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The era of mass-market audiophilia has led to some big changes in headphone technology, a long-established audio staple which some might have thought had reached the limits of innovation. Yet new developments keep coming, and sales stay relatively healthy while the electronics market generally has been hit by economic insecurity. Market-leading european audio products vendor Sennheiser provides an indication of market growth from its revenues: last June it posted a 20 per cent increase in turnover, of which its headphone business accounted for the largest part - 34.9 per cent, up from 33.8 per cent the previous year. Small growth, but growth all the same.