You may download a copy of the manual from http://www.fixya.com/support/p11535671-sony_bravia_theater_dav_hdx285_home_thea/usermanual-9F1F601-pdf
Register and download the manual for free at retrevo.com
http://www.retrevo.com/support/Sony-DAV-HDX285-Home-Theater-Systems-manual/id/23316bh343/t/2/
The TV and process the sound differently so the echo is a just a time smear. You shouldn't actually need to augment the HTS speakers with (ugh) TV speakers.
As far as comparative TV-sound loudness goes, if you drew it from the Cable Box to the audio system I'm sure it would be the same as your other audio. TV
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