DC --> AC Car adapters?

[Corsairpro]

I read a review for Logitech Z-560s in which someone hooked up their speakers in their car and said their speakers sounded comparable to people w/ $1000 systems. I'm not as vain as this person, but I'm home for the summer from college and I have my Cambridge Soundworks MegaWorks 510D 500W speakers sitting around doing nothing. So I figure, hey, I use a portable CD-Player to listen to CDs in my car anyway... why not try that.

I looked around and found that Power inverters or DC --> AC converters are what i need. I also saw that they have different wattage ratings. What kind of inverter/ DC --> AC adapter would have DC passthrough (to still power my CD player) as well as provide enough juice to power the sub and 2 speakers to give stero sound. Cheap would be good too!

http://www.3dsoundsurge.com/reviews/MegaWorks510D/MegaWorkss.html

Those are the speakers i have.

Thanks,
David

 

[jonn]

Well a friend of mine runs a circular saw 7 1/4 inch, a 1.2inch vsr drill from his truck which has only a 38 amp altinator on the (dont know wattage/amperage) cheapest invertor Walmart sells.

 

[Chrono310]

I've heard before that those DC->AC converters are pretty hard on the battery.

 

[Corsairpro]

even when the car is running?

does the alternator thingie provide all the electric then?