Summary: I purchased a used-like new model from Amazon. Everything was great at first I used mostly my HTPC into the soundbar and then soundbar to the TV via HDMI. However, the day I decided to add my XBOX to the soundbar via HDMI, I started to experience the popping sound.
Summary: This unit produces good sound, but is actually a piece of junk. It pops and bangs randomly and very loudly. The on-screen display contains only the volume bar, not the other 2 features it is supposed to include.
Excerpt: Hooked this up this afternoon with a HDMI cable that I had. Sounds great until it starts popping every 10 minutes. Looked online and found some comments about using the analog cables included, so I did that, moved the subwoofer to a different outlet and now it only pops every 20 minutes.
Excerpt: I bought it as a christmas present for my son. He hooked it up, sounded great, but had an intermittent "pop". The sync of video and audio was not reliable. He returned it. Hooked up the replacement unit, same problem. Sent it back for a refund. We are both very disappointed.
Update/Official reply from Harman JBL on open security in Bluetooth.
Sungjun Lee, Amazon
11 March 2014
Summary: Update: My woofer of SB400 was exchanged new one 6 months later. Mainborad of soundbar was broken around the end of 1 year warranty and need to be sent to a service center but delayed due to hard to find big box for the sondbar. The center refused to agree the warranty.