Upgrading dvd to blu-ray - how can I use my existing surround sound speakers?

Unfortunately because your existing system does not have the option of connecting an external source, such as another DVD player, the only option you have is to reuse your existing speakers and purchase another amplifier. Trying to patch another DVD into your existing unit would require a bit of technical expertise which would be more trouble than it is worth. The all-in one concept is convenient but very limiting in terms of expansion.