Anyone has a good advice on how to blend XS15 (non-SE) for stereo 2.1 music into my humble setup of Harmon Kardon HK 3490 stereo receiver with line-level Sub Out but no bass management. I have to use crossover on the XS15. Speakers are NHT SuperOne bookshelves with lows being around 80Hz. I cannot find a good test tracks to use for that or any settings that will work. So far after a LOT of trial and error, the XS15 underwhelm big time right now but I know it is due to settings. I did all the drills from the manual but I think I missing a big trick somewhere because my setup is stereo receiver not typical HT.