-20 DB Volume Measurment

I play my music in the 85 db range on my db meter on my phone. Comfortable but in the range of live music at a concert (except The WHO). The music has transient peaks at 90 db. On the volume knob of my Benchmark pre-amp this equates to a volume level of -20DB give or take. Does that mean my amp has another 20DB to go before the amp hits peak power output and starts to clip?