I thought the speakers in the doors were mid-range, not woofers. I replaced the whole sound system in my car. I went to the Bekker authorized shop in Laguna Niguel, California, because my year (93) was so complicated. MB placed a receiver and two amps (Bose) in the trunk which ran the whole system. But the system ran off of 2 ohms, instead of 4 ohms, which is the current standard.
To make a long story short, I gutted the whole system, replaced the speakers with Polk audio in the dash, doors, and rear deck (two-way speakers in the dash and rear deck, mid-range speakers in the door). I put in a Pioneer head unit because they claimed Pioneer had the best tuner and processor. The shop is a factory authorized dealer and repair place for Bekker, Sony, Alpine, and Pioneer, and they thought Pioneer made the best stuff. They owner and his installer even had Pioneer in their own cars.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".