# Kia K4 (Exclusive, 6-speaker audio) - Significant left/right imbalance, ear pressure sensation, tweeter hiss, and measurements showing 8-10 dB difference

Hi everyone,

About a month ago I bought a new Kia K4 Exclusive (Im from Czechia, Exclusive is the middle of the path kit) with the standard 6-speaker audio system. Overall, I'm incredibly happy with the car, but I've been struggling with the audio system since the first week of ownership and I'm trying to find out whether anyone else has experienced something similar.

# Main issue: left and right sides do not sound the same

The entire left side of the system sounds noticeably different from the right side. The left channel is quieter, lacks high frequencies, and the overall sound feels unbalanced.

I already visited my dealer about this. They have let me in a different K4, but the it did not sound as bad as mine, maybe a small difference, but not that noticable at all. Because of that, I'm no longer sure whether this is an individual defect or something related to the factory tuning/design of the base audio system.

# I measured it

To verify that it wasn't just my subjective impression, I performed several measurements using pink noise played from a USB drive.

I measured both channels under identical conditions and repeated the measurements multiple times. To isolate each side, I switched the balance fully to the side being measured and positioned the microphone at the corresponding seating position, approximately where the driver's or front passenger's head would normally be. The procedure was repeated for both sides using the same setup each time.

The results were consistently the same: the left side measured significantly quieter than the right, with the largest differences occurring in the higher frequencies, typically by around 8-10 dB across most of the frequency range, with an even larger drop in the higher frequencies (roughly above 4-8 kHz).

Because of this, simply moving the balance control to the left is not a real solution. It may compensate for volume, but it completely distorts the stereo image and the missing detail in the left channel remains.

# Ear pressure / clogged ear sensation

This is the strangest symptom. When listening to music, especially rock, I often get the sensation that my left ear is "plugged" or under pressure, almost like the feeling you get when changing altitude - but I wrote this down to the left channel imbalance.

# Tweeter hiss / harsh high frequencies

Another problem is a noticeable hissing or whistling character in songs with stronger high-frequency content. This is again much more noticeable on the left side.

The exact same tracks sound perfectly fine through headphones and on my home audio equipment, so I don't think the recordings themselves are the problem - but I have wrote this down to the speakers just being low quality, and imcapable of playing such high frequencies.

# Effect of temperature

I've also noticed what seems to be a temperature-related behavior.

When the car is cold in the morning, the speakers seem to play even quieter. As the cabin warms up, the overall volume returns to normal, but the left/right imbalance becomes more obvious.

I'm not sure whether this is actually related or if I'm imagining it, but I've noticed the pattern repeatedly.

# What I've already checked

* The issue is present regardless of source (Bluetooth, CarPlay, USB, radio, etc.)
* Equalizer adjustments do not solve it
* Moving balance/fader only masks the problem, but even with L+4 I still notice the higher frequencies are not aligned, just the volume is more "centered", but not truly.
* Phone restart and infotainment reset had no effect
* The issue existed long before any software updates and even after manually installing the newest version via usb stick the problem is not resolved

# My questions

1. Has anyone with a Kia K4 (or another recent Kia model) experienced a significant left/right imbalance like this?
2. Has anyone measured their system and found similar results?
3. Would you continue pursuing this through warranty/service, especially now that I have measurement data showing a consistent 8-10 dB difference?
4. Has anyone experienced the "plugged ear" sensation caused by a car audio system?

I can also upload the measurement screenshots if that would help.

Thanks in advance for any advice or experiences.

\# Kia K4 (Exclusive, 6-speaker audio) - Significant left/right imbalance, ear pressure sensation, tweeter hiss, and measurements showing 8-10 dB difference

Hi everyone,

About a month ago I bought a new Kia K4 Exclusive (Im from Czechia, Exclusive is the middle of the path kit) with the standard 6-speaker audio system. Overall, I'm incredibly happy with the car, but I've been struggling with the audio system since the first week of ownership and I'm trying to find out whether anyone else has experienced something similar.

\# Main issue: left and right sides do not sound the same

The entire left side of the system sounds noticeably different from the right side. The left channel is quieter, lacks high frequencies, and the overall sound feels unbalanced.

I already visited my dealer about this. They have let me in a different K4, but the it did not sound as bad as mine, maybe a small difference, but not that noticable at all. Because of that, I'm no longer sure whether this is an individual defect or something related to the factory tuning/design of the base audio system.

\# I measured it

To verify that it wasn't just my subjective impression, I performed several measurements using pink noise played from a USB drive.

I measured both channels under identical conditions and repeated the measurements multiple times. To isolate each side, I switched the balance fully to the side being measured and positioned the microphone at the corresponding seating position, approximately where the driver's or front passenger's head would normally be. The procedure was repeated for both sides using the same setup each time.

