Audio Systems: Car Stereo problem, factory speakers, omega symbol


Question
QUESTION:  Hi, I installed  two new pairs of Pioneer speakers in the front and rear. Now the system shuts down at higher volumes. I used to be able really crank the volume with the factory speakers. Thanks for the advice. Ed.
ANSWER: my guess is that your old factory speakers were probably 8 ohm speakers and the new ones are probably 4 ohm speakers.  in fact, if you still have the old factory speakers you can probably look at the back of the magnet and it's probably stamped on there.  it will have a number and the little omega symbol.
so if that's it, the 4 ohm speakers draw more than the 8 ohm speakers which is why it's shutting off.
If your cd player is factory then you'll probably need to change it.  if its aftermarket then it should be able to handle 4 ohm speakers.  in which case, the old factory wiring is probably the problem.  you'll have to run beefier power wires for the cd player or get an amp.

let me know if I can be of any more help!

---------- FOLLOW-UP ----------

QUESTION: I checked the impedance of the old and the new ones, both are 4 ohms. Could it be polarity? If so, how do I determine positive or negative from factory wiring? Thanks,I thought you were on to it with the impedance!  

Answer
hmmm. I thought i was too!  I was quite sure of that in fact.  oh well, you win some, you loose some!
the polarity cant do it.  if the polarity is wrong it will just sound crappy but wont cause it to shut off.
is it possible that you are just turning the volume up higher than you use to?  not loudness wise to your ear, but if the cd player has numbers on it indicating the volume, are the numbers going higher than you remember?  aftermarket speakers are usually not as efficient as factory speakers because they use stiffer materials for the cone which make better sound, but weigh more, which takes more power to make'm move.

also you never answered me wether it was a factory cd or an after market cd.