Bless those boffins at Blaupunkt with their Teutonic ingenuity!
The stereo in the turbocharged roller skate I use to terrorise the road users of Southern England has a feature called GALA, no doubt an acronym for whatever the German is to say "Make it louder when the car speeds up". The way I have it set with the likes of James Naughtie and Eddie Mair reading me the notable events of the day it allows me to hear the latest from the Corridors of Power very nicely as I zip along the dual carriageway between the traffic jams. They're fairly quiet.
Today was different though. My trip into work was later than normal so to avoid the tediom of mid-morning radio I stuck a CD in. The Tea Party's Tangents. I like this CD so I cranked it up as I meandered through the endless twenty zone and the cloud of buses that swarm round my city like flies to a dungheap. Big mistake. Because when I hit the dual carriageway instead of the normal stop-start rush hour I had an empty road and I nailed it. Ouch. GALA kicked in and my poor little car stereo responded with square waves so jagged they'd break an oscilloscope screen. Amazingly this HF distortion seems to have done no harm to my tweeters. Whether my ears have had the same good fortune remains to be seen.