upgrades are fun if you have the cash! If he's only got a $100 he should hook it up at 4ohms and save up some money cause $100 don't go far.As for used equipment it's a roll of the dice, usually no warrenty and the equipment may have been abused. Do you're research, save your money and make the right purchase the first time. It will save you a lot of headaches.

definitely!! but ill roll the dice.. i usually have good luck.. well not sure how long it will last tho.. keep my fingers crossed!
thx!

I would not start anything if I only had a $100, I would buy essentials like bread and milk.

well i can spend a bit more.. i think im gonna try looking for a used alpine mrp-f450, f550, f600.. what do you think? i will prob have to spend about $200

If my financial situation was so bad, that I was wondering whether to spend $100 or $200 on something trivial, I would not waste my time on garbage gear, and put my money towards making more money, and then consider getting something better, which may actually bring me joy. Right now, you are looking at spending so little money, that you may feel that you actually wasted your money after you buy it, run it, and decide that this is crap. We are trying to help do the right thing, if not, then dont waste your time and efforts. And going from something that is worth $100 to something that is worth $200 is hardly an upgrade, as you gotta count on variables like actually getting ripped off by someone. Man, think about what you want to have at the end, and work towards it, I would not suggest getting gear piece by piece without a plan. Just make sure you will be content with your decisions, as the bitterness of poor quality remains long after the sweetness of low price has faded.

i hear ya.. im not that picky with audio.. originally i was just gonna replace headunit and use headunit power to run speakers so i can any amp would make a difference.. i also havent heard the best audio yet.. so i have nothing to compare too.. lol.. but appreciate the advice.