USB AUDIO CONVERTER
Operation Manual
You must read the Usage and Safety Precautions before use.
©2023 ZOOM CORPORATION
Copying or reprinting this manual in part or in whole without permission is prohibited.
Product names, registered trademarks and company names in this document are the property of their respective companies. All trademarks and
registered trademarks in this document are for identification purposes only and are not intended to infringe on the copyrights of their respective owners.
Proper display is not possible on grayscale devices.
Notes about this Operation Manual
You might need this manual in the future. Always keep it in a place where you can access it easily.
The contents of this document and the specifications of the product could be changed without notice.
• Microsoft and Windows are trademarks of the Microsoft corporate group.
• iPadOS, Lightning and Mac are trademarks of Apple Inc.
• App Store is a service mark of Apple Inc.
• IOS is a registered trademark or trademark of Cisco Systems, Inc. and its affiliated companies in the USA
and other countries, and it is used under license.
• USB Type-C is a trademark of the USB Implementers Forum.
• Other product names, registered trademarks and company names in this document are the property of
their respective companies.
• All trademarks and registered trademarks in this document are for identification purposes only and are
not intended to infringe on the copyrights of their respective owners.
• Recording from copyrighted sources, including CDs, records, tapes, live performances, video works
and broadcasts, without permission of the copyright holder for any purpose other than personal use is
prohibited by law. ZOOM CORPORATION will not assume any responsibility related to infringements of
copyrights.
2
Contents
Notes about this Operation Manual........................................................................................................................ 2
UAC-232 overview........................................................................................................................................................5
High-quality audio inputs........................................................................................................................................... 5
Functions of parts..................................................................................................................................................... 10
Connecting to computers........................................................................................................................................ 13
Preparing for use with a Mac computer............................................................................................................... 14
Preparing for use with a Windows computer...................................................................................................... 15
Connecting to iOS/iPadOS devices......................................................................................................................... 18
Using an external power supply.............................................................................................................................19
Connecting instruments and mics..........................................................................................................................20
Connecting instruments........................................................................................................................................... 21
Connecting mics.........................................................................................................................................................23
Using direct monitoring............................................................................................................................................25
Adjusting the volume................................................................................................................................................26
Adjusting the output volume.................................................................................................................................. 26
Adjusting the headphone volume.......................................................................................................................... 26
Using ZOOM UAC-232 Mix Control.........................................................................................................................27
Installing ZOOM UAC-232 Mix Control.................................................................................................................. 27
ZOOM UAC-232 Mix Control Screen...................................................................................................................... 28
Adjusting waveform display size.............................................................................................................................30
Overview of Music and Streaming modes............................................................................................................ 31
Adjusting direct monitoring..................................................................................................................................... 33
Adjusting the streaming mixer................................................................................................................................34
Enabling the loopback function.............................................................................................................................. 35
Restoring factory default settings.......................................................................................................................... 37
Managing the firmware............................................................................................................................................38
Checking the firmware version............................................................................................................................... 38
Updating the firmware............................................................................................................................................. 38
Use example: Making music....................................................................................................................................39
Use example: Web streaming using a computer.................................................................................................42
Use example: Web streaming using an iOS/iPadOS device................................................................................45
Using the included flat cable fasteners................................................................................................................. 48
Mixer diagram............................................................................................................................................................49
Terms used in this manual......................................................................................................................................50
Troubleshooting.........................................................................................................................................................51
Not recognized by computer when connected....................................................................................................51
Cannot select or use the UAC-232 device.............................................................................................................51
The sound of the device connected to the input jack is distorted, too quiet or silent...................................51
Cannot play or record.............................................................................................................................................. 52
Playback sound cannot be heard or is quiet........................................................................................................52
3
Cannot be used with an iOS/iPadOS device......................................................................................................... 52
Sound breaks up during playback or recording.................................................................................................. 52
Noise is loud during direct monitoring................................................................................................................. 52
Specifications..............................................................................................................................................................53
4
UAC-232 overview
High-quality audio inputs
Using original dual A/D converter circuits and 32-bit float recording technologies with a maximum sample
rate of 192 kHz, the UAC-232 can process input signals as super-high-resolution audio without any need for
gain adjustments.
Audio input with no need for gain adjustment
Dual A/D converter circuits enable recording sound ranging from quiet to loud without making gain
adjustments.
