Creative SB1590 User Manual page 26

Recording audio to an iOS mobile device
You can record audio to your iOS mobile device using the built-in microphones of the Sound Blaster E5,
or an external microphone connected to the Sound Blaster E5.
Use a voice recording application on your mobile device to record audio.
Microphone array orientation
The built-in stereo microphones with horizontal or vertical orientation sensor creates a beamforming
microphone array that works together with CrystalVoice technology to ensure crystal clear recording.
Note:
The built-in microphones will be disabled automatically when an external microphone is connected.
Sound Blaster E5 – Using Your Audio Device 25