https://archivedforum.beoworld.org:443/forums/13.aspxThe main Meeting Place for BeoWorld members, and the place for General Questions, Answers and things to say! If you have any questions about anything Bang &amp; Olufsen related - please ask. If you have anything to say - please tell!enCommunityServer 2008 SP2 (Build: 31104.93)https://archivedforum.beoworld.org:443/forums/thread/131309.aspxWed, 23 Jul 2008 02:21:49 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:131309tournedos0https://archivedforum.beoworld.org:443/forums/thread/131309.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=13&PostID=131309<p>I think it must be the mains transformer that is humming. Apparently the windings loosen a little with age and start to vibrate along with the mains frequency. Newer equipment usually uses toroidal transformers, which are more quiet in addition to other benefits. I&#39;m afraid there&#39;s not much you can do about the transformer itself, but you might try adding softer feet under the receiver - I believe this was a factory solution for humming Beocenter 9500s <img src="http://forum.beoworld.org/emoticons/58.gif" alt="Laughing" /> - or placing it on a different platform. Many tables and shelves resonate at the 50/60 Hz, amplifying the hum.</p><p>I have an MX2000 tv, which as an old design has a large mains transformer. Now that I have it in a quiet environment, I have to switch it off completely for the night because of the hum...</p><p>Oh yes, and welcome to Beoworld! I tried to reply to you already yesterday, but apparently forgot to click &quot;post&quot;... <br /></p><div style="clear:both;"></div>https://archivedforum.beoworld.org:443/forums/thread/131135.aspxMon, 21 Jul 2008 22:32:17 GMT41a2a90c-3a1e-4bd3-b144-3883695a7f38:131135rosewood40000https://archivedforum.beoworld.org:443/forums/thread/131135.aspxhttps://archivedforum.beoworld.org:443/forums/commentrss.aspx?SectionID=13&PostID=131135What a great sounding unit with plenty of power, but this is the first B&amp;O I&#39;ve owned with a magical power supply (?) hum that increases in volume as the unit heats up. &nbsp;The hum does not transfer out the speakers (thankfully) but is a bit annoying. &nbsp;Anyone out there successfully found a way to eliminate it or subdue it a bit (short of putting the unit in a soundproof box)? Thanks in advance for any advice on this...B<div style="clear:both;"></div>