TOKYO (Reuters) – Japanese car electronics maker Pioneer Corp said on Tuesday that it would sell its disc-jockey equipment business to private equity firm KKR & Co LP for about 59 billion yen($550 million). Pioneer has been selling off non-core assets to focus on its automotive electronics business. On Friday, the company said it would sell its home audio-visual business to audio equipment maker Onkyo Corp . Pioneer said that it expects a 55 billion yen special profit from the sale of the DJ equipment business and that it may revise its earnings forecast. …