You are not likely to get the specific test criteria except from the manufacturer diredtly. Also, unless you have accurate testing equipment, you won't be able to confirm the accuracy anyways. Is there a specific problem that you are trying to solve? Realize that each band of the EQ has a cutoff curve and is not a singular frequency adjustment. Perhaps if you describe what you wish to know, we can provide additional details.

Also, can you confirm the make of the unit. I know of a Klark-technic DN360 but not a Koss.

Thanks,
Dan