Originally Posted by Cab_Burge
I "think" the originals pre 1974 factory single speakers where 4 ohms, maybe 8 ohms. confused
As far as ohm rating the smaller, lower, the numbers the less resistance. I'm not sure about how that affects the wattage needed to drive them confused shruggy
I'm wondering if the stock AM and AM/FM/ and AM/FM tape player radios had different wattage output for multiple stock speakers work confused


Back in the pre-74 days, all of the OE head units had either a mono 4Wx1 output stage or a stereo 4Wx2 output stage, all into 8 Ohms..
As the aftermarket stereo biz grew then next higher powered head units having 10W per channel output having what was called a bridged output stage which was actually dual amplifier stages in a push-pull type circuit...
However the bridged output stage did not use a common chassis ground circuit, all speaker output leads (+ & -) were above ground..


Just my $0.02... wink