5
Editing in DAWs and other software
Since 32-bit Float WAV file format is used for recording, the recording audio quality is retained when
editing.
6
Dual A/D converter circuit overview
High-gain
AD converter
Low-gain
AD converter
AD converter
switches in
response to
input level
・Airplane
・Nearby thunder
・Train passing on tracks overhead
・Inside train
・Shouting
・Grand piano
・Noisy street
・Chimes
・Ordinary conversation
・Whispering
・Quiet library
・Late night in suburb
Wide dynamic range covered
by two AD converters
Input gain adjusted to
desired recording volume
Dual AD converters
Conventional equipment
The UAC-232 has two A/D converters with different input gains for each input circuit. This design enables
high-quality audio recording with a DAW, for example, without the need to adjust input gain settings, a step
that is normally indispensable.
Providing amazing dynamic range
By combining two A/D converters, a wide dynamic range not possible with a single A/D converter has been
realized.
7
Switching between two A/D converters
Low noise
because high-gain
AD converter selected
Low noise
because high-gain
AD converter selected
No clipping
because low-gain
AD converter selected
The UAC-232 constantly monitors data from the two A/D converters, and automatically selects the one that
provides the best recording results.
8
32-bit float WAV file overview
32-bit float WAV files have the following advantages over conventional 16/24-bit linear WAV files.
These features enable the quality of the sound during recording to be maintained when editing in DAWs
and other software.
Resolution advantage
32-bit float WAV files have the advantage of being able to maintain high resolution even at low volumes. As
a result, quiet sounds can be made louder when editing after recording without degrading their quality.
■ 16/24-bit linear WAV
Resolution is low
Volume raised
■ 32-bit float WAV
Resolution is high
Volume raised
Clipping advantage
If a waveform sounds clipped when output from the UAC-232 or in a DAW, it can be edited after recording
to lower its volume and restore an unclipped waveform because the data in the 32-bit float WAV file itself is
not clipped.
■ 16/24-bit linear WAV
Clipped recording
Still clipped
Volume lowered
■ 32-bit float WAV
Clipped recording
Not clipped
Volume lowered
9
Functions of parts
XLR
12
3
Front
Input jacks 1–2
❶
These input jacks have built-in mic preamps. Connect mics, keyboards, guitars and other audio sources
to them. These can be used with both XLR and standard phone (balanced or unbalanced) plugs. Please
use XLR plugs to connect mics and phone plugs to connect keyboards and guitars, for example. (→
Connecting instruments and mics)
1: GND
2: HOT
3: COLD
PHANTOM POWER switches
❷
These turn +48V phantom power on/off. Set this to ON when connecting condenser mics.
GUITAR/BASS switch
❸
Use this to enable Hi-Z support for the Input jack 1 circuit. Turn this on as necessary for the connected
guitar or bass.
SIGNAL indicators
❹
These light when signals are being input.
Headphone jack
❺
This outputs a stereo signal. Connect headphones here.
Headphone knob
❻
Use this to adjust the headphone volume. (→ Adjusting the headphone volume)
Power indicator
❼
This lights when the power is on.
OUTPUT knob
❽
Use this to adjust the volume of the signals output from the OUTPUT jacks. (→ Adjusting the output
volume)
10
DIRECT MONITOR switch
❾
Turn this on to directly monitor sounds from the input jacks before they pass through the computer.
(→ Using direct monitoring)
32-BIT FLOAT indicator
❿
This lights when the UAC-232 is operating in 32-bit float mode.
11
Back
DC 5V port (Type-C)
❶
Use this power supply USB port to connect an AC adapter or portable battery. (→ Using an external
power supply)
USB port (Type-C)
❷
Use this USB port to connect with a computer or iOS/iPadOS device. (→ Connecting to computers,
Connecting to iOS/iPadOS devices)
MIDI jacks
❸
Use these to connect external MIDI equipment.
• OUT connector: Connect the MIDI IN connector of an external MIDI device here.
• IN connector: Connect the MIDI OUT connector of an external MIDI device here.
OUTPUT jacks
❹
These output the left (L) and right (R) channels of a stereo signal. Connect these to speakers with builtin amplifiers, for example.
12
Connecting to computers
USB Type-C
The UAC-232 is compatible with USB bus power, so power can be supplied to it from a computer through a
USB cable.
