I’m trying to sum my car stereo output. Factory output has bass on one output and mid and tweeter on another output giving me 2 channels for left and 2 channels for right.

Ideally I’d like to sum them together and would of used something like a PAC LP7-4 however there doesn’t seem to have any availability in the U.K.

Is it possible to sum them by using 10k resistors and not cause any problems to the factory system?


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