Rear/Sub selectable

Hi All Anyone have experience of Sony Head units? I have a Sony CDX-GT200 Head unit and a Sony XPlod Amp in the rear, powering a Kenwood Sub. The unit advertises a rear amp/Sub selectable output from the unit. At the moment I have it set to "Rear Amp", the problem with this is that when I adjust the equalizer in the head, I.E. turn the Bass down so it doesn’t blow my Door speaker (which I think I did last night, 5h1t!!) The bass to the Sub also is attenuated. Will setting the Rear/Sub select to “Sub” bypass the equalizer, or will it turn the output into a powered out put which may damage my Amp? The manual is vague on this matter! Here is a link top the manufactures data sheet: http://www.sony.co.uk/view/ShowProduct.action?product=CDX-GT200&site=odw_en_GB&pageType=TechnicalSpecs&category=ICA+CD+Tuners http://www.sony.co.uk/view/ShowProduct.action?product=CDX-GT200&site=odw_en_GB&pageType=TechnicalSpecs&category=ICA+CD+Tuners