1. Install the dedicated driver before using a UAC-232 to record for the first time with a DAW application
on a Windows computer. (→ Installing the driver)
NOTE:
A driver is not necessary when using a Mac.
2. If speakers, headphones or other output devices are connected to the UAC-232, minimize their
volumes. (→ Adjusting the volume)
3. Use a USB cable to connect the UAC-232 USB port (Type-C) to a USB port on the computer.
NOTE:
Use a USB cable that supports data transfer.
4. Confirm that the power indicator is lit.
13
Preparing for use with a Mac computer
A driver is not necessary when using a Mac.
The following settings must be made to use the UAC-232 at 32-bit float with a Mac.
1. Open the Audio MIDI Setup app, which is in the Utilities subfolder of the Applications folder on the
Mac.
2. Select ZOOM UAC-232 in the Audio Devices, and set the input and output formats to 32-bit float.
14
Preparing for use with a Windows computer
Installing the driver
The dedicated driver must be installed on a Windows computer before using a DAW app on it to record.
1. Download the ZOOM UAC-232 Driver from zoomcorp.com to the computer.
NOTE:
The latest ZOOM UAC-232 Driver can be downloaded from the above website.
2. Launch the installer and follow the instructions to install the ZOOM UAC-232 Driver.
NOTE:
• Do not connect the UAC-232 to the computer during installation.
• See the Installation Guide included in the driver package for detailed installation procedures.
15
Making driver control panel settings
1. Click the “ZOOM UAC-232 Control Panel” icon in the taskbar notification area to open the Control
Panel.
2. Make control panel settings.
Buffer size setting
❶
This sets the size of the buffer used by the driver. Raising the value makes operation more stable but
also increases latency.
Sample rate setting
❷
This sets the sampling frequency used by the UAC-232. If this is also set in the DAW or other
application, that setting might be given priority.
Transmission format setting
❸
This sets the format of data sent and received by the UAC-232.
16
This should normally be left set to “32-bit Float”. Try “24-bit”, though, if this setting does not work
properly with an application.
Open an information dialog
❹
Use this to check the version, for example.
Close the control panel
❺
Use this to close the control panel.
17
Connecting to iOS/iPadOS devices
USB Type-C
An external power supply must be used during use with an iOS/iPadOS device.
1. If speakers, headphones or other output devices are connected to the UAC-232, minimize their
volumes. (→ Adjusting the volume)
2. Connect an external power supply. (→ Using an external power supply)
NOTE:
Power must be provided before connecting an iOS/iPadOS device to the UAC-232.
3. Use a USB cable to connect the UAC-232 USB port (Type-C) to the iOS/iPadOS device.
When connecting an iOS/iPadOS device, prepare USB cables and adapters that match its connectors
as necessary.
Use a USB cable that supports data transfer.
Connector type Necessary USB cable/adapter
Lightning connector
Type-C connector USB Type-C to Type-C cable
USB Type-A to Type-C cable, Lightning to USB 3 Camera
Adapter
18
Using an external power supply
A dedicated AC adapter (ZOOM AD-17) or a commercially-available USB portable battery can be used.
1. Connect the USB connector of the dedicated AC adapter to the DC 5V port (Type-C), and plug the AC
adapter into an outlet.
HINT:
To use a USB portable battery, connect its USB cable to the DC 5V port (Type-C).
2. Confirm that the power indicator is lit.
19
Connecting instruments and mics
Always set and to their minimum values and turn off before connecting instruments
and mics.
The UAC-232 adjusts the gain (amplification) of input signals according to their sources to raise them to
levels that are easy to work with. The default gain amounts are as follows.
Input source Gain
Dynamic mic (phantom power off) +45 dB
Condenser mic (phantom power on) +27 dB
Line (GUITAR/BASS off) +24 dB
Guitar/bass (GUITAR/BASS on) +18 dB
NOTE:
• Gain settings can be changed by using ZOOM UAC-232 Mix Control. (→ Using ZOOM UAC-232 Mix
Control)
• With 32-bit float recording, recording quality will not be degraded by gain settings.
20
Connecting instruments
1. Connect an instrument to the UAC-232.
• Use an instrument cable to connect a guitar or bass, for example, to the Input 1 jack.
• Use instrument or TRS cables to connect a keyboard or mixer, for example, to the Input 1–2 jacks.
