Skip to content

Or for more help...

Courses & Coaching?

Automated Editing?

Focusrite Scarlett 18i8 Second Generation – A Podcasting Review

I'm a long time admirer of Focusrite gear. The English audio equipment manufacturer has an outstanding global reputation for developing some of the best kit on the market.

I've been using the Focusrite Scarlett 18i8 Second Generation‘s little brother – the 2i2 – for a few years now, and I think it's a fantastic USB preamp.

A lot of podcasters ask us about recording more than 2 microphones into individual channels at the same time though. This is something you can do with the Scarlett 18i8, so I thought it was time to check it out.

Who Would Use the Focusrite Scarlett 18i8?

  • Someone who wants to record directly into their computer editing software (DAW)
  • Someone who wants to record 3-8 people onto their own individual audio tracks

Recording audio from multiple participants onto individual tracks gives you much greater control, both in the recording stage, and in the editing process.

Podcasters who run 'roundtable' style discussion with everyone gathered together in the same room would really benefit from using something like this. Alternatively, audio drama producers who want to record 3-8 voice actors in a scene together would find it ideal too.

What Software Do I Need?

Scarlett 18i8 with Adobe Audition

Recording with 4 mics inside Adobe Audition

With any USB preamp, you need to record into a Digital Audio Workstation (DAW) on your computer.

Firstly, you won't be able to get the best out of your Scarlett 18i8 if you record with Audacity. You can still edit and put together your show in Audacity, so don't worry if that's the software you're most familiar with, and recording audio in another DAW is fairly straightforward.

Need Help Launching Your Podcast?

We'll show you the exact steps, give you a launch schedule & help you along the way.

Check out the Course

The Scarlett 18i8 comes with versions of Ableton and Pro Tools, or you can use something like Reaper or Adobe Audition.

You also need to download the Focusrite Control software (which is free) from the company's website before you can use it on your Mac or PC.


You need to plug the Scarlett 18i8 in via its mains adaptor to power it. It connects to your Mac/PC with the USB cable provided, and has an on/off switch on the back.

There's 4 XLR/1/4″ (combo) inputs on the front for plugging your microphones into. Each has its own gain dial to control the mic sensitivity.

Also on the front of the 18i8, there are some output controls. Two different headphone ports that you can plug in and monitor your recordings with. These are 1/4″ ports and have their own individual volume controls, as well as a mute button.

There's also a volume dial for monitors/speakers if you're connected to any, as well as phantom power buttons to switch on and power condenser mics if you're using them.

On the rear you'll find inputs 5-8, in the form of 1/4″ ports.

The first two inputs (1-2) are capable of being either Mic (XLR), Instrument (1/4”) or Line level (1/4”), inputs 3-4 are either Mic or Line level, and the four rear inputs are Line level only

There's an optical ADAT input port, which gives you the option to connect another preamp (with an ADAT output port, via a TOSLINK optical cable), this can provide up to an additional 8 audio inputs for your recordings if your second preamp supports them. For 99.9% of podcasters this will never be relevant, but the option is there if you need it.

You probably won't ever use the MIDI or SPDIF inputs/outputs on the back either if you're just working with spoken word content, but again, they're there if you need them.

What Does The Scarlett 18i8 Sound Like

That does depend on your microphone, but you can be assured that it'll get the best out of whatever you plug into it.

In this sound sample I was using the MXL990. I haven't processed/treated the recording in any way. It was recorded in semi-sound dampened conditions.

How Much Does It Cost?

The latest Amazon prices are £275 in the UK, and $350 in the USA.


The Focusrite Scarlett 18i8 Second Generation is overkill for most podcasters, because it has more inputs than most people will need.

If you run a solo show, co-hosted show, on location or Skype interview show, then I'd absolutely go with the Scarlett 2i2 instead if you're looking for a quality USB preamp.

But if you want to have 3 or more input options for on location recordings into your PC or Mac, then this is the best option I've come across so far.

The 18i8 has all the quality and characteristics we've come to expect from Focusrite over the years, and I've thoroughly enjoyed using it so far.

It is, without a doubt, the device I'll be recommending for multi-input, multi-channel USB recording from now on.


  1. Kevin on 10th October 2016 at 1:08 am

    Thanks for the review. I was all set on setting up a mixer-digital recorder setup, but this article has me second-guessing.

    Am I understanding correctly that an audio interface like the Scarlett allows you to record all tracks as separate tracks to your computer (to be handled in post-prod), whereas a mixer would only send a maximum of two channels (Left and Right) to the digital recorder? (Is this also the case for mixer’s with USB out – in that they also only send L/R to the PC?)

    So, how do I make my decision? Is it better to control all the channels individually during the recording, or have them all separated for editing on the PC in post-prod.

    (I’m getting ready to launch a podcast, normally a 1-1 over Skype but also the possibility of having me + 2 guests in person).

    Thanks for your time,

    • Matthew McLean on 11th October 2016 at 12:19 pm

      Hi Kevin. Most mixers will just give you the L/R option yes. And you’re right, the 18i8 allows you to record everyone present to record onto their own individual channel. The 18i8 is a great preamp, but you might still want to get a mixer instead, if you wanted to do a mix minus Skype recording setup. But if you plan on recording your Skype interviews online with something like Ecamm, then the 18i8 or 2i2 could be ideal.

