Actually one of the members went in for an underseat subwoofer quite recently. Apparently he is quite happy with his decision. He too I suppose bought it from snapdeal. His user id is winimation, IIRC. Just search in the search bar. Yet another suggestion guys, after a recent speaker upgrade, I had faced similar issue. It happened so that a wire was touching the rear of the speaker and seriously compromised the SQ and would also cause jarring at higher volume. Initially, for a brief moment I thought the speaker was faulty , but on inspection it turned out to be a wire hanging loose touching the speaker driver. Just retaped it back to place and things were very smooth later. Check the installation again. Please check the forum for Wuerth Dampening. They are providing comparatively economical dampening materials, AFAIK.