Re: I have a loud humm in my bose lifestyle 28 system
Turn on your bose so you can hear it hum. Go to the back of your cable box and remove the co ax cable connected to "cable in". If the humming stops, the sheilding on your cable is no longer grounded. Purchase MPAV800 or similar surge protector to run cable line through it and get it grounded.
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If you want to connect your PC's audio output to the Bose Lifestyle system, simply get a cable with 3.5mm stereo male plug on one end, and dual RCA male plugs on the other end. The 3.5mm side will plug in to your PC's LINE OUT jack. The two RCA male connectors will plug in to the Bose AUX IN jacks. On the Bose console (or the remote control) select AUX as the audio source. Your PC's sound will play through the Bose Lifestyle system.
For persons having a large library of MP3 music files on their PC, this is a great way to listen to the music on your hard disk.
A humm may be caused by a cable TV grounding problem called a "ground loop." Basically, the grounding for the Cable TV line and the power outlet for the TV are at unequal levels. I had this same humm with both the internal TV speakers and with external speakers (headphones, etc.). The 2 solutions are (1) install a Ground Loop Isolator at the TV, or (2) call the cable company to troubleshoot the problem. I figured the time I saved dealing with the cable company was worth the $50 for the part. I installed the Jensen VRD-1FF which has worked perfectly! Ordered from eBay and saved about $12 over the Jensen Electronics web site price. Hope this helps.
I have also have this problem with a lifestyle 28 system. Bose sent me a new cable then a software update. The problem remained, after contacting Bose and unplugging cables and powering down the system this solved the problem. However 2 days after and the problem has re-appeared. Back to square one. I should add that this is the second unit I have had the retailer exchanged the last one because of the same problem.