Yes, infinity makes good car amplifiers.
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If you are talking about the car make - then the parent company of Infinity is Nissan Automotives.
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Yes, the Infinity is a very good car, although it is very expensive to repair.
Infinity Kappa is a car speaker that comes in a range of models which are to work out if it will fit ones car. An example on Amazon is an Infinity Kappa 6929i 2Way for just under $97.
Nissans luxuary side so Nissan make Infinity Kind regards