I have loaded a test cd(autosound 2000 CD104 http://www.autosound2000.com/Products/cds/index.htm )with 40hz 100hz 400hz 1khz 4khz 8khz tones at various levels 0db,-5db,-10db,-15db to acomplish the same thing.Actually i havent put it on the player yet so i dont know how it will work.