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Remember that since you didn’t buy that gear from that shop, even if they retune it and hook it up, if it messes up, then they aren’t held accountable and won’t pay out anything or give you new gear. So it’s best to just buy a fuse there and buy a dd1 and wait for it and hook up your setup then. There is no such thing as cutting corners or being cheap when it comes to achieving a good or decent car audio setup.

You should of took the fuse out before connecting the amp. You probably touched some metal on the amp near that terminal when you were plugging that wire in to be secured while that wire was live and messed that amp up. A gain has nothing to do with rms output. It is how you tune your amp to match the rca signal of your head unit or line out converter if you are using a factory head unit. Buy a dd1 to tune your new amp you are gonna have to buy and then remember when you plug or unplug your amp, make sure the fuse is out so the wire isn’t live. Now if you want to be cheap and not tune your amp correctly then no matter the rms you are putting to any type of subwoofer, if the signal is distorted then your subwoofer would stop working and you would have to buy another subwoofer. So honestly, a distortion detector pays for itself and then saves you money on your future car audio builds. https://www.wccaraudio.com/smd-distortion-detector-dd-36.html