Compass_Rose.
Others here spoke of "polarity." But, what I can gather from what they spoke of? Was to check the "phase" to make sure both speakers are wired the same. You may find if you reverse both speaker's leads - red to the black, and black to the red- that will reverse polarity. If one pair of speakers was designed with reverse polarity one pair will produce less bass. Simply reverse the leads to BOTH speakers. Then listen. Correcting the polarity should produce more bass.
Others here spoke of "polarity." But, what I can gather from what they spoke of? Was to check the "phase" to make sure both speakers are wired the same. You may find if you reverse both speaker's leads - red to the black, and black to the red- that will reverse polarity. If one pair of speakers was designed with reverse polarity one pair will produce less bass. Simply reverse the leads to BOTH speakers. Then listen. Correcting the polarity should produce more bass.