Unless I'm overlooking something, ReaEQ has no option for oversampling, so when you EQ at the high end, the bells get warped:
With oversampling, the bell doesn't get squished:
2nd image is an EQ I have handy for illustration, but I've never programmed it, it only provides 2 band filters, and it's not free.
Squished bells are easier on your CPU but they don't sound as good. At some point I'll search for free EQ's that do oversampling, but this information here in the meantime.