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Can someone clarify please? I have the base CRZ without a sub, and I would like to add a sub, but the folks at Crutchfield were unsure how to assist with a hybrid, afraid of over-stressing the battery. Can I and a sub by tying into a rear back speaker and running sub power from the battery with no negative effect?

If so, should it be a passive sub or a powered sub? Appreciate the assistance, I just want to be sure I'm not causing harm to the system.
IMO, any additions to the audio system will have little or nothing to do with IMA battery (if this is what crutchfield was referring to). So other than the challenge presented by the ridiculously small 12V battery, you shouldn't worry about adding a powered sub within reason.
 

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^^ There have been a lot of instances of people draining the 12v battery very quickly. By most accounts, when this happens, letting car sit for a while seems to shunt power from the IMA battery pack to recharge the 12V battery (about 15 minutes). Understanding this, if I was planning to put additional load on the 12v system, I might consider fitting a higher capacity battery - just see how large the battery tray is before you start shopping. I'd imagine that this 'need' would depend on how much power the new sub is drawing and whether you tend to play it while parked.
 
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