I have not heard the Fontaines, but use the Isabels as rear channel speakers (Andras in front). I listened to the Isabels as front channel speakers for about 2-3 hours, driven by my front channel amps, Classe CAM-350 monoblocks (350 watts/channel), and threw some big orchestral stuff at them. They sounded beautiful--surprisingly large soundfront, quite full, very detailed. Compared to the Andras, they don't project deep bass, but, put within a foot of the rear wall, as recommended, they don't sound bass-shy either. In a reasonable-sized room, 20-22' X 11-13', I would try them first without the subwoofer. But they're like all Eggleston speakers: they love power. Don't even bother trying them with less than 100-150 very good watts a side.
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