Hey I am just getting my first set up and had some questions, mainly, I was wondering whether I should get an amp to help power my speakers. Right now I have an old Kenwood KR-5150 ( i got it for free from a family friend, and puts out 50 W per channel) and recently purchased some used cerwin vega E-715's ( can handle up to 400 W, but I have heard that they are efficient). So should I get an amp? If so any ideas....

Thanks.