The results were consistently the same: the left side measured significantly quieter than the right, with the largest differences occurring in the higher frequencies, typically by around 8-10 dB across most of the frequency range, with an even larger drop in the higher frequencies (roughly above 4-8 kHz).

Because of this, simply moving the balance control to the left is not a real solution. It may compensate for volume, but it completely distorts the stereo image and the missing detail in the left channel remains.

\# Ear pressure / clogged ear sensation

This is the strangest symptom. When listening to music, especially rock, I often get the sensation that my left ear is "plugged" or under pressure, almost like the feeling you get when changing altitude - but I wrote this down to the left channel imbalance.

\# Tweeter hiss / harsh high frequencies

Another problem is a noticeable hissing or whistling character in songs with stronger high-frequency content. This is again much more noticeable on the left side.

The exact same tracks sound perfectly fine through headphones and on my home audio equipment, so I don't think the recordings themselves are the problem - but I have wrote this down to the speakers just being low quality, and imcapable of playing such high frequencies.

\# Effect of temperature

I've also noticed what seems to be a temperature-related behavior.

When the car is cold in the morning, the speakers seem to play even quieter. As the cabin warms up, the overall volume returns to normal, but the left/right imbalance becomes more obvious.

I'm not sure whether this is actually related or if I'm imagining it, but I've noticed the pattern repeatedly.

\# What I've already checked

\* The issue is present regardless of source (Bluetooth, CarPlay, USB, radio, etc.)
\* Equalizer adjustments do not solve it
\* Moving balance/fader only masks the problem, but even with L+4 I still notice the higher frequencies are not aligned, just the volume is more "centered", but not truly.
\* Phone restart and infotainment reset had no effect
\* The issue existed long before any software updates and even after manually installing the newest version via usb stick the problem is not resolved

\# My questions

1. Has anyone with a Kia K4 (or another recent Kia model) experienced a significant left/right imbalance like this?
2. Has anyone measured their system and found similar results?
3. Would you continue pursuing this through warranty/service, especially now that I have measurement data showing a consistent 8-10 dB difference?
4. Has anyone experienced the "plugged ear" sensation caused by a car audio system?

I can also upload the measurement screenshots if that would help.

Thanks in advance for any advice or experiences.

# Kia K4 (Exclusive, 6-speaker audio) - Significant left/right imbalance, ear pressure sensation, tweeter hiss, and measurements showing 8-10 dB difference

Hi everyone,

About a month ago I bought a new Kia K4 Exclusive (Im from Czechia, Exclusive is the middle of the path kit) with the standard 6-speaker audio system. Overall, I'm incredibly happy with the car, but I've been struggling with the audio system since the first week of ownership and I'm trying to find out whether anyone else has experienced something similar.

# Main issue: left and right sides do not sound the same

The entire left side of the system sounds noticeably different from the right side. The left channel is quieter, lacks high frequencies, and the overall sound feels unbalanced.

I already visited my dealer about this. They have let me in a different K4, but the it did not sound as bad as mine, maybe a small difference, but not that noticable at all. Because of that, I'm no longer sure whether this is an individual defect or something related to the factory tuning/design of the base audio system.

# I measured it

To verify that it wasn't just my subjective impression, I performed several measurements using pink noise played from a USB drive.

I measured both channels under identical conditions and repeated the measurements multiple times. To isolate each side, I switched the balance fully to the side being measured and positioned the microphone at the corresponding seating position, approximately where the driver's or front passenger's head would normally be. The procedure was repeated for both sides using the same setup each time.

The results were consistently the same: the left side measured significantly quieter than the right, with the largest differences occurring in the higher frequencies, typically by around 8-10 dB across most of the frequency range, with an even larger drop in the higher frequencies (roughly above 4-8 kHz).

Because of this, simply moving the balance control to the left is not a real solution. It may compensate for volume, but it completely distorts the stereo image and the missing detail in the left channel remains.

# Ear pressure / clogged ear sensation

This is the strangest symptom. When listening to music, especially rock, I often get the sensation that my left ear is "plugged" or under pressure, almost like the feeling you get when changing altitude - but I wrote this down to the left channel imbalance.

# Tweeter hiss / harsh high frequencies

Another problem is a noticeable hissing or whistling character in songs with stronger high-frequency content. This is again much more noticeable on the left side.

The exact same tracks sound perfectly fine through headphones and on my home audio equipment, so I don't think the recordings themselves are the problem - but I have wrote this down to the speakers just being low quality, and imcapable of playing such high frequencies.

# Effect of temperature

I've also noticed what seems to be a temperature-related behavior.

When the car is cold in the morning, the speakers seem to play even quieter. As the cabin warms up, the overall volume returns to normal, but the left/right imbalance becomes more obvious.

I'm not sure whether this is actually related or if I'm imagining it, but I've noticed the pattern repeatedly.

