BOSTON, MA--(Marketwire - Jun 22, 2011) - Charlesbank Capital Partners announced that it has closed its acquisition of DEI Holdings. Based in Vista, California, DEI is the largest designer and marketer of premium home-theater loudspeakers and consumer-branded vehicle security and remote-start systems in North America. The transaction was funded with both equity and debt. General Electric Capital and OPY Credit, an affiliate of Oppenheimer & Co., provided the debt financing.