, these speakers are meant to be used with that system and vice versa. Most standalone speakers and subwoofers can be used with most standalone AVRs, but some home-theater-in-a-box systems like this one don't work like that. 2.7 ohms is a very low resistance load for typical AVRs, especially considering these are going to be on the lower side of sensitivity. If you want something better, you need to start over again from scratch. You will not even be able to use the speaker cables from this system as they are likely to high gauge for real speakers.