Upgrading a Vintage Boombox?

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Hi, brand new here, and yesterday I picked up a small AIWA CA-W35 Boombox from goodwill for something to play with. Apparently it is only capable of 1.8w per channel, from 150-10k hz. I'm slightly insane and want it to be pumping out a bit more than that😉 where do i start?
 
keep the speakers, they probably are high efficiency so not much power is needed. put in a simple class D amplifier like the Tripaths since SQ isn't the priority and modify the supply for a smallish lead-cell 12v battery. hours and hours of fun!

a high-pass at 60~80 hz is a good idea to reduce wastefull power usage and increase usable output. can't expect any decent subwoofer-performance anyway.
 
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They are probably high efficiency indeed but I don't think they are designed to take 10 times the original power. I'd go with a PAM8403 with a 5v usb battery to get more power and longer lifetime. Don't expect to get much gain though, it's a fun boombox but it's outdated.
 
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