Guides · Equipment

The best audio interfaces for recording an audiobook

Picks under $150, under $250 and under $400, and the boosters a low-output microphone needs, chosen for one job: one voice, recorded cleanly, for hours. Prices are US street prices as of October 2026.

By StellAurator · Updated October 12, 2026 ·

What an interface does

An audio interface connects an XLR microphone to the computer. It supplies the 48 V phantom power a condenser microphone needs, amplifies the microphone’s small signal with a preamp, converts it to digital audio, and sends it to the computer over USB. It also has a headphone output, so the reader hears the recording while it is made.

A USB microphone has a small interface built in and needs none of this. The microphone guide covers both kinds.

What matters for narration

  • One clean microphone preamp with enough gain. A condenser microphone needs about 40 to 50 dB of gain; a low-output dynamic such as the SM7B needs about 60 dB. A preamp near the top of its range adds hiss, which raises the noise floor ACX measures.
  • 48 V phantom power. Every condenser microphone and every inline booster needs it. Every interface on this page has it.
  • A headphone output with direct monitoring. Direct monitoring sends the microphone straight to the headphones without a trip through the computer, so the voice is heard with no delay.
  • USB-C. Every interface on this page connects with USB-C and is powered by the computer; none needs a power adapter.
  • A Windows driver from the maker. A dedicated driver (ASIO) gives a lower and steadier delay than the general Windows audio driver. StellAurator connects to an interface directly through its driver, with the lowest delay the hardware allows.
  • Inputs. One voice needs one microphone input. A second input is useful for a second narrator or a guest; a second headphone output is useful for a director.

Our picks

Under $150

One microphone input is enough for one narrator, and the interfaces at this price do that one job well.

Focusrite Scarlett Solo (4th Gen)

Focusrite Scarlett Solo (4th Gen)

Our pick USB-C One microphone input About $140 to $160

One microphone input with 48 V phantom power and 57 dB of gain, an instrument input, a headphone output with a direct monitor switch, and a Windows driver from the maker. It has enough clean gain for every condenser microphone and for the SM7dB, which is all most narrators need. Manufacturer’s website

Its list price is $139.99 and many stores sell it for about $160. The SM7B and the RE20 need a booster in front of it.

Under $250

This tier adds a second input, more gain, or a second headphone output.

Focusrite Scarlett 2i2 (4th Gen)

Our pick USB-C Two microphone inputs About $200 to $225

Two microphone inputs with 48 V phantom power and 69 dB of gain, enough for most dynamic microphones without a booster. Auto Gain sets the input level from a short sample of the voice, and Clip Safe turns the gain down before a sudden loud line can clip. It has a headphone output with direct monitoring and a Windows driver from the maker. Manufacturer’s website

The second input is for a second narrator or a guest. One voice needs one.

MOTU M2

MOTU M2

USB-C Two microphone inputs About $200

Two microphone inputs with 48 V phantom power, very quiet preamps, and a full-color level meter on the front panel that shows the input level at a glance while you read. It has a headphone output with a direct monitoring button and a Windows driver from the maker. Manufacturer’s website

The meters are the easiest on this page to read from a distance. The SM7B still needs a booster in front of it.

Audient iD4 MkII

Audient iD4 MkII

USB-C One microphone input About $200 to $270

One microphone input with the preamp from Audient’s studio consoles and 48 V phantom power, an instrument input, and two headphone outputs, for a director or a second listener. It has direct monitoring and a Windows driver from the maker. Manufacturer’s website

Prices vary widely between stores. Most sit between $200 and $270.

Under $400

One interface in this tier, for a session with a director or a second narrator.

Solid State Logic SSL 2+ MkII

Solid State Logic SSL 2+ MkII

Our pick USB-C Two microphone inputs About $300

Two microphone inputs with 48 V phantom power and 64 dB of gain, two headphone outputs with their own volume controls, and four line outputs. For narration its value is in the second headphone output and the extra gain: a director can listen on separate headphones, and a low-output dynamic microphone needs less help. Manufacturer’s website

The smaller SSL 2 MkII has one headphone output and costs about $230.

Boosters for the SM7B and other low-output microphones

A booster is a small box that sits between the microphone and the interface and adds clean gain before the preamp. It is for a low-output dynamic microphone on an interface without enough gain of its own. A 69 dB interface such as the Scarlett 2i2 does without one.

Cloud Microphones Cloudlifter CL-1

Cloud Microphones Cloudlifter CL-1

Our pick Inline booster XLR About $115 to $160

An inline booster that sits between a low-output dynamic microphone and the interface and adds up to about 25 dB of clean gain, powered by the interface’s 48 V phantom power. With it, the SM7B and the RE20 reach a good recording level without the interface’s preamp running at its noisiest setting. Manufacturer’s website

It is for dynamic and ribbon microphones only. A condenser and the SM7dB do not need it.

sE Electronics DM1 Dynamite

sE Electronics DM1 Dynamite

Inline booster XLR About $80 to $130

A smaller and less expensive booster that plugs directly into the bottom of the microphone and adds about 28 dB of clean gain, also from phantom power. Manufacturer’s website

Like the Cloudlifter, it is for passive dynamic and ribbon microphones only.

How this guide was made

The picks are chosen for spoken word, not for recording a band. Prices are US street prices checked at several retailers in October 2026. The store’s price is the one that counts. Specifications are the makers’ own. No manufacturer or retailer paid for a place on this page. Product photographs are the makers’ own; where a maker’s site did not answer, a drawing stands in.

Record the book in StellAurator

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