What with the current economic climate making us all feel a little gloomy, and the price of fuel rising, why not treat yourself to an "audio upgrade" and give your car a sound makeover? We have got some great offers at the moment from Hertz with a selection of amplifiers, speakers and subwoofers at amazingly low prices and a small quantity of JL Audio 500 watt RMS monoblock amplifiers at only £149 and 12" subwoofers for only £49.