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I just order...

Sub: Infinity Kappa Perfect 12.1
Comp: Infinity Kappa 60.7 cs 6.5 component system
Amp for comp: Diamond Audio D3 d3400.4

I already have these

Amp for new sub: JBL 600.1
back speakers are going to be my Kappa 652.5i 6-¾" 2-way Speakers
HU: Panasonic CQ-C9800
Wish i wouldnt have gotten that HU because it doesnt have XM radio, oh well.

How you guys think that will sound in a honda civic.

That sounds like it will be a nice sq setup but those infinity subs dont get very loud, so if your looking for some spl look at some other brands...RE, JL, Adire, or talk to Justin about some Elevation Audio

that hu is a good one its last years model thats y it dosnt have xm ready this years does though.