Asus Zenfone 4 Max (ZC520KL) vs Asus Zenfone 4 Max (ZC554KL): What is the difference?
has a socket for a 3.5 mm audio jack
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Asus Zenfone 4 Max (ZC520KL)
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Asus Zenfone 4 Max (ZC554KL)
With a standard mini jack socket, you can use the device with most headphones.
has stereo speakers
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Asus Zenfone 4 Max (ZC520KL)
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Asus Zenfone 4 Max (ZC554KL)
Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.
has aptX
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Asus Zenfone 4 Max (ZC520KL)
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Asus Zenfone 4 Max (ZC554KL)
aptX is a codec used for transmitting audio wirelessly with Bluetooth. It is developed by Qualcomm, and supports 16-bit audio at a bit rate of 384kbps.
has LDAC
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Asus Zenfone 4 Max (ZC520KL)
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Asus Zenfone 4 Max (ZC554KL)
LDAC is a codec developed by Sony for Bluetooth audio. It is capable of a very high bitrate of 990kbps, which provides high resolution audio. It can also automatically adjust to a lower bitrate of 330kbps or 660kbps to increase stability.
has aptX HD
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Asus Zenfone 4 Max (ZC520KL)
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Asus Zenfone 4 Max (ZC554KL)
aptX HD is an audio codec for Bluetooth devices that is developed by Qualcomm. It supports high quality 24-bit audio (at a bit rate of 576kbps).
has aptX Adaptive
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Asus Zenfone 4 Max (ZC520KL)
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Asus Zenfone 4 Max (ZC554KL)
aptx Adaptive is an audio codec for Bluetooth devices that is developed by Qualcomm. It has a variable bit rate (between 279kbps and 420kbps), which means it can adjust the bit rate for different scenarios, such as listening to HD audio or reducing interference from other devices.
Has a radio
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Asus Zenfone 4 Max (ZC520KL)
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Asus Zenfone 4 Max (ZC554KL)
A built-in FM radio tuner allows you to listen to most of the live-broadcasted FM radio stations without using the internet.
number of microphones
1
2
More microphones result in better sound quality and enable the device to filter out background noise.
Has dedicated media keys
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Asus Zenfone 4 Max (ZC520KL)
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Asus Zenfone 4 Max (ZC554KL)
Phones with physical keyboards have dedicated media keys, such as: play, stop, next, previous, volume up/down, etc.
