You can't.
No
No. All current 3D disc content is HD and so use Bluray discs. You have to have a 3D Bluray player.
A region 1 DVD is intended to be used in North America. Any BluRay player purchased in North America should play the disc. Bluray players from other regions such as Europe will be expecting to play discs marked with a different region code so are unlikely to pay a region 1 DVD.
No. DVD quality will be displayed whether the player is a DVD player or a Bluray player. DVDs won't be the same quality as a Bluray disc of course.
A DVD player cannot play a BluRay disc. A BluRay player can play both BluRay discs and DVDs.
A Bluray disc stores five times more data than a DVD. Therefore, a DVD will not have the capacity to store the contents of a Bluray disc.
The Panasonic SC-BT series (there is no SP-series) are theatre-in-a-box systems with a disc player with built-in amplifier. You don't need a receiver for this. Your Samsung would also have its own amplifier if it has speaker outputs. These two systems wouldn't connect to each other, but you may be able to use the Panasonic's speakers with the Samsung.
Bluray
Yes they are. They all play DVDs and Blu-Ray discs.Yes they do. They need to be connected to the HDTV with 1080P and a HDMI cable for the Bluray to work as a Blue ray disc player
yes, but you wont get high definition quality
You will require a Bluray player to play a disc. To watch content in high definition, you will need an HD television with an HDMI connection between them. However, Bluray players have analog outputs to allow a standard definition signal to be connected to non HD televisions.
PAL and region coding are two different things. PAL is a standard for encoding color signals and is the standard for Europe and other parts of the world. NTSC is a similar encoding standard and is used in North America as well as other regions. The two are not compatible so there is no guarantee that US content can be played on European equipment and vice versa. Region codes are used in DVDs, Bluray discs and most game discs. The code identifies the origin of the disc and players will check the code to ensure that the player and the disc are from the same region. This is purely a commercial restriction to prevent discs from one region (North America for example) being distributed and used in other regions (like Europe). A region free disc indicates that there is no region coed embedded into the disc and a region free player indicates that the player will ignore the region code on a disc and play the disc regardless of its origin. There are virtually no region free players available and although some players can be modified, this is likely to invalidate the warranty and in some cases, trying to modify it will simply stop the player operating at all.