The most powerful and compact system i have ever played is the ILOUD 40 watt FRFR stereo monitor , yep that little bastard attached is 40 watts and has a 10 hour battery life, its a reference FRFR!! and as i say this word as much as BEER...IN STEREO!!
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I use it for a monitor with my stereo FRFR mission Gemini CAB on my kemper(s)
Its not cheap , Ceddy prob wont be able to afford it , but its compact and loud, i use Bias and amplitube with IRIG HD
Small and with 40 watts of balls even with a battery life of 10 hours
Its blue tooth so i blast the shit out of it in the car too
Ash