Onkyo TX-SR607 receiver (available next month for $599) and you can find out, thanks to its Dolby ProLogic IIz (DPL IIz) processing. Just put a couple more speakers high and tight above your front channels, hook them up and enjoy. Onkyo is kicking off the DPL IIz craze with the midrange TX-SR607, and will be rolling the feature out across its higher-spec models over the summer. If you're not so interested in more channels, even the more modest TX-SR507 ($399) and TX-SR307 ($299) models have been refreshed with a sprinkling of more HDMI inputs and support for HD audio codecs. Hit that link for the full details.
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Onkyo TX-SRx07 receivers