Bass stopped working on right side speakers months after installing new Pioneer four-ways in back


Canoeman

CarAudio.com Newbie
Sep 5, 2020
1
0
Asheville NC
Hi I am new to this forum and no next to nothing about car audio. I have a 1999 Toyota Camry with the factory CD player and radio. One of my rear speakers went out so I replaced both with Pioneer four-way speakers. I thought I had everything wired correctly and it sounded great for about six months. Then I noticed that the bass had dropped out of not only the new rear right speaker but also the original right door speaker. I have not yet tried switching the speakers, but I did switch the wires on the right rear and it did no good. Did I blow something in the stereo? Thanks
 

1aespinoza

Junior Member
May 22, 2013
848
229
Pharr, Texas
Did I blow something in the stereo? Thanks
If you can get a multimeter, test the resistance on that new 6.5. It should read what the spec sheet claims. More than likely 4ohms. Most oem radios play at 4ohms on the voice, so I do not believe you under loaded it. The fact that they are still getting power means that you still have a full spectrum signal.
 

Lasherž

CarAudio.com Elite
Apr 27, 2020
1,236
284
United States
If you can get a multimeter, test the resistance on that new 6.5. It should read what the spec sheet claims. More than likely 4ohms. Most oem radios play at 4ohms on the voice, so I do not believe you under loaded it. The fact that they are still getting power means that you still have a full spectrum signal.
4 ohms is the impedance under load, so the non-load resistance as read by a multimeter will be between 2/3 and 3/4 of the rated impedance. The actual reading is entirely dependent on the temperature. For 4 ohms it should read between 2.66 and 3 in other words.
 

Lasherž

CarAudio.com Elite
Apr 27, 2020
1,236
284
United States
Hi I am new to this forum and no next to nothing about car audio. I have a 1999 Toyota Camry with the factory CD player and radio. One of my rear speakers went out so I replaced both with Pioneer four-way speakers. I thought I had everything wired correctly and it sounded great for about six months. Then I noticed that the bass had dropped out of not only the new rear right speaker but also the original right door speaker. I have not yet tried switching the speakers, but I did switch the wires on the right rear and it did no good. Did I blow something in the stereo? Thanks
An easy and lazy way to test speakers is to touch a 9v battery between the terminals, AA and AAA work too (or a diode test mode on a multimeter). There should be cone movement (don't hold the battery on there, you're just looking for movement with some quick taps). If not use a multimeter to measure the resistance between the leads as 1aespinoza mentioned. A faulty speaker can either be OL, super high, or far lower than rated, like under half. If it reads good then you should check your wiring. Car speakers endure a lot of elements, so it's pretty common for the terminals to corrode to the point they don't play. If you used an adapter that should be reconnected too.
 

1aespinoza

Junior Member
May 22, 2013
848
229
Pharr, Texas
4 ohms is the impedance under load, so the non-load resistance as read by a multimeter will be between 2/3 and 3/4 of the rated impedance. The actual reading is entirely dependent on the temperature. For 4 ohms it should read between 2.66 and 3 in other words.
I always wondered why even new subs would not read their listed resistance. 4ohns would always be berween 3.3 and 3.8. 3ohns between 1.8 and 2.9. I attributed it to meter battery being low but when I touch leads to each other it is zero.
But on that note, I notice mids and highs are usually only .1 to .2 ohm off target. (Cue in School House Rock intro track) Now I know.
 
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