with the cd player only putting out 7 watts per channel, you're kinda screwed with getting any quality sound. 100 watt 6x9s would be a perfect application if you had a cd player that put out around 50 watts. most speakers have a minimal amount of wattage needed to push them...pretty much, the more watts you're feeding a speaker, the less you have to turn the volume up to get it louder. if you're wanting to keep that 7 watt koss, you've got two options: get some 10-20, maybe 25 watt speakers and wire those up; or if you have preamp outputs on the back of the cd player(red and white RCA posts), you can run an external amplifier...just find a 2-channel amp that'll push two 80-100watt 6x9s and you're set..and, as you know, with an amp you need a 12 volt power source and a ground..it just depends on how much work you're wanting to spend...