Hi my name is*****'m a 30 year audio engineer. I think I can help.
Can you tell me how you tested the speakers?
How do you know they are good, or do they just look good?
I have a quick way to test if you're not sure.
This is not normal for the Jensen head unit. Although it does happen with mid fi systems occasionally. I would suspect that the amp section may not be seeing the correct impedance at the unit. You say you measured the speakers with an ohmeter correct?
Did you measure all the speakers separately at the unit? If so, can you tell me the reading you got?
You may have a speaker that has voice coil damage and is showing a low impedance to the radio's amp. If this is the case, it will cause the amp to shut down to protect itself
If this is the problem, you would need to replace that one speaker. If this is not the problem, then there are many units that will fit and replace the Jensen, and I can help with that.
Hello, do you still need help?