Years ago at Knotts Berry Farm they had a graveyard. One grave you put your foot over and you could feel a heart beat through the ground. How can I replicate this???
A little bit pricey but a bass thumper would work. It's used in car audio. You stick it under the seat and it thumps to the bass. It gives the impression that the woofer is stronger than it really is.
beating heart grave
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