Design around the mini earthquake and lp210pa

I would like to design a portable boombox around theMini earthquake subwoofer and the lp210pa plate amplifier. I would like some feedback on the different ways to go about it.
1) feed the the plate amp a stereo signal and add 2 fullrange speakers to the output. I'm thinking some efficient smallish 4ohm speakers should be preferred as they should be better at high range frequencies and the mini earthquake takes care of the low range. Am I correct? No crossover needed as the amp has a lpf and a hpf that is fixed at 100 Hz 6 dB/octave
2) feed the plate amp stereo signal and use midrange woofer and tweeter to left and right output. So here I should go for 8ohm speakers and tweeters I guess and use a passive crossover between mid and tweeter. I'm guessing this would make the whole system less efficient so maybe not the best solution for a battery powered system.
3) feed the plate amp mono signal add midrange to left output and a tweeter to right output. I got this idea from the dinas speakers. I guess this would play louder I wouldn't get a high-fi stereo sound but I doubt stereo really matters when listening outside with around a campfire or such. Would need a crossover to the tweeter again.
4) other suggestions are more then welcome.

This would be my first project so I'd like to keep somewhat cheap and use the KISS method (Keep It Simple Stupid!). The sound doesn't have to be extraordinary but a nice sound should be good enough for the girls I go out with. I know my way around a soldering iron and basic electronic stuff but audio is kinda new to me.
 
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