hi all. just finished installing new klipsch quintet (older iv version) as my 4 satellites. when noticed sub was humming. (jbl es250p bought in '13 for $200.) i had plugged it in & out numerous times last couple weeks while installing new wire and speakers, playing ect. thought i caused a short in the audio input because it seemed to come and go when moving audio cable. however i could never duplicate the hum on purpose so i think it was coincidence it stopped while messn with the cable. hums all the time, even in different socket\/circuit. w different\/no audio cable attached. less loud when lte? turned off. looked around on here & av forums most say bad amp. took it apart (i have no idea what im doing, looking for obvious) didnt see any swollen leaking capacitors, burn marks lose soldering. sorry for long post. plate amp if i can find one that fits seems to be 150-200$. so unfortunately probably going to have to replace whole sub soon. questions: 1.worth it to take in to repair shop for estimate? 2. am i overlooking something that i could repair or not understand? 3. whats your thoughts on 2 cheaper 8" vs one higher quality (-$500) 12" sub? ....average size room. open to kitchen dining ect. vaulted ceilings. hardwood floors, sliding glass window. used 99.9% for tv, movies. rarely cranked up...dont have them yet but polk towers will be replaced with klipsch m60 bookshelves.