The high range on my speakers are harsh...

The Rotel is a 60W amp (from what I found on the web), which means with lower sensitivity monitors, like the small Paradigms, it's pretty easy to push enough power through the Rotel to cause it to clip.

Do you notice the crackle all the time, or only when you turn it up a little and during the program peaks?

Paradigms are noted for harsh high end, IMHO they are voiced to stand out in a showroom playing rock.
THE Canadian speaker is PSB, never heard one that sounded harsh.

The V.6 Mini's are not harsh like some of there earlier speakers, Good all around speakers and hard to beat at the price. You may have a faulty one, is the problem from both? They really prefer a decent amp in the 100 watt range or more.

I would like to thank you all for the responses.

To clear up some questions:
- The high end problems were coming from both speakers.
- The crackling was sporadic, not consistent.
- I have not undergone any kind of room treatment.

Hifitime - Thank you for such a detailed post. Your research points were very informative and helpful. I brought my amp to my friend's place and attached it to his two Kenwood KLH AV 55 tower speakers. Sounded fine. Couldn't make it crackle. Then I reconnected everything and tried to make the tinny/crackly sound happen on my set up and found that that was difficult to do as well. I tried pandora, iTunes, and streaming from Hulu and Youtube, but sound was fine. However, on further analysis, I found that on certain site where I stream television programs or movies, etc. the audio quality is poorly uploaded as with the video quality at times. And some of my music that is much older has a lower quality as well. I think I have concluded that this is not a hardware issue, but a data issue. What do you all think?