What is the max volume level on the head unit? If it’s 40 than that’s about normal for distortion (3/4 volume) to start creeping in. The key is to set your system up so you’re at max power to speakers from amp with a distortion free signal from HU.
I’m not a JM fan so I’d say cut bait and start over with some good speakers and whatever amp you can afford. For 1/2 - 2/3 of what you pay for JM you can have an exponentially better system with other brands. In my book JM falls directly between boom stage 1 and stage 2 and that’s not a good place to be. What’s your budget?
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Freedom isn't free, remember to thank a vet.
2018 CVO RG lava orange, 117 Stage 3, 14" F47 and a few chrome extras. Boom crap gone.
2016 RG Special Cosmic Blue, 120ST with Dragos 2:1 and TTS tuner, FBI drop seat kit and JNR air ride. Stock audio long gone.