It 's nine DB ?
Yeah. Yeah. Um  And actually it brought up a question which may be relevant to the Aurora stuff too. Um , I know that when you figured out the filters that we 're using for the Mel scale , there was some experimentation that went on at  at , uh  at OGI. Um , but one of the differences that we found between the two systems that we were using ,  the  the Aurora HTK system baseline system  and the system that we were  the  the uh , other system we were using , the uh , the SRI system , was that the SRI system had maybe a , um , hundred hertz high - pass. And the , uh , Aurora HTK , it was like twenty.
Yep. S sixty - four.
Uh.