Hmmm this is more of a PA/Soundsystem forum than Hi-Fi/Car Audio, but maybe we can help; Sounds to me like you could get some use from a multi-input 12 volt "PA" amplifier like this one: http://www.cybermarket.co.uk/shop/public-address/vehicle-roof-mount-pa-systems/eagle-pa-vehicle-pa-amplifier-1183211.html?pid=1183211&gclid=Cj0KEQjw8tbHBRC6rLS024qYjtEBEiQA7wIDecco7MIxQ6dzPkeJjprWhyw10lwPpOQ2k_mIKwBcsa8aAt3M8P8HAQ" rel="nofollow - https://www.cybermarket.co.uk/shop/public-address/vehicle-roof-mount-pa-systems/eagle-pa-vehicle-pa-amplifier-1183211.html?pid=1183211&gclid=Cj0KEQjw8tbHBRC6rLS024qYjtEBEiQA7wIDecco7MIxQ6dzPkeJjprWhyw10lwPpOQ2k_mIKwBcsa8aAt3M8P8HAQ - although the naming is confusing because you'd sure as hell never use that on a real PA ;) They're for voice announcement horns at county fairs and whatnot. Such a unit would run from your vehicle battery and not require a 120v power inverter as I assume you're currently using, and they are very cheap. The quality is not very good though, and they lack tone controls. Another way to go would be to buy a very cheapo standard real PA amp like this one: http:// www.ebay.co.uk/p/?iid=262503084631&&&adgroupid=33676502101&rlsatarget=pla-270397403683&abcId=893836&adtype=pla&merchantid=114941614&poi=&googleloc=9046357&device=c&campaignid=707291931&crdt=0&chn=ps" rel="nofollow - https://www.ebay.co.uk/p/?iid=262503084631&&&adgroupid=33676502101&rlsatarget=pla-270397403683&abcId=893836&adtype=pla&merchantid=114941614&poi=&googleloc=9046357&device=c&campaignid=707291931&crdt=0&chn=ps and a small mixer like this one: http://www.amazon.co.uk/d/o62/Behringer-802-8-Input-2-Bus-Mixer/B000J5XS3C/ref=pd_lpo_267_bs_img_2?_encoding=UTF8&psc=1&refRID=CYSFDCNS6S4KW39354V8" rel="nofollow - https://www.amazon.co.uk/d/o62/Behringer-802-8-Input-2-Bus-Mixer/B000J5XS3C/ref=pd_lpo_267_bs_img_2?_encoding=UTF8&psc=1&refRID=CYSFDCNS6S4KW39354V8 and that would give you more power, better quality, and more adjustment range on the sound. I picked Pyle Pro because I think they are common in the US? Otherwise go for Behringer....cheap and cheerful ;)
You could also look at using a standard 12 volt car audio amplifier with the small mixer. There are some very good models available now that combine high power output with high efficiency and can be run from batteries (ie, engine off) for a long time. Look at units from Vibe and Alpine for a start. The technology you need is called "Class D", that means it's efficient.
Is there a reason you don't want to just buy another used 120v receiver? Sure you could pick one up for less than $500. If you want to have 3 different video feeds going on and only the audio from 1 at a time, a modern HMDI switching receiver is probably not what you need, as they would usually only play the audio from the currently selected HDMI input and correspondingly only route its video to the output. You would need a much more complex HDMI matrix switcher to enable free routing of audio and video from all inputs to all outputs. Those guys are $$$$$.
Also, you say your video sources are cable TV boxes - I am confused, how do you get a cable hookup out in the parking lot at the football stadium? Or do you just party in your back yard? I'm not entirely sure I understand what tailgating is....
------------- Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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