I once spent a summer's day walking on my own in some quiet woods and towards the end of it, I tried to spend some time in absolute silence - stilling even my thoughts.
After slowly calming my busy head for a while, I think I may have managed total silence for about ten seconds - though of course I wasn't counting.
It was surprisingly powerful. I remember, afterwards, feeling more alive than I had for ages, as though my senses were all highly tuned - and that after just a few seconds. Some friends laugh at me or say I'm 'going Buddhist', but it was quite something, and I'll never forget it.
I know that Christian or biblical meditation is about fixing your mind on good things (rather than emptying it) but I think there's a place for a 'noise purge' every now and then.