ok so i was hookin up my frends sub. everythin is hooked up right, least im pretty sure it is. when i turned on the amp the sub was barely movin. even turnin up the gain it still wasnt movin that much. wat could it be?? the amp turns on and everythin. idk wat i did wrong ha. at first i thought it was the terminals on the box but i hooked it up straight to the sub and the same problem happened. please help