Poor music source. If you are using an aux cable to connect your smartphone or mp3 player to your CD player sometimes it can cause the muffled kind of sound. Ensure that you are using a high end cable and that its pushed in all the way into both sides of the sockets. Also ensure that the sound settings on your plugged in device are balanced out such as the EQ and that the volume from the device is placed in the middle and not all the way up. This is the best way to get the cleanest signal to be feeded in your stereo with minimal clipping and distortion.
Check the crossover settings on the car amplifier. Sometimes the low pass filter and the high pass filter are incorrectly setup. The role of the LPF is to pass through bass through and filter the vocals out. You need to ensure that is turned off and instead the HPF is enabled. This will allow voice and treble to be sent to the speakers, since the low pass filter is used only for bass subwoofers. You want to setup the HPF around 100HZ or closer depending on your listening tastes in music. Also to mention nearly all aftermarket car stereos have this setting also integrated, so you want to match the up accordingly exactly the same values both on the amp and radio.
Identify any loose connections or shorts with the speaker wire. If the wires are becoming loose or are touching each other, this can cause the car speakers to sound fuzzy and muffled. So double check the speaker wires right from the back of the CD player to each individual speaker placed in the doors and rear shelf.
Bad RCA cables only applies if you have connected a amplifier to your car speakers. These are used to feed input signal from your headunit to the amp. So basically it feeds the music into it to allow it to be processed and transferred into a bigger louder signal. You can't really tell if they are bad from the outside because the soldering usually comes off inside the plugs. So get a spare set of RCA cables and run it from the front to the back for testing purposes. You don't need to go underneath the carpets yet because at this point you are still unsure whether or not the current cable is faulty.
A blown damaged speaker or amplifier. Unfortunately, if this is the case then you will need to replace all the car speakers in your car that sound muffled like they are underwater. Once the voice coil is damaged from too much rms power or an unclean signal from high levels of pure distortion it is irreversible.
Bad RCA cables only applies if you have connected a amplifier to your car speakers. These are used to feed input signal from your headunit to the amp. So basically it feeds the music into it to allow it to be processed and transferred into a bigger louder signal. You can't really tell if they are bad from the outside because the soldering usually comes off inside the plugs. So get a spare set of RCA cables and run it from the front to the back for testing purposes. You don't need to go underneath the carpets yet because at this point you are still unsure whether or not the current cable is faulty.
A blown damaged speaker or amplifier. Unfortunately, if this is the case then you will need to replace all the car speakers in your car that sound muffled like they are underwater. Once the voice coil is damaged from too much rms power or an unclean signal from high levels of pure distortion it is irreversible.
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