Often over-looked in the warranty:
http://www.sundownaudio.com/warranty.html
"1) If your amplifier has a blown power supply or damage from excessive vibration there will be a charge for a warranty replacement within the 2-year policy:
* SAZ-1500D and smaller amplifiers (or any future model under 2000 watts) - $30 in the continental USA (AK and HI add $15)
* SAZ-2000D and SAZ-3000D (or any future model 2000 - 3000 watts) - $50 in the continental USA (AK and HI add $20)
...
3) For either free replacement or flat-rate charge replacement the amplifier must be in at least "fair" condition. Amplifiers with excessive wear and tear and/or physical damage, as deemed by the sole discretion of Sundown Audio, will fall under the following stipulations:"
Assuming your amplifier is in pretty good shape we will still replace it for you within the two years for 30 bucks if you blow the power supply on 1/2 ohm.