I have had a rather disoncerting lw level buzzing

Do you have any other nearby devices that emit radio frequencies like a wireless router or a cell phone? I have had issues with buzzing on some of my speakers when my cellphone was nearby.

LOL. This is a common, easily solveable problem. Remove your cellphone or anything that emits radiation of any sort from the general area. Don't believe me? send a text message while sitting net to your speakers. It does this even if you arent sending a message because your phone sends intermittent signals to the cell tower. the radiation being emitted from the phone does weird things with the magnets inside the speakers.

LOL. This is a common, easily solveable problem. Remove your cellphone or anything that emits radiation of any sort from the general area. Don't believe me? send a text message while sitting net to your speakers. It does this even if you arent sending a message because your phone sends intermittent signals to the cell tower. the radiation being emitted from the phone does weird things with the magnets inside the speakers.

main board or power supply, report to b and w service. known problem

the power board has a known defect, contact b and w service as this is a known problem if you have not already.

you have a faulty unit, they will fisx it if you have not already sent it back.

ur sub wont buzz due to bad speaker. either u have a faulty preamp or power amp. yes it can be repaired and will not cost much. if it is loud and annoying, get it repaired. sometimes subs emit low hum when powered up. this is the way the are desinged.

Return to your retailer with proof of purchase; B & W will rectify this known fault.

this could be the amp board or the power suplly board, the power board can cause buzzing before the red light flash failure, just contact b and w service or the place of purchase and they should arrange repair.

There may be some sort of electrical device like a mobile phone or something that is near the base unit of the speakerset... try clearing the space around them.. or else it might be cuz of a loose connection... check n reseat all the cables & hopfully the problem will sort out...