21
2. When connecting a guitar or bass guitar, press so that it lights.
status
Use this setting when connecting a guitar or bass.
On (lit)
High-impedance (Hi-Z) input is supported when is lit.
Off (unlit) Use this setting when connecting a mic or keyboard, for example.
NOTE:
• Please use phone plugs when connecting line-level instruments, for example.
• Phantom power (48 V) is only supplied to the XLR connectors.
Explanation
22
Connecting mics
1. Use mic cables to connect dynamic and condenser mics to the Input 1 and 2 jacks.
2. When connecting a mic to the Input 1 jack, if is lit, press to make it unlit.
3. Press so that they light when connecting condenser mics.
status
On (lit) Use this to supply phantom power to condenser mics.
Off (unlit) Use this when connecting dynamic mics.
Explanation
23
NOTE:
• Please use XLR plugs when connecting mics.
• Do not turn on when connecting equipment that is not compatible with phantom power. Doing
so could damage the equipment.
24
Using direct monitoring
When direct monitoring is turned on, sound input to the UAC-232 can be directly monitored using
headphones, for example, before it passes through the computer. This enables monitoring without latency.
1. Press so that it lights.
HINT:
The direct monitoring mix levels can be adjusted using ZOOM UAC-232 Mix Control. (→ Using ZOOM
UAC-232 Mix Control)
25
Adjusting the volume
The volume output from speakers and headphones connected to the UAC-232 can be adjusted.
The connected jacks have different knobs to adjust their volumes.
NOTE:
Minimize the UAC-232 volume before connecting speakers or headphones. Failure to do so could result in
unexpected loud sounds, causing harm to hearing, for example.
Adjusting the output volume
Turn to adjust the volume for the OUTPUT jacks on the back of the unit.
Adjusting the headphone volume
Turn to adjust the volume for the headphone jack on the front of the unit.
26
Using ZOOM UAC-232 Mix Control
ZOOM UAC-232 Mix Control is an application designed to control the internal mixer settings of the
UAC-232, including levels for direct monitoring and the streaming mixer.
Installing ZOOM UAC-232 Mix Control
Windows/Mac computers
1. Download ZOOM UAC-232 Mix Control from the ZOOM website (zoomcorp.com).
2. Follow the instructions and install ZOOM UAC-232 Mix Control.
HINT:
• The latest version of ZOOM UAC-232 Mix Control can be downloaded from the above website.
• Download the version of ZOOM UAC-232 Mix Control for the operating system being used.
iOS/iPadOS devices
1. Open the App Store on the iOS/iPadOS device and search for “UAC-232 Mix Control”.
2. Tap “GET” on the UAC-232 Mix Control screen.
This will install UAC-232 Mix Control.
NOTE:
If a DAW or another app that uses MIDI ports is already running, the MIDI ports for ZOOM UAC-232 Mix
Control will be used and proper connection might not be possible.
Either launch ZOOM UAC-232 Mix Control before the other application or change the settings of that
application so that it does not use MIDIIN2/MIDIOUT2 (ZOOM UAC-232 MIDI).
27
ZOOM UAC-232 Mix Control Screen
Input level sliders
❶
Use these to adjust the input signal gain for each channel. (→ Adjusting waveform display size)
Input signal levels
❷
These show the input signal levels of each channel. (→ Adjusting waveform display size)
Input signal waveforms
❸
These show the input signal waveforms of each channel. (→ Adjusting waveform display size)
LEVEL knobs
❹
• Music mode: Use these to adjust the direct monitoring volume of each channel. (→ Adjusting direct
monitoring)
• Streaming mode: Use these to adjust the streaming mixer volume of each channel. (→ Adjusting the
streaming mixer)
PAN knobs
❺
• Music mode: Use these to adjust the stereo positions of each channel for direct monitoring. (→
Adjusting direct monitoring)
• Streaming mode: Use these to adjust the stereo positions of each channel for the streaming mixer.
(→ Adjusting the streaming mixer)
Level meters
❻
• Music mode: These show the direct monitoring levels. (→ Adjusting direct monitoring)
• Streaming mode: These show the streaming mixer levels. (→ Adjusting the streaming mixer)
Music/Streaming switch
❼
Use this to switch between Music and Streaming modes according to the application. (→ Overview of
Music and Streaming modes)
28
Loopback switch
❽
This turns the loopback function on/off. (→ Enabling the loopback function)
29
Adjusting waveform display size
1. Adjust the waveform display size.
Use the input level slider for the desired channel to adjust its waveform display size so that the input
signal waveform is easy to view.
