I know right if it does low to mid 40's I'll be happy. I had a HDD 15 in 5cu net and it was 145+ on music on the local audio stores dmm SPL meter. Loudest setup the owner has heard that he hasn't installed. They had a 12 12" 4th order in a ford econo van all Memphis mojo amps and sub's. He has asked me several times to come install for him. Just doesn't pay as much as my 8-5.