My 75 year old father and I used them at the Martinsville Speedway where there is constant noise. They blocked out car noise as well as foam ear tips and the intercom was amazing. The microphones didn't pick up the sounds of the tracks and allowed us to communicate as easily as if we were sitting in the living room. We've rented popular ('RE) tracks that sell for $500+ and work way better. They connected to my Uniden scanner and the volume was great and I didn't have to buy an amp like you do with other track headphones. If they work this well in Martinsville, they will work at any circuit. I would recommend these to anyone unless you have a few hundred bucks and don't want the brand to be on everyone else, but they don't work as well as these for less money. I have used both and they are worth it.
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