# What I've already checked

* The issue is present regardless of source (Bluetooth, CarPlay, USB, radio, etc.)
* Equalizer adjustments do not solve it
* Moving balance/fader only masks the problem, but even with L+4 I still notice the higher frequencies are not aligned, just the volume is more "centered", but not truly.
* Phone restart and infotainment reset had no effect
* The issue existed long before any software updates and even after manually installing the newest version via usb stick the problem is not resolved

# My questions

1. Has anyone with a Kia K4 (or another recent Kia model) experienced a significant left/right imbalance like this?
2. Has anyone measured their system and found similar results?
3. Would you continue pursuing this through warranty/service, especially now that I have measurement data showing a consistent 8-10 dB difference?
4. Has anyone experienced the "plugged ear" sensation caused by a car audio system?

I can also upload the measurement screenshots if that would help.

Thanks in advance for any advice or experiences.

Kia K4 (Exclusive, 6-speaker audio) - Significant left/right imbalance, ear pressure sensation, tweeter hiss, and measurements showing 8-10 dB difference

Hi everyone,

About a month ago I bought a new Kia K4 Exclusive (Im from Czechia, Exclusive is the middle of the path kit) with the standard 6-speaker audio system. Overall, I'm incredibly happy with the car, but I've been struggling with the audio system since the first week of ownership and I'm trying to find out whether anyone else has experienced something similar.

Main issue: left and right sides do not sound the same

The entire left side of the system sounds noticeably different from the right side. The left channel is quieter, lacks high frequencies, and the overall sound feels unbalanced.

I already visited my dealer about this. They have let me in a different K4, but the it did not sound as bad as mine, maybe a small difference, but not that noticable at all. Because of that, I'm no longer sure whether this is an individual defect or something related to the factory tuning/design of the base audio system.

I measured it

To verify that it wasn't just my subjective impression, I performed several measurements using pink noise played from a USB drive.

I measured both channels under identical conditions and repeated the measurements multiple times. To isolate each side, I switched the balance fully to the side being measured and positioned the microphone at the corresponding seating position, approximately where the driver's or front passenger's head would normally be. The procedure was repeated for both sides using the same setup each time.

The results were consistently the same: the left side measured significantly quieter than the right, with the largest differences occurring in the higher frequencies, typically by around 8-10 dB across most of the frequency range, with an even larger drop in the higher frequencies (roughly above 4-8 kHz).

Because of this, simply moving the balance control to the left is not a real solution. It may compensate for volume, but it completely distorts the stereo image and the missing detail in the left channel remains.

Ear pressure / clogged ear sensation

This is the strangest symptom. When listening to music, especially rock, I often get the sensation that my left ear is "plugged" or under pressure, almost like the feeling you get when changing altitude - but I wrote this down to the left channel imbalance.

Tweeter hiss / harsh high frequencies

Another problem is a noticeable hissing or whistling character in songs with stronger high-frequency content. This is again much more noticeable on the left side.

The exact same tracks sound perfectly fine through headphones and on my home audio equipment, so I don't think the recordings themselves are the problem - but I have wrote this down to the speakers just being low quality, and imcapable of playing such high frequencies.

Effect of temperature

I've also noticed what seems to be a temperature-related behavior.

When the car is cold in the morning, the speakers seem to play even quieter. As the cabin warms up, the overall volume returns to normal, but the left/right imbalance becomes more obvious.

I'm not sure whether this is actually related or if I'm imagining it, but I've noticed the pattern repeatedly.

What I've already checked

• The issue is present regardless of source (Bluetooth, CarPlay, USB, radio, etc.)
• Equalizer adjustments do not solve it
• Moving balance/fader only masks the problem, but even with L+4 I still notice the higher frequencies are not aligned, just the volume is more "centered", but not truly.
• Phone restart and infotainment reset had no effect
• The issue existed long before any software updates and even after manually installing the newest version via usb stick the problem is not resolved

My questions

1. Has anyone with a Kia K4 (or another recent Kia model) experienced a significant left/right imbalance like this?
2. Has anyone measured their system and found similar results?
3. Would you continue pursuing this through warranty/service, especially now that I have measurement data showing a consistent 8-10 dB difference?
4. Has anyone experienced the "plugged ear" sensation caused by a car audio system?

I can also upload the measurement screenshots if that would help.

Thanks in advance for any advice or experiences.

Hi everyone,

About a month ago I bought a new Kia K4 Exclusive (Im from Czechia, Exclusive is the middle of the path kit) with the standard 6-speaker audio system. Overall, I'm incredibly happy with the car, but I've been struggling with the audio system since the first week of ownership and I'm trying to find out whether anyone else has experienced something similar.

Main issue: left and right sides do not sound the same

The entire left side of the system sounds noticeably different from the right side. The left channel is quieter, lacks high frequencies, and the overall sound feels unbalanced.

