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What is the difference between HDMI 1.3 and HDMI 1.3a, or 1.3b?
For consumers, there is no difference between HDMI version 1.3 and 1.3a or 1.3b. These minor revisions to the specification typically relate to manufacturing or testing issues and do not impact features or functionality in a specific product. In addition, HDMI Licensing, LLC is actively working with manufacturers to reduce confusion for consumers by de-emphasizing version numbers and focusing instead on product features and functionality.

How can I identify which HDMI products support a specific feature, such as DVD Audio or Deep Color?
The key for consumers to remember is that HDMI has consistently enabled a variety of the most innovative new technologies (whether they are DVD Audio, SACD, 1080p/60, etc.). However, in many cases, it is up to each manufacturer to choose which features to implement in any given product. The manufacturer can choose the mix of features that makes sense for its customers and products. So, customers must choose devices that have the features that they want (instead of focusing on which version of HDMI is implemented by the device.). Consumers interested in confirming whether a particular consumer electronics product supports DVD-Audio or any other feature over HDMI are urged to review users’ manuals and product reviews, or check with manufacturers directly.

What Is Firmware Upgradeable?
Many of today’s electronics product are design for today’s standards.  Yet like personal computers, they have advanced capabilities that will let them be upgraded for use with new technologies and standards.  The ability to upgrade the firmware of an electronics product allows you to extend the useful lifespan of the device you purchase, and be able to expect support for many (if not all) of the emerging new standards.

What is the difference between Active HDMI and Passive HDMI?
There is no active or passive HDMI in the HDMI specification. These terms apply to cables. Active cables have built-in electronics to enable long cable runs, and typically these cables require a power supply. These cables use active electronics to help push the signal farther than typical passive cables.