Stratman,
I think you're looking at the amp "Power" page, which shows "Power Amp Low Cut" and "Power Amp Hi Cut". Grape is referring to the "Tone" page (one down) values for "Low Cut" and "High Cut". It's one below the "Power" page.
No, Stratman was right. He was looking at the Amp Tone section for a Wrecker and the defaults for that amp are 10-20000. Each amp has its own defaults which I didn't realize until he posted.
PS
I've done some more research and it appears that more often than not, the lo/hi cut for my presets are set to the default. Only a few presets benefitted from changing it to full range. I'm updating the top of my original post with more solutions. This time, I had a AC30TB preset that required the Amp Basic Treb to be set at 0.00 instead of 5.00. Another only required an increase of Drive by 1 or so.