What does detonation sound like?

Right now im running 16 intial 36 total the all in around 2200 iirc maybe it was 2500 I got it wrote down somewhere. I am running plug that is one step colder than stock right now
But WHERE does it STOP advancing? It's all IN by 2200-2500.....whatever but is that as FAR as it goes? If you've done nothing to limit it, it probably advances more.

All that said, 16 initial doesn't sound like too much.......unless maybe you're running 87 octane.