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Hi Ken Larson, since very low bass frequencies are omni-directional (60 c.p.s. and lower), a sub-woofer located below the yards or station might be a solution for the sub-sonics (rumble) of an EMD at idle. On board (QSI, etc.) is truly impressive but if you want "living presence;" when you "feel" the sounds under your feet- -there is nothing quite like a quality sub-woofer. Then all you need is an old cofee can with a drop of kerosene [diesel perfume] in it and VOILA! "You Are There!" LOL, TDK
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