Anybody feel like discussing Old Mopar/Motorola hybrid AM radios?
View attachment 1714979384 View attachment 1714979385 My speakers in question. Front speaker on top , rear speaker x2 on bottom.
While the spec 4-8 Ohms is impedance, which is not just DC resistance, it includes the dynamic resistance to the audio.
However, what is important to the transistor is the DC resistance regarding the operating point.
Measure the speaker resistance with the wires disconnected.
If they are closer to 8 ohms wire them parallel.
If they are closer to 4 ohms, wire them in series.
If they are 6 ohms, try both ways and use whichever way is truly louder.
Make sure they are "in phase".
If thats parallel, both plus together, both minus together.
If it's in series, its into the positive speaker terminal, out the negative to the other speaker's positive, then the negative out to the return wire.
If it's hard to tell whether the speakers are in phase, you can connect a 9 volt battery to the wires (disconnect radio) and note which way the cone travels when applying voltage..feel the cone from behind and it will be clear which way it goes. Make sure the two speakers both go the same way, even if the terminal designations would have you thinking it's wrong with plus on one, minus on the other to get it so the speakers are in phase.