Exactly what I've experienced. I thought my Heresy's sounded awful on the floor. They're elevated about 18" and I use a single PSB subwoofer--much better sounding to my ears. Theory is fine, but living with what you like best is what it's all about. I have a lot of experience with different speakers, amps and sources, from single-driver full-rangers to electrostatics, from vinyl to DACs, tubes to Tripath, so I have been able to compare. The only long-term constants in my system have been the my Heresy's and my Denon DL-103, which I find kind of amusing, since they're both fairly old designs and represent the very ends of the audio chain.