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Zoom F4 Configuration

Introduction

This page describes the detailed configuration of a Zoom F4 recorder/interface for use with IRIS.

State

A Zoom F4 can save its state using a settings file on an internal SD card. While it will remember the last used settings, we recommend you restore the F4's state from the settings file each time you use it with IRIS to ensure the unit is configured correctly.

Firmware

Please ensure the Zoom F4 is running firmware F4 System Version 3.0 to enable the AIF with Rec mode and the ability to save/restore settings from a file. The firmware update and instructions may be downloaded from the Zoom Website.

Configuration

USB Menu

Before changing any other settings, the USB mode must be set to AIF with Rec.

Note

AIF with Rec mode will fix the sample rate to 48 kHz. IRIS will also need to be configured to use 48 kHz in Audio Settings otherwise you'll encounter an error when attempting to record an impulse response.

Input Menu

  1. Set Ambisonic Mode to Ambisonics A and Mic Position to Upright.

  2. HPF is Off on all channels.

  3. Input Limited is Off on all channels.

  4. Phantom Power is On for all inputs (1-4), and set to +48V. Power Saving should be Off.

  5. Plugin Power is Off.

Only settings which can be changed were listed here. The other input settings are disabled once Ambisonic Mode is activated.

Output Menu

  1. Routing -> Headphone Routing: Configure this to monitor the four microphone inputs (labelled 1-4). Channels 1 and 3 are assigned to headphone L, with 2 and 4 to R. If mono monitoring is preferred, enable MONO MIX.

    Zoom F4 headphone routing

  2. Routing -> MAIN OUT Routing: Assign U3 to M1. Nothing should be assigned to M2. This assigns USB send channel 3 to MAIN OUT 1 (the output to the loudspeaker).

    Zoom F4 main out routing

  3. Routing -> SUB OUT Routing: Assign U4 to S1. Nothing should be assigned to S2. This assigns USB send channel 4 to SUB OUT 1 (the loopback output).

    Zoom F4 sub out routing

  4. On/Off: All outputs set to On.

  5. Level: SUB OUT 1/2 set to Normal(-10dBV).

  6. Output Delay: All outputs set to 0 frames.

  7. Output Limited: Off on all channels.

Note

USB sends 1 and 2 are intentionally unused to reduce the chance of other sounds from Windows being played back through the excitation channel. (By default Windows will select the first two channels of any audio playback device).

Main Screen

Exit the menu to the main screen.

  1. Press the PFL button for input 1, and set the TRIM to +40dB. This will also set the gain to +40dB on the other microphone inputs if Ambisonics A mode was enabled earlier.

  2. Back on the main screen, press any of the buttons labelled 1 to 4 to record-enable these channels. Even though we are not using the device as a standalone recorder, this is necessary to send the microphone inputs over USB.

  3. Press and hold the button INPUT 5/6 to record-enable the loopback input.

Red LED indicators will show that the input channels have been record-enabled successfully.

Tip

On the main screen, assign the four circular knobs to FADER instead of TRIM, so that it's difficult to adjust the microphone gain by mistake.

Save Configuration to Settings File

To save the state of a Zoom F4 as a settings file:

  1. Navigate to MENU -> SYSTEM -> Backup/Load Settings

  2. Select SD card you wish to save the settings file to.

  3. Select Backup.

  4. Type a name for the settings file then select Enter.