The friendly support folks at Focusrite are the real deal.
I had emailed them to ask how I may have damaged the amp on my desktop monitoring system and included the pdf manual of the Radio Shack PA amp that I was using.
Their advice was, instead of 1/4” outputs of the Scarlett 2i2 going into the RCA jacks on the preamp, that I should be using the 1/4” balanced inputs for the preamp input. To control the volume, they said that I could use either the main volume on the Focusrite unit or the CD/Aux control.
It finally dawned on me that I had overdriven the preamp on the PA amp with the audio interface, which was what caused the problem. Hopefully, if I set the Focusrite to a moderate level and then control the volume with the PA controls, I should be able to use it without issues.
Thanks to all who responded to my earlier post
Glad that you have it resolved Keith!