Audio Interface vs Headphone Amp
Updated Nov 13, 2026 · By 
Jonah Mercer · Editorial policy
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An audio interface records a microphone or instrument into the computer, while a headphone amp only drives headphones louder from a source that already plays audio. The interface has mic preamps, inputs and a converter; the amp has a volume control and a headphone output. Pick the interface to record.
What an audio interface does
An audio interface turns a microphone or instrument signal into digital audio for the computer, and turns computer audio back out to headphones or monitors. The Scarlett Solo 3rd Gen takes a mic on the XLR preamp and a guitar on the Hi-Z instrument input, with 56dB of gain range and an Air mode on the preamp. The MOTU M2 takes two mics on two preamps, with hardware monitoring and LCD meters for the levels. Some interfaces also supply 48V phantom power to condenser mics: the M-Track Duo does so on its combo inputs.
What a headphone amp does
A headphone amp takes an audio signal that already exists and drives headphones from it. Its place is at the listening end: between a source and the headphones, where the volume control sets the level. An amp suits a listener whose headphones need more drive from an existing source, not a player who needs to record a mic or an instrument.
Inputs, outputs and monitoring compared
Count the inputs. The Scarlett Solo 3rd Gen and 4th Gen each have an XLR mic preamp and a Hi-Z instrument input, while the MOTU M2 has two preamps and the M-Track Duo has two combo XLR, line and instrument inputs. For listening, the Solo 3rd Gen has low-noise balanced outputs and a headphone jack for private listening, the MOTU M2 has an ESS-driven headphone output with volume, and the M-Track Duo has a 1/4-inch headphone output with a USB/Direct switch for zero latency monitoring. A headphone amp gives a volume control and a headphone output only, with no inputs for a mic or an instrument.
Which device fits the job
Pick an interface when the job is recording: the Solo 3rd Gen and 4th Gen take a mic and a guitar with 24-bit/192kHz converters, the MOTU M2 takes two mics with hardware monitoring, and the M-Track Duo takes two combo inputs with 48V phantom power at 48 kHz. Pick a headphone amp when the job is listening only and the headphones need more drive from a source that already plays. The Solo 4th Gen adds a 120dB dynamic range and Air modes for the recording side, while the M-Track Duo includes Ableton Live Lite and MPC Beats software for the session.
What you need
Focusrite Scarlett Solo 3rd Gen USB-C Audio
A USB-C interface with an XLR mic preamp, a Hi-Z instrument input, 24-bit/192kHz converters, a 56dB gain range and an Air mode.
- Inputs: 2
- Mic preamps: 1
- Max sample rate: 192 kHz
- Bit depth: 24-bit
- Software named in listing: Pro Tools Intro
- 3-year warranty stated
MOTU M2 USB-C Audio Interface
A USB-C interface with two preamps, 2-in/2-out recording at 24-bit/192kHz, hardware monitoring, LCD meters and MIDI in and out.
- Inputs: 2
- Mic preamps: 2, the most here
- Outputs: 2
- Max sample rate: 192 kHz
- Bit depth: 24-bit
- 2-year warranty stated
M-AUDIO M-Track Duo USB Audio Interface Dual
A USB interface with two combo XLR, line and instrument inputs, 48V phantom power, 48 kHz audio and a 1/4-inch headphone output.
- Inputs: 2
- Max sample rate: 48 kHz
- 48V phantom power
- Software named in listing: Ableton Live Lite
- 0.7 lb, the lightest here
Focusrite Scarlett Solo 4th Gen USB-C Audio
A USB-C interface with an XLR mic preamp, a Hi-Z instrument input, 24-bit/192kHz converters, a 120dB dynamic range and Air modes.
- Inputs: 2
- Mic preamps: 1
- Max sample rate: 192 kHz
- Bit depth: 24-bit
- Software named in listing: Pro Tools Intro
These come from our ranked list Best Audio Interface, which compares them spec by spec.
Frequently asked questions
Do I need an interface if I only listen to music?
No. Listening only needs a source and headphones, and a headphone amp drives the headphones when more level is needed. An interface is for recording a microphone or an instrument into the computer.
Can a headphone amp record a microphone?
No. Recording a mic needs an interface with an XLR input and a preamp.
Which interface here has two mic preamps?
The MOTU M2 has two preamps, with 2-in/2-out recording at 24-bit/192kHz, hardware monitoring and LCD meters. The Scarlett Solo models have an XLR mic preamp and a Hi-Z instrument input each.
Ranked audio interfaces lists
More how-to guides
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