Date registered: Oct 2007
Vehicle: 89 190E 2.6 x2
Location: Bay Area, CA
Mentioned: 1 Post(s)
Quoted: 91 Post(s)
So the stock head unit doesn't have much power at all It has a 2 channel output that goes to the fader and splits 4 ways. It's roughly 50 watts of total power, so about 12.5 watts per speaker.
Your low volume issues might have something to do w/ the speaker ohm rating. If I recall, the stock 4" speakers are rated at 6 ohms and most aftermarket speakers are 4 ohms. The lower the ohms, the higher the power draw, which the stock head unit can't keep up with, hence your low volume.
If originality isn't important to you, then I'd recommend swapping for an aftermarket radio. Most new radios put out 17-20 watts per channel which is plenty of power for the average listener.
#1.1989 190E 2.6 355 Diamond Blue Metallic, 1 owner car w/ lots of euro goodies.
#2.1989 190E 2.6 877 Blue Green metallic, Euro headlights, 15" AMG monoblock wheels, AMG replica body kit, rear lip spoiler
#3 1992 190E 2.6 888 Teal Blue Metallic, junker car parted out.