A FIRMWARE UPDATE IS AVALABLE for Pioneer Elite VSX-21TXH and VSX-23TXH receivers.
Contrary to Pioneer's website, which indicates that there are no firmware updates available for these models, THERE ARE FIRMWARE UPDATES available, -- TO ONLY AUTHORIZED SERVICE CENTERS. This firmware update will resolve audio problems you may be experiencing, such as no dialog, or poor volume or poor fidelity when watching Blu-ray movies, especially those encoded with DTS-HD Master Audio or Dolby TrueHD. It also resolved issues with poor BASS or the BASS fading in and out.
After taking my VSX-23TXH receiver in for repair (a FREE repair, -- because mine was still under warranty), the Tech told me that my receiver had firmware version 2 installed on it. The Technician was able to download the latest version (version 5) from Pioneer and updated the receiver. I was surprised to see that this resolved all the problems I was experiencing, because I was under the same impression as most of you were that no firmware updates were available because when I went to Pioneer's website and queried if there are any firmware updates available for this particular receiver, it says there are none.
So if you own this model of receiver (or any other model, for that matter), and are having problems, chances are, a firmware update might resolve the issue for you. Because this firmware update resolved the HDMI / Digital Audio problems I was experiencing, I thought I would share this experience with others, as I am sure I am not the only one dealing with these same problems.
So just because Pioneer's website does not show any firmware updates available for your model, DOES NOT MEAN ANYTHING. There is a good chance that there is a firmware update that will resolve your problems. Just open up some communication with your local repair shop that is authorized to work on Pioneer products, and they will work with you.