Thanks for all the positive feedback and suggestions.
I was initially afraid I was asking a dumb question but glad to see all the comments.
What started this in my mind was looking at video's on the Puritan PSM156 and all the rave reviews it seems to be getting.
I started to wonder if my Isotek is doing a good job already and if there is anyway I can verify how good a job it maybe doing besides just listening to the system.
And that's when I started looking for devices that could potentially provide me a before and after affect of my Isotek, I know it may not be that simple as there are many variables for each situation.