Line-Level Audio Input Adapter for iPhone & Smartphones

  • Record line-level sound on iPhone, smartphone
  • Old Mic-Line side view
  • Updated line level port
  • Use mixer, soundboard with iPhone, smartphone
  • 3.5 mm CTIA lead
*Due to out-of-stock, all orders of this will be replaced with Mic-Line-Plus. This attenuator cable simply replaces your smartphone's audio signal with line level input allowing you to record sound directly from a soundboard or mixer.
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Because this item to out-of-stock, we will be replacing all orders of iPhone-Mic-Line with Mic-Line-Plus, which has the same (and more) functionality.

  • Record line level audio from your mixer or soundboard on your iPhone, smartphone.
  • Allows your external audio output to replace your smartphone's mic. Includes line mic attenuator that allows for line-level to mic-level conversion
  • Works with most phones that have a combined headset and microphone jack
  • Connect two audio sources simultaneously, just use a splitter!
  • Crystal clear sound recording, 100% guaranteed

Our line level input converter allows you to record audio on your iPhone from outputs such as a headphone jack or audio output jack such as a turn tables, mixers, soundboards or other professional audio equipment. The iPhone-Mic-Line replaces your phone's microphone level audio signal with line level input allowing you to record on your device as if the sound was coming directly from it.

The cable is approximately 13 inches long.

How it Works: Insert the male 3.5mm (1/8 in.) TRRS plug into your iPhone or smartphone, and then plug your audio source into the female 3.5mm (1/8 in.) TRS end of the Headset Buddy adapter. The handheld device will recognize that an external audio source is connected and turn its internal microphone off allowing you to record using the external source. This adapter works with all audio/video recording apps and other functions just as the internal mic would.

PLEASE NOTE: This adapter is NOT for recording from microphones. Please see our "Dynamic Mic to Smartphone" or "ECM Mic to Smartphone" adapters for these purposes. Also, sound input for smartphone connections is mono but most apps split the sound into left and right channels for playback in both ears. You are able to input stereo sound; however, playback will only be in the left ear.

Our friends over at @studioscratches have put together a nice article on "How to Record High Quality Audio Directly into Your iPhone"


Q: Will this adapter work with a stereo audio source?

A: The combined headset jack on the iPhone and other devices only has a mono mic input so you cannot record in stereo. Most recording apps split the mono signal into both left/right channels when recording so the audio will play back in both ears. You can connect a stereo signal to this adapter but only the left side will be active; if you use a stereo-to-mono adapter on your input cable then it will make both left/right channels combined and active. There is a new stereo microphone product available which will allow for stereo recording using the docking connector; this is currently the only option available for stereo recording, Tascam IM2 stereo mic.

Q: Do I need a different adapter for a microphone?

A: The iPhone headset mic input is a mic-level input. The mic-level signal is much lower than a line-level signal which is used in audio outputs. This adapter has a built-in attenuator which reduces line-level signals down to mic-level signal strength. If you connect a mic to this adapter the signal would be reduced to a point that you would not be able to hear it in a recording. Use the MIC versions of this adapter for recording from microphones.

Q: Can I connect two audio sources?

A: Yes, you can use a standard 3.5mm splitter adapter to connect two audio sources which will combine the signals from both sources into this adapter. Alternately, you could use a small mixer to combine the signals from multiple sources into this adapter. or purchase our new product, the Mic-Line Plus

Q: Will this work with the latest versions of iPhone that have removed the 3.5 mm headphone jack?

A: Yes! However you will need to use either the lightning to 3.5mm adapter that came with your iPhone or purchase one of ours, which can be found here

Product Info

Attenuation: 10 dB

Cable Lenght: 12 inches


Free returns, always!

We have a 30-day, no-questions-asked return policy for all of our products as well as a one-year, 100% Satisfaction guarantee; We’ll replace your Headset Buddy for free within the first 12 months.

For further information about Headset Buddy's Warranty and Shipping & Returns policies select the imbedded links

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Compatible Devices

iPhone 5, 5s, SE, 6, 6 Plus, 6s, 6s Plus

iPhone 7, 7s, 8 and iPhone X will need to be used with a 3.5mm to lightning adapter. Our's can be found here and here

iPad and iPod

Macbook, Macbook Air and Pro, Mac Mini and Pro

Android smartphones and devices

Windows phones


Compatible Audio Sources

"Line" audio such as a headphone jack on another device (smartphone, computer, etc.)

Mixers and soundboards with line-level outputs

Headphone outputs

Incompatible Devices

Older Samsung Galaxy models and the Samsung Galaxy Note 5

iPhone 4s and below

Select Motorola Droid models

Incompatible Audio Sources

Microphone - use the microphone version adapters

Outputs that are mic-level

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