Wow, now I'm going to sell all my equipment as I "can't" hear anything from 14Khz on up. But there is more to test signals than that.
Nonoise, how did you determine that you couldn't hear anything higher than that. To be accurate this really needs to be done with calibrated headphones. If you tested with computer speakers, I'm surprised you heard anything at 14KHz no matter how good your hearing! :)

