Originally Posted by K4IHS
I've found it's hard to hear the low volume scanners at the track even with a nice racing headset.
Try an audio booster like this one
from Racing Electronics. I bought one from them at the IndyCar race at Barber Motorsports Park last weekend and got a free splitter and battery with it. With the Koss QZ-99 headphones my son and I used, that audio booster boosted the volume on my PSR-500 so well that I only had to turn up the volume just a little more than no volume at all. Anything more than that was WAY too loud.