4K TVs do not necessarily have better audio quality than Full HD TVs. The audio quality of a TV is determined by the built-in speakers and audio processing capabilities, which can vary between different models regardless of resolution. To ensure high-quality audio, it is recommended to invest in external speakers or a soundbar, regardless of the TV resolution. **

Newer 4K TVs have fewer Hertz than Full HD TVs because the higher resolution of 4K requires more data to be processed and displayed, which can be more demanding on the TV's processing power. As a result, manufacturers may prioritize resolution over refresh rate, leading to lower Hertz in 4K TVs. Additionally, many 4K TVs are designed for high-quality, cinematic viewing, where a higher resolution is more important than a higher refresh rate. However, there are some 4K TVs with higher refresh rates available for those who prioritize smooth motion in their viewing experience. **

Streaming HD movies can be legal or illegal, depending on the source of the content. If you are streaming from a legitimate source such as a licensed streaming service like Netflix, Amazon Prime, or Hulu, then it is legal. However, if you are streaming from unauthorized sources that distribute copyrighted content without permission, then it is illegal. It is important to be aware of the source of the content and ensure that you are accessing it through legal means to avoid any legal issues. **

Series and movies are not displayed in full screen mode on smart TVs because they are typically filmed in a widescreen format, such as 16:9 or even wider. When displayed in full screen mode on a TV, this can result in the image being stretched or cropped, which can distort the original aspect ratio and quality of the content. To preserve the intended viewing experience, smart TVs typically display series and movies with black bars at the top and bottom of the screen, known as letterboxing, to maintain the correct aspect ratio and ensure that the content is displayed as intended by the filmmakers. **

Large TVs and large projector TVs do not necessarily have poor picture resolution. The picture resolution of a TV or projector is determined by its display technology, resolution, and processing capabilities. Many large TVs and projectors are designed with high-resolution displays and advanced image processing, resulting in excellent picture quality. However, it is important to consider the quality and specifications of the specific TV or projector when choosing a large screen to ensure optimal picture resolution. **

TV manufacturers, retailers, technicians, and consumers are the primary groups of people who know about TVs. Manufacturers design and produce TVs, retailers sell them to consumers, technicians repair and maintain them, and consumers use them in their daily lives. Additionally, industry experts, reviewers, and enthusiasts also have knowledge about TVs and can provide valuable insights and information. **

As an AI, I don't have the capability to watch movies and series on streaming sites. However, I can provide information and recommendations based on user preferences. If you have any specific questions or need assistance with finding content to watch, feel free to ask! **

Tube TVs generally consume more power than LCD TVs. This is because tube TVs use cathode ray tubes to produce images, which require a significant amount of energy to operate. On the other hand, LCD TVs use liquid crystal displays, which are more energy-efficient and consume less power. This means that LCD TVs are more environmentally friendly and can help reduce electricity costs compared to tube TVs. **