HINT:
• The sizes of the recording waveforms shown in DAW applications will be about the same size as those
shown here.
• Using the input level sliders will change the amplification of the input signals, but this will not degrade
recording quality.
NOTE:
• When using a DAW app that does not support 32-bit float recording, input exceeding a certain level could
cause distortion. If this occurs, the waveform size can be reduced to avoid this.
• A list of applications that have been checked for compatibility with 32-bit float recording is available on
the ZOOM website (zoomcorp.com).
30
Overview of Music and Streaming modes
INPUT1
INPUT2
OUTPUT
INPUT1
DAW
INPUT2
OUTPUT 1/2
UAC-232
Set this according to the use of the USB audio signal path.
Music mode
The Music mode setting is good for making music with a DAW, for example.
Set to Music in ZOOM UAC-232 Mix Control. (Music mode is enabled when the unit is first used
after purchase or initialization.)
This mode is useful for recording a guitar and vocals simultaneously to separate tracks, for example. Input
sounds are handled as separate signals by the computer or iOS/iPadOS device in the same way as with an
ordinary audio interface.
In this mode, and can be used to adjust the direct monitoring mix. (→ Adjusting direct
monitoring)
→ Use example: Making music
31
Streaming mode
Web
INPUT1
INPUT2
OUTPUT
INPUT1
INPUT2
OUTPUT 1/2
R
L
UAC-232
The Streaming mode setting is good for web streaming.
Set to Streaming in ZOOM UAC-232 Mix Control.
This mode is useful for streaming solo performances of vocals accompanied by guitar, for example. Input
sounds can be mixed like using an audio mixer and then sent to the computer or iOS/iPadOS device.
In this mode, and can be used to adjust the streaming mixer levels. (→ Adjusting the
streaming mixer)
→ Use example: Web streaming using a computer
→ Use example: Web streaming using an iOS/iPadOS device
32
Adjusting direct monitoring
1. Enable Music mode.
Press to enable Music mode.
2. Adjust direct monitoring levels.
Turn to adjust the levels of each channel.
If levels are raised too high using , the output sound could be clipped. Adjust them so that the
level indicators do not light red.
3. Set stereo positions for direct monitoring.
Turn to adjust the stereo positions of each channel.
33
Adjusting the streaming mixer
1. Enable Streaming mode.
Press to enable Streaming mode.
2. Adjust streaming mixer levels.
Turn to adjust the levels of each channel.
If levels are raised too high using , the streamed sound could be clipped. Adjust them so that
the level indicators do not light red.
3. Set stereo positions for the streaming mixer.
Turn to adjust the stereo positions of each channel.
HINT:
When in Streaming mode, turn on to enable monitoring the mix levels of the streaming mixer.
34
Enabling the loopback function
BGM
ON AIR
Web
LOOPBACKLOOPBACK
By turning on the Loopback function, sound input through the UAC-232 Input 1–2 jacks and sound output
from the computer can be mixed and then input to the computer again (looped back).
This is convenient for mixing background music played on the computer with sound input through the
UAC-232 and streaming it live, for example.
Mic and instrument sounds are input to the UAC-232.
❶
BGM from the computer is input to the UAC-232.
❷
Mic and instrument sounds and the BGM from the computer are mixed and output to the computer.
❸
1. Enable in ZOOM UAC-232 Mix Control.
35
NOTE:
When the UAC-232 loopback function is enabled, disable monitoring of the UAC-232 in the DAW or
streaming application.
If enabled, a feedback loop could be generated, which might cause loud noise to be output.
36
Restoring factory default settings
Execute
Cancel
This will restore the settings of the UAC-232 switches and internal mixer to their factory default values.
1. While pressing for Input jack 1, connect a USB cable to power the unit.
2. Initialize the settings.
Press for Input jack 1.
Execute
for Input jack 1 will blink and initialization will start.
Cancel Press , or for Input jack 2.
37
Managing the firmware
Checking the firmware version
The firmware version used by the UAC-232 can be checked. The ZOOM UAC-232 Mix Control application is
necessary to check the firmware version. (→ Using ZOOM UAC-232 