By Christina Zander

Denmark's Bang & Olufsen A/S (BO.KO) posted a robust jump in fiscal fourth-quarter sales largely thanks to the successful launch of new products under the more affordable B&O Play brand, but at the same time reported a hefty loss.

The television and audio equipment maker, one of Europe's last, said Thursday that its net loss came in at 319 million Danish kronor ($47.5 million) in its most recent quarter, compared with a loss of DKK11 million in the same period a year earlier.

Revenue rose 14% to DKK695 million in the three months ended May 31, due to the popularity of its new affordable products on the market.

Bang & Olufsen, long confined to luxurious living rooms with its slick and pricey products, has sought to rejuvenate its customer base with a range of headphones and portable speakers.

The B&O Play products have been a hit with quarterly sales from the unit rising 52% to DKK193 million. But in competing for teenagers' ears, the company is now battling against powerful rivals including Bose Corp. and Apple Inc.'s Beats.

Bang & Olufsen posted an underlying operating loss of DKK53 million in the quarter, well below the company's own guidance forecasting an operating profit.

"It came as a surprise that they were unable to make any money," said Morten Imsgard, analyst at Sydbank. "The company is too small and its costs are too high."

Bang & Olufsen concurred. It blamed what it called "unsatisfactory results" on its lack of scale and a complex structure, but said a recent brand license agreement and the sale of its auto business would pay off.

The firm said it would work on further reducing its cost base, and expected to record a small operating profit in the fiscal year ended June 30, 2016.

Bang & Olufsen shares took a beating on Thursday, dropping as much as 14% on the Copenhagen exchange.

Write to Christina Zander at christina.zander@wsj.com

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