I don't know why it was discontinued, but Power Acoustik used to make a line of Farenheit head units that were capable of decoding Dolby and DTS audio. I don't have a clue if they were capable of up-mixing. But damn, I would have bought one and spread the word far and wide if I had known about these, even though Power Acoustik sucks. If they had kept making them maybe a bigger, better player would have tried it.