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I sent a email to krell and got this email.... Yes Mike, you can use the RCA pre-amp output for the sub input. This output will be 6 db down in gain compared to the balanced XLR output. So this difference will need to be added at the sub woofer amplifier. Steven Leckrone Senior service technician Krell Service Department Looks like I am ok, easy solution, thanks for the post............Mike

bump also....I have no sub output on my amp, anyone have a link to a diagram to hook up the sub to the amp, as I understand it a splitter is needed. thanks........headed towards the ed a7s

ok,....so, I have 8 foot ceilings and that puts be close to 3,000 cubic feet. Music is my priority, HT second....I have been looking hard the ED a7s-450 sealed 18 inch. Any thoughts...thanks to all those who answered. Mike

I guess I am worried about overkill, or is it just a matter of buying the best sub that is in your price range. I am leaning towards somethig that would be better for music than movies. Been looking at the mfw-15, Ed-a5-350 and the epik caliber. Anybody have any advice in the difference in these, or something I may be missing, thatnks all.....Mike

hello, first post here. I have been wanting to buy a subwoofer for my living room. I have a Krell 300i intregated amp with a pair of klipsch R-7's. Will be for music and movies 50/50, my room is 14x26, hardwood floors, typical living room. I am looking to spend around $800, give or take. Not sure how much subwoofer I need. asking for some help in narrowing it down to a few options..........thanks in advance, Mike