Trouble hearing first crack


Hi all, I am having trouble hearing first crack on my Home Ikawa. Any tips to help me hear it clearly?


Having the same problem. Three ideas: 1. Somebody at Ikawa told me to wait for multiple rolling cracks but, if any, it comes very late. 2. A roaster I trained with calls first crack at the first pop on his Ikawa. 3. If you have a profile curve, or can look at one online, first crack seems to come around 390-400F when the curve changes angle.