I already visited my dealer about this. They have let me in a different K4, but the it did not sound as bad as mine, maybe a small difference, but not that noticable at all. Because of that, I'm no longer sure whether this is an individual defect or something related to the factory tuning/design of the base audio system.

I measured it

To verify that it wasn't just my subjective impression, I performed several measurements using pink noise played from a USB drive.

I measured both channels under identical conditions and repeated the measurements multiple times. To isolate each side, I switched the balance fully to the side being measured and positioned the microphone at the corresponding seating position, approximately where the driver's or front passenger's head would normally be. The procedure was repeated for both sides using the same setup each time.

The results were consistently the same: the left side measured significantly quieter than the right, with the largest differences occurring in the higher frequencies, typically by around 8-10 dB across most of the frequency range, with an even larger drop in the higher frequencies (roughly above 4-8 kHz).

Because of this, simply moving the balance control to the left is not a real solution. It may compensate for volume, but it completely distorts the stereo image and the missing detail in the left channel remains.

Ear pressure / clogged ear sensation

This is the strangest symptom. When listening to music, especially rock, I often get the sensation that my left ear is "plugged" or under pressure, almost like the feeling you get when changing altitude - but I wrote this down to the left channel imbalance.

Tweeter hiss / harsh high frequencies

Another problem is a noticeable hissing or whistling character in songs with stronger high-frequency content. This is again much more noticeable on the left side.

The exact same tracks sound perfectly fine through headphones and on my home audio equipment, so I don't think the recordings themselves are the problem - but I have wrote this down to the speakers just being low quality, and imcapable of playing such high frequencies.

Effect of temperature

I've also noticed what seems to be a temperature-related behavior.

When the car is cold in the morning, the speakers seem to play even quieter. As the cabin warms up, the overall volume returns to normal, but the left/right imbalance becomes more obvious.

I'm not sure whether this is actually related or if I'm imagining it, but I've noticed the pattern repeatedly.

What I've already checked

• The issue is present regardless of source (Bluetooth, CarPlay, USB, radio, etc.)
• Equalizer adjustments do not solve it
• Moving balance/fader only masks the problem, but even with L+4 I still notice the higher frequencies are not aligned, just the volume is more "centered", but not truly.
• Phone restart and infotainment reset had no effect
• The issue existed long before any software updates and even after manually installing the newest version via usb stick the problem is not resolved

My questions

1. Has anyone with a Kia K4 (or another recent Kia model) experienced a significant left/right imbalance like this?
2. Has anyone measured their system and found similar results?
3. Would you continue pursuing this through warranty/service, especially now that I have measurement data showing a consistent 8-10 dB difference?
4. Has anyone experienced the "plugged ear" sensation caused by a car audio system?

I can also upload the measurement screenshots if that would help.

Thanks in advance for any advice or experiences.

Hi everyone,

About a month ago I bought a new Kia K4 in the Exclusive trim, and I'm extremely happy with the car overall — the only thing bothering me is the audio system (the base 6-speaker setup).

1) Left/right imbalance
The left row of speakers sounds noticeably different from the right. I took it to the dealer — they sat me in a different K4, and the difference between the left and right channel was there too. So it doesn't look like a fault with just my car, but rather a characteristic of the whole system or the factory tuning.

2) Temperature influence
It seems to me that the speakers are also affected by outside temperature. When it's cold in the morning, they play noticeably quieter until the car "warms up." Conversely, when it's warm during the day, the volume is normal, but the difference between the left and right side is even more pronounced.

3) Feeling of a blocked ear
I haven't experienced this in any other car: when listening to music (mostly rock), I feel like my left ear is getting blocked. It's really unpleasant, and I suspect a problem with phase or sound asymmetry.

4) Whistling in the high frequencies
On tracks with more pronounced high tones, there's a "whistling" coming from the speakers — again, more from the left side. The same tracks play cleanly on headphones and on my home speakers, so I attribute it to the quality of the base system.

What I've already tried / verified:

• The problem shows up the same across all music sources (Bluetooth, CarPlay, radio…)
• I've tuned the EQ, but because of the imbalance there's nothing that can be done about it
• I tried shifting the balance/fader, but that completely throws off the overall sound — it then plays weirdly
• Phone restart, force restart of the infotainment — no effect
• I noticed the problem already in the second week after taking delivery, and no SW update has happened in the meantime, so it doesn't look like something caused by an update

I drive the car 3× a week and spend over 4 hours a day in it, so it's impossible not to notice these things, and it's starting to get really annoying.

So I wanted to ask — has anyone here run into something similar? Even just one of these problems. I'd mainly be interested to know whether that side imbalance is "normal" on the K4 across all units.

Thanks in advance for any answers and experiences.