If you have a volt meter, try testing without the cap. If if put out more voltage, you might need to look into the cap itself. It could be bad, or it's just not charged.
I think it's 1100x1@4ohm, 1800x1@2ohm, 2300x1@1ohm. I don't know whether or not these amp is capable of putting out these numbers.
Odsound, what is the minimal ohm load this two amp is capable when bridged?