I use an Onkyo DV-SP1000 for listening to DVD-R Audio, CD's, SACD, DVD-A and it plays beautifully.
However, a portion of my shows on DVD-R Audio will only play from one channel with the SP1000. It's odd. The same discs that would play from both channels with the Denon 2200. All discs were authored the same way - with DiscWelder Steel.