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I have replaced all my speakers but the front Bose (the 8" ones). Can they be replaced just plug and play or is there something else needed?
Those are subwoofers with dedicated amps mounted right besides them.
It is my understanding that their impedance is just 1 or 2 ohms. That is not common, and if you replace them with 4 ohms units, right there you will be effectively limiting the power output of the subwoofer amps to just 1/4 to 1/2 of their current output with the OEM subwoofers.
On the other hand, there is the issue of physical limitations. These are reverse cone subwoofers mounted in a very tight assembly. Finding an 8-inch aftermarket subwoofer with an impedance of 1 or 2 ohms that also conforms to the physical limitations of the OEM mounting is going to be a challenge