The other day I was messing around with my dvd player (Magnavox MWD200GA) and found a way to run my Roadmaster speakers to my dvd player (speakers are 6.5" Roadmasters in a box, can't remember model #). The sound is coming through to the speakers fine, but I don't have any way to adjust the volume. My dvd player doesn't have a volume button, and turning up the volume on the tv doesn't help because the speakers are run directly from the dvd player. My tv is a mono with no a/v output jacks. I was wondering if anyone knows if there is any way I can adjust the volume on these things?

There is no way if you don't have a volume control on your DVD player.
You could run the DVD output to the input of a stereo or amp and run it that way