On GotSound.org we are using wavesurfer.js to play sounds in a browser.
It's works only in modern browsers supporting Web Audio.
MediaElement fallback to support old browsers like Internet Explorer not always works.
You can find more information about browser supported Web Audio API here.
Please, consider to upgrade your browes to one of the following:
A distant and large boom with lots of low frequencies, used in film. Listen on appropriate speakers, on those small computer desktop speakers it will be barely audible. Maybe you can use samples DD1.mp3 and DD2.mp3 too, low rumbles to build up tension or Generator1.wav (3 versions) for a nice low evolving drone. Check my TrailerDrum pack, you might find them useful too. (Non-commercial use only.) Don't forget to donate to Freesound :-)