Just going with a better set of speakers, even the HD Boom series will improve the sound. Personally if I were going to keep the HK head unit and not go with an amp, I'd look into a good set of 6.5" speakers and adapters, or even the regular JM 7.25", make sure whatever speakers you buy are 2 ohm in order to match your HU.
2010 FLTRX With Plenty of extras, goes by the name "Hardeshia"
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Also not pictured 2016 FLTRXS and 2017 FLTRXS, you never can have too many SHARKS......