On my continnium (slightly different thatn your 705) I have never had a problem and it's been in service for over 8 years. I did have a slight over heating problem with a 405 I had but only one channel would go into thermal roll back so much it actually shut off. I gave it a few minutes to cool and it came right back on. That channel was the center one on the amp which is the central heat source for some strange reason. Get your self some blower fans from radio shack and use those to bring cool air in or move the amp. I have some beta test's papers from when my pal who works at soundstream now did on the reference 300 if you want to see how hot it needs to be before it finally shuts off.