These specifications allow you to compare your 18i20 4th Gen with other devices and make sure they’ll work together. If you’re not familiar with these specifications, don’t worry you don’t need to know this information to use your 18i20 4th Gen with most devices
Where possible, we measure all performance figures following AES17.
|
Supported Sample Rates |
44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz |
|
Bit Depth |
24-bit |
|
Microphone inputs |
|
|---|---|
|
Frequency Response |
20Hz - 20kHz ± 0.06dB |
|
Dynamic Range (A-weighted) |
116dB |
|
THD+N |
-100dB @ 8dB gain |
|
Noise EIN (A-Weighted) |
-127dBu |
|
Maximum Input Level (at minimum gain) |
16dBu |
|
Gain Range |
69dB |
|
Input Impedance |
3kΩ |
|
Line Inputs |
|
|---|---|
|
Frequency Response |
20Hz - 20kHz ± 0.05dB |
|
Dynamic Range (A-weighted) |
115.5dB |
|
THD+N |
-100dB @ 8dB gain |
|
Maximum Input Level (at minimum gain) |
22dBu |
|
Gain Range |
69dB |
|
Input Impedance |
24kΩ |
|
Instrument Inputs |
|
|---|---|
|
Frequency Response |
20Hz - 20kHz ± 0.05dB |
|
Dynamic Range (A-weighted) |
113dB |
|
THD+N |
-80dB |
|
Maximum Input Level (at minimum gain) |
12dBu |
|
Gain Range |
62dB |
|
Input Impedance |
1MΩ |
|
Line Outputs |
|
|---|---|
|
Frequency Response |
20Hz - 20kHz ± 0.02dB |
|
Dynamic Range (A-weighted) |
122dB |
|
THD+N |
-112dB |
|
Maximum Output Level |
+16dBu |
|
Output impedance |
200Ω |
|
Headphone Outputs |
|
|---|---|
|
Frequency Response |
20Hz - 20kHz ± 0.1dB @ 33Ω / 300Ω |
|
Dynamic Range (A-weighted) |
112dB @ 33Ω 116dB @ 300Ω |
|
THD+N |
-100dB @ 33Ω (Minimum) -110dB @ 300Ω (Minimum) |
|
Maximum Output Level |
5dBu into 33Ω 11dBu into 300Ω |
|
Maximum Output Power |
57mW into 33Ω 27mW into 300Ω |
|
Output impedance |
11Ω |
|
Analogue Inputs |
|
|---|---|
|
Connectors |
Eight back panel Neutrik® Combo XLR/6.35mm (1/4") TRS jack inputs Two front panel 6.35mm (1/4") jack inputs |
|
Mic/Line switching |
Automatic |
|
Phantom Power (48v) |
Front panel 48V (phantom power) button or switch in software |
|
Line/Instrument switching |
Front panel Inst button or switch in software |
|
Auto Gain |
Front panel Auto button or switch in software |
|
Clip Safe |
Front panel Safe button. |
|
AIR function |
Front panel Air button or switch in software |
|
Analogue Outputs |
|
|---|---|
|
Balanced Outputs |
Ten 6.35mm (1/4") balanced jack outputs:
|
|
Headphone Outputs |
Two front panel stereo 6.35mm (1.4") TRS jack sockets |
|
Main Output Level Control |
Digitally controlled encoder |
|
Headphones Level Control |
Front panel analogue control |
|
Other I/O |
|
|---|---|
|
USB |
USB-C connector. |
|
ADAT |
Eight channels at 44.1/48kHz Eight channels at 88.2/96kHz Disabled at 176.4/192kHz |
|
S/PDIF |
Two channels of coaxial S/PDIF. Up to 96kHz. |
|
Word Clock |
One BNC connector Output |
|
Front Panel Indicators |
|
|---|---|
|
Channel Selection |
White/Green LEDs for channels 1 and 2 |
|
Select button |
White/Green Select LED |
|
48V |
White/Green 48V LED (depending on the selected channel) |
|
Inst |
White/Green Inst LED (depending on the selected channel) |
|
Auto |
White Auto LED to initiate Auto Gain |
|
Clip Safe |
White/Green Safe LED (depending on the selected channel) |
|
Air Mode |
White, green, amber Air LED (depending on the selected channel and selected Air mode) |
|
Output Level Meter |
Three-colour LED ring around Output control. |
|
USB |
USB |
|
Environmental |
|
|---|---|
|
Operating Temperature |