  2. Wren on 21st November 2016 at 4:30 pm

    We are looking to record 2 live hosts at one location, with a third host being remote over Skype as well as having another guest on over Skype would the Focusrite 18i8 handle this situation? We will also be sending out mixed show over to a radio station for live broadcast. Yes this is all happening at the same time.

    • Matthew McLean on 22nd November 2016 at 2:59 pm

      Hi Wren, getting multiple remote guests on their own independent channels can require a lot of extra equipment. I’d look at the Zencastr or Cast apps as recording options, or if possible, ask your guests to record their own audio at their end.

  3. Trevor on 3rd December 2016 at 4:32 am

    I have 4 at2035 mics and im trying to record 4 peoples audio with adobe audition and it only reads input 1 and 2 but not 3 and 4

    • Matthew McLean on 5th December 2016 at 11:38 am

      Hi Trevor, here’s a video I made hopefully that should help you get up and running

      • Trevor on 6th December 2016 at 8:50 am

        Thanks for your help do you know how to get all 4 mics to work for OBS so I can Stream with 4 mics?

        • Matthew McLean on 7th December 2016 at 2:18 pm

          With any app/program you’re using you’ll want to set the 18i8 as your input device.

          • trevor on 24th January 2017 at 5:20 am

            I have the 18i8 selected as the default recording device but it only reads the first two channels. so in obs it is the input device but only get the first two mics/first two channels. do you know of a solution?

        • Alex on 28th May 2018 at 8:22 pm

          I am trying to figure out this same thing! Man this difficult.

          • Matt on 30th January 2019 at 3:49 am

            Anyone figure this out, I have the same problem with OBS. I only get 2 channels

  4. Jason on 15th December 2016 at 6:51 am

    Our podcast uses the 18i8 and it works great. However, when we do a Skype call using call recorder, we’ve run into a problem. We can hear our Skype guest just fine, but the guest can only hear one mic from our side. Is there a setting where the Skype guest can hear both of our mics? We use Garage Band to record and it picks up both mics at the same time call recorder is running, but call recorder only recognizes one mic I’ve thought about buying a small mixer like a Yamaha MG6 or 10 to combine both of our mics onto one mic input on the 18i8 just for Skype calls, but I don’t know if that will actually work or not. Any thoughts?

    • Matthew McLean on 20th December 2016 at 12:48 pm

      Hi Jason, this is an issue with Skype yes. It only seems to regognise the 1st port in any USB audio interface. A couple of workarounds are, 1 – to use an XLR splitter to feed both your mics into that port, or 2 – to share a USB mic for the purpose of Skype and your interviewee hearing you both, but at the same time, continue to record both your audio tracks independently at your end in your DAW.

  5. Gary on 20th February 2017 at 1:08 am

    I just got the 18i8 for a podcast. It will be used to record in a slightly loud atmosphere with background noise.

    I am new at this, I just need to know, how loud should I have the mic volume set on the scarlett? should the volume knobs be pointing at 1 o clock?

    • Matthew McLean on 20th February 2017 at 9:23 am

      Hi Gary. Your gain setting really depends on how loud the voices are that you’re recording, and also what kind of mics you are using. Use the meters inside your DAW (recording/editing software) to determine this – I usually look for my spoken word recordings to be peaking between -12 and -9

  6. ODILON on 9th July 2017 at 3:03 pm

    I recently bought the Scarlett 18i8 but my Mac is only reading 2 inputs and I need 4 mics in use. What should I do ?

    • Matthew McLean on 10th July 2017 at 10:41 am

      Hi, what DAW is it that you’re using?

  7. Odilon on 11th July 2017 at 4:06 am

    Garage band

    • Matthew McLean on 11th July 2017 at 11:19 am

      Afraid I don’t have much experience with Garageband, sorry. I’ve never used it with an interface such as the 18i8 before. Worth trying the ‘Enable Multitrack Recording’, that might get you up and running.

      • Odilon on 11th July 2017 at 1:53 pm

        How about logic x pro?

        • Peter Johnson on 3rd July 2018 at 11:36 pm

          It works well with Logic Pro X

  8. Peter Johnson on 3rd July 2018 at 11:40 pm

    I think the review is a little misleading when it suggests you can record up to 8 microphones. I would suggest this should say “up to 4 microphones and a further 4 line-level sources” and only the 4 XLR inputs carry phantom power.

    To record a 5-person podcast I think I needed the 18i20, which works great.

  9. Elizabeth on 24th June 2019 at 1:03 am

    I can’t get any levels in GarageBand when I try to Skype someone using my Scarlett 8i8. Any advice on what I’m doing wrong?

  10. Declan O'Connell on 12th September 2019 at 3:12 am

    Been doing research on FocusRite products and purchased the 2i2. Starting a podcast but wondering if I made the right purchase or if I should get the 18i8. The show would be having 3 guests minimum per episode and sometimes 4. What’s the best interface for what I’m looking for? Because the 2i2 can only have two microphones plugged into it, so if I’m looking at doing 3-4 people needing microphones is my best best the 18i8?

Written by:

Matthew McLean

Matthew is an audio drama writer and producer who enjoys talking about podcasts. He makes the tea at The Podcast Host, and is a loyal servant of adopted house rabbits.

September 14th 2016
Share via
Copy link