Don't know about the Sundowns but I can vouch for the C2 Treatcon 2's. They are awesome!!!!! I have 2 12's running 1200 watts and they hit hard!!! My radar detector will not stay attached to my windshield, my mirrors are useless when I turn it up, and my windshield wipers dance like crazy. This is the first system I have installed and I am very proud of my C2's. I have had cars with systems in the past but nothing I have ever owned even comes close to these. From what I have read though the Sundowns are very nice, I went with the C2's because my cousin had them in his car and he got out of car audio, so I got a ridiculous deal on his amps and subs.