Summary: First off, let me say that I NEVER write reviews for anything I buy, but feel compelled to write one for this product to warn others. I've purchased Altec Lansing speakers before and have even recommended them to friends and never have I heard or had any problems. That is, until I bought these. DO NOT listen to the other reviewers who had nothing but great things to say about these speakers...they must be working for Altec Lansing or something.
Summary: In exactly 12.5 months (just out of warranty)the system began to fail. I use it with an IBM Thinkpad and I have an earlier Altec Lansing ACS 340 which continues to work fine. I called Altec's tech support 1-800-258-3288 and was told that even though the system was out of warranty they would fix it. All I had to do was wait for a call from their tech people to check it out. Call never came. Called back and was told to connect the system to an MP3 player. Did that.
Summary: I have a MSEE (Master's in Electrical Eng) - this sound system is flawed from the ground up - there is a substantial 60 Hz hum that will not go away no matter what volume level or wiring configuration you use. The company has the nerve to print in its op manual that such hum is "normal" - and therefore will not do anything to remedy it - I returned mine to Amazon within a week - I hope they have the decency not to charge me for shipping back such a defective unit.
Summary: I researched these speakers EXTENSIVELY before purchasing them. As is the case here, the vast majority of the user reviews on the various online merchant web sites are all extremely positive. The professional reviews, however, are more accurate. Read on if you want to know why this system is getting RMA-ed.