It was a no knock warrant but they didn't exercise that option. They knocked and announced. Now, how loud they announced could be disputed in court because I don't know. But they did knock and announce.

Edit: and frankly the stupidest part about brianna taylors narrative is idiots who act like the cops barged in and shot her in bed while she was sleeping. She fucking got in the middle of a shootout. She caused her own death in more ways than one.