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Aftermarket auto dash / front door parallel speaker impedance questions

monkboughtlunch

monkboughtlunch

Super Member
Need forum expertise on this issue:

1. Aftermarket car receiver is by Pioneer. Pioneer manual states "When speaker output is used by 4 channels, use speakers over 50 W (maximum input power) and between 4 Ω to 8 Ω (impedance value). Do not use 1 Ω to 3 Ω speakers for this unit."

2. I've installed 4 ohm aftermarket speakers in the front door, rear door and dash locations.

3. I suspect the auto manufacturer wired the front door and dash speakers in parallel. If so, does this half the impedance the amp "sees," effectively dropping the 4 ohm impedance to a 2 ohm value for the front channels?

4. If so, since 2 ohm is not optimal for the Pioneer receiver, is there a way this can be fixed? For example, is it possible to increase the impedance "seen" by the car receiver by adding a series resistor to each of the dash speakers so that the receiver "sees" 4 ohms instead of 2 ohms for the front channels? Or other solution?

5. If so, what type of resistor and values would I need?

Thank you!
 
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Why not measure the DC resistance and see what it is? Yes, it's not the AC impedance the amp will see but you might get some idea of whether 2 ohms or 4 ohms or something else is plausible.
 
whoaru99 said:
Why not measure the DC resistance and see what it is? Yes, it's not the AC impedance the amp will see but you might get some idea of whether 2 ohms or 4 ohms or something else is plausible.
Click to expand...

The original OEM dash speakers I removed had a DC resistance of 12 ohms (that was designed for the original old OEM receiver).

Are you asking me to check the resistance of the new speakers in circuit or pulled out of circuit?
 
I found this diagram showing how the auto manufacturer wired the vehicle audio. Does this show the front door and dash speakers are wired in parallel?

diagram.png
 
do you know which model receiver was fitted ? its just any factory ones i have seen are all 4 ohms . i am curious if that one is . plus it would help if it was 4 ohms because you would know its all good to go .
 
the skipper said:
actually, swokie's diagram shows the "door" and "up" speakers are wired in series. so what are we dealing with here?
Click to expand...

I edited the diagram posted by the op, an easy way to series the speakers. :D

petehall347 said:
do you know which model receiver was fitted ? its just any factory ones i have seen are all 4 ohms . i am curious if that one is . plus it would help if it was 4 ohms because you would know its all good to go .
Click to expand...

Still a two ohm load on the front channels.. as wired..
 
petehall347 said:
do you know which model receiver was fitted ? its just any factory ones i have seen are all 4 ohms . i am curious if that one is . plus it would help if it was 4 ohms because you would know its all good to go .
Click to expand...

I think the OEM receiver was probably 56038622AJ. That’s long gone.

The Pioneer receiver now fitted is DEH-X7800BHS.
 
Wiring harness......aargh, what a pain. :oops:

Do the front door speakers have 4 wires connected to them? Because if they do, then 2 of those wires run up to the dash speakers. On the door connections, you would have to figure out which wire to remove (if those color codes are correct) and which wire to re-connect to make a series connection.

The same would be for if the dash speakers have 4 wires and the door speakers have only 2.

I could probably help you do it in person, but over the web is just plain suckie! :rolleyes: :biggrin:

Where do you reside so if maybe someone else close by can stop on by and give you a hand?
 
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