40°C / 104°F Maximum ambient operating temperature |
|
DAW Input |
Input RCA S/PDIF and Optical S/PDIF |
Input Dual ADAT |
|---|---|---|
|
1 |
Mic/Line/Inst 1 |
Mic/Line/Inst 1 |
|
2 |
Mic/Line/Inst 2 |
Mic/Line/Inst 2 |
|
3 |
Mic/Line 3 |
Mic/Line 3 |
|
4 |
Mic/Line 4 |
Mic/Line 4 |
|
5 |
Mic/Line 5 |
Mic/Line 5 |
|
6 |
Mic/Line 6 |
Mic/Line 6 |
|
7 |
Mic/Line 7 |
Mic/Line 7 |
|
8 |
Mic/Line 8 |
Mic/Line 8 |
|
9 |
Loopback 1 |
Loopback 1 |
|
10 |
Loopback 2 |
Loopback 2 |
|
11 |
S/PDIF L Coaxial or optical, depending on the S/PDIF mode. |
ADAT 1 (Port 1) |
|
12 |
S/PDIF R Coaxial or optical, depending on the S/PDIF mode. |
ADAT 2 (Port 1) |
|
13 |
ADAT 1 (Port 1) |
ADAT 3 (Port 1) |
|
14 |
ADAT 2 (Port 1) |
ADAT 4 (Port 1) |
|
15 |
ADAT 3 (Port 1) |
ADAT 5 (Port 1) |
|
16 |
ADAT 4 (Port 1) |
ADAT 6 (Port 1) |
|
17 |
ADAT 5 (Port 1) |
ADAT 7 (Port 1) |
|
18 |
ADAT 6 (Port 1) |
ADAT 8 (Port 1) |
|
19 |
ADAT 7 (Port 1) |
ADAT 1 (Port 2) |
|
20 |
ADAT 8 (Port 1) |
ADAT 2 (Port 2) |
|
21 |
ADAT 3 (Port 2) |
|
|
22 |
ADAT 4 (Port 2) |
|
|
23 |
ADAT 5 (Port 2) |
|
|
24 |
ADAT 6 (Port 2) |
|
|
25 |
ADAT 7 (Port 2) |
|
|
26 |
ADAT 8 (Port 2) |
|
DAW Input |
Hardware Input |
|
|---|---|---|
|
ADAT mode: Single |
ADAT mode: Dual |
|
|
1 |
Mic/Line/Inst 1 |
Mic/Line/Inst 1 |
|
2 |
Mic/Line/Inst 2 |
Mic/Line/Inst 2 |
|
3 |
Mic/Line 3 |
Mic/Line 3 |
|
4 |
Mic/Line 4 |
Mic/Line 4 |
|
5 |
Mic/Line 5 |
Mic/Line 5 |
|
6 |
Mic/Line 6 |
Mic/Line 6 |
|
7 |
Mic/Line 7 |
Mic/Line 7 |
|
8 |
Mic/Line 8 |
Mic/Line 8 |
|
9 |
Loopback 1 |
Loopback 1 |
|
10 |
Loopback 2 |
Loopback 2 |
|
11 |
S/PDIF L Coaxial or optical, depending on the S/PDIF mode. |
ADAT 1 (Port 1) |
|
12 |
S/PDIF R Coaxial or optical, depending on the S/PDIF mode. |
ADAT 2 (Port 1) |
|
13 |
ADAT 1 (Port 1) |
ADAT 3 (Port 1) |
|
14 |
ADAT 2 (Port 1) |
ADAT 4 (Port 1) |
|
15 |
ADAT 3 (Port 1) |
ADAT 1 (Port 2) |
|
16 |
ADAT 4 (Port 1) |
ADAT 2 (Port 2) |
|
17 |
ADAT 3 (Port 2) |
|
|
18 |
ADAT 4 (Port 2) |
|
Some Windows applications, such as Zoom, Microsoft Teams, OBS Studio, or web browsers, do not support the ASIO driver type used by professional audio software. Instead, they rely on a different style of driver that accesses the channels exposed by Windows in the Sound Settings.
By default, when you connect a Focusrite interface to a Windows computer a single Playback device and a single Recording device appear in non-ASIO applications.
To avoid confusion, using the Focusrite driver, you can choose which channels Windows should show or hide to these apps. This won’t affect how the interface works in your DAW (like Ableton Live or Cubase), which uses the ASIO driver directly.
Note
The Focusrite driver is installed with Focusrite Control 2 which you can download at any time from:
To show the full channel set to non-ASIO applications on Windows:
-
Click the Focusrite Notifier icon in the Windows taskbar. This opens the show/hide window.
-
Choose the channels you want to show to non-ASIO apps.
For example if you want to use line inputs 3/4 into streaming software, tick Analogue 3 + 4.
-
Click OK.
-
Open your non-ASIO app, you can now see each pair of input channels.
This does not affect ASIO apps
ASIO-compatible software ( most DAWs like Logic Pro, Ableton Live, Cubase, FL Studio, etc.) uses its own driver and will still show all channels, even if they’re hidden in Windows Sound Settings.
This means you can hide channels from Zoom or OBS without affecting your DAW setup.