These are the legendary Bose 301, they have been around forever. No matter what you need most of the time 301 delivers. Full range sound with superb bass response from the 8 inch woofer. Currently we are on series 5. Serie I, II and III were essentially the same with minor changes. Series IV are best forgotten as they had multiple issues with the tweeters and crossover components. The current model series V addresses series IV issues. All are rated 100-150w per channel and sound great.