You'd need an true amp to fully get the most possible out of a speaker upgrade. Plus, the amp matches the output of the speakers so you cannot blow them.My 2 cents, you don't have to drop a ton of money on stuff to gain an appreciable improvement. However, those factory B&O speakers need to be headed straight to the trash bin.
Just replacing the three 4" front speakers, the two 4" rear pod speakers, and the two 6.5" kick panel speakers made a huge difference for me. The rear pods on the B&O go down to between 150-200 Hz, but definitely cut below 150 Hz in my testing.
After replacing the speakers, it still isn't "high end", but it's competent for a base factory system and roughly comparable to an 8 speaker 2021 Honda CR-V EX-L sound system. Which is a decent factory stereo (not amazing, but decent).
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