Hello! — Here’s an absolute beginner – just for information. — So I have a 2 golf with relatively original equipment. As a noise generation I use an ancient blue point CD radio with a cheap 4 channel blue point amplifier on a alpine something 2 way front system and very shimmery cheap things in the side parts next to the hat rack. Now I was thinking if I could not add something for the low frequencies additionally. — Now just for technical reasons. I have a question: — If I want to generate the bass with a single bass speaker for all 4 channels then somehow I have to bundle the signal from all 4 channels to a single channel or how to say it. Actually, I only need to take the signal from 2 channels because I only have stereo twice (once in front and once in the back). — So – how do I get the low frequencies on a single speaker from two independent signals? — An acquaintance said that I should just take mass from the left and plus from the right channel… But mass is the same everywhere that I would have only the right channel because mass is the right and left. — Could anyone follow me up here? I need 2 crossovers to get the low frequency out of the signal at all times. I would then connect the crossovers in parallel to the previous system simply on the radio. So. Then I have quasi bass for lin ks and bass for the right. Now I would have to get the two signals somehow into an amplifier so that somehow a single speaker signal comes out. Can maybe someone explain that to me? All I have asked so far were not really sure and they could not explain it properly because they either lacked the technical basics or the brain. Thanks cu