Alternate Power Source for Inspire 5.1 5200?

I have started Rv'ing full time. Still have my 5.1 speakers, which I love, and a new laptop, which I semi-love. I do not love the stereo system built into the RV at all. I did not keep the stereo components from the house or the desktop as being too bulky. Now, I want to put my home theatre together again. I want to verify what I thinking before buying any new stuff.
1) The laptop has only a single output jack. I'm thinking an external sound card will take care of that, right? I already have a separate USB digital decoder with an optical plug on the component end. I guess I could put all that together with the television, but I'm just as happy watching movies on the laptop anyway.
2) The speaker system has a power supply listed as being a 2v - to 20 v inverter. When not plugged into city power, I use an inverter to convert 2v to 10 to power the laptop and appliances. But in the case of these speakers, I'd be...using an inverter to convert 2v to 10 in order to power a speaker system that was 2v in the first place? That doesn't make any sense to me. I have an engine battery and 2 deep cell 2 volt marine batteries with an isolator to power everything when I'm off the grid. Isn't it possible to just power my speaker system directly from my battery system like any other automotive speakers? And if so, isn't there a straight connector I could use for that?
Sorry for length and depth. I am (obviously) confused at this point.

Hi galletgun,
Thanks for your prompt reply, I agreed with your advice,unfortunately the subwoofer can not buy separately,it comes with the set of satellite speakers (5.1)which is considerably becoming expensive in my case.
In the instance somebody out here get a chance to open up the same type of subwoofer pcb board then it will be a big help for me if they have a time to check out for the color codings of the resistors R01,R04 and R05. I may get the system back in sound by replacing those resistors.
I hope the "Creative Customer Assistance" themselves have a time to review and consider this forum as a "feedback" for the quality of their products and services. It is very disappointing for a customer to scrap a unit caused by a single or few burned passive electronic components which is in fact can be repaired. I do not think there is a confidential issue in revealing components specification to the customers.
I will appreciate a reply from the moderator of this forum.
Best regards,
Edward

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