Head Unit not playing full volume

[TroubleGSS 10+ year member]

I bought a JVC KD R620 and bout the proper harness for it with the chime. but with everything hooked up the cd is only playing at maybe 25% even with it turned all the ay up. is there something i should know about? the cd player is new so it shouldn't be that and everything else on it works too. the stock cd player still works at full volume if i hook it up. it is in a 2004 malibu classic. and i have my comps and amp coming soon and need to get this working.

thx in advance.

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