I have been using a pair of these amps bridged for two 4-0hm 15" subs. They have not failed me as I have tested them to their extremes. I have been extremely happy with their performance as they will power effectively down to about 25 to 30hz. Caution is that each amp uses a pair of fans that are loud. In fact they are very load. At higher volume at very low frequencies (Hulk) I have had two fuses blow between them but they powered on perfect afterwords. This is when I have pushed my audio to the limit.I know that Gem sound is a cheap company although I have had nothing but a great experience with these. I recommend them. Just as a note I am not sure if they live up to the RMS and max wattage they state but they are incredibly powerful.