Jl 450/4 power output not balance

[turn it up 10+ year member]

Hey, I just bought a JL 450/4 and everything seems great. But when I went to set my gain with the dmm I notice my left channel output on both front/rear was slightly weaker than right. For instance left would be .9~1.0v and right is 1.2~1.3v. What do you guys think could be the problem?

I check with my JL 500/1 and both the channel gave out equal output. Could it be bad rca? But how come both left front/rear? Maybe deck preamp is bad? Anyone have an 450/4 can do a quick test on theirs would be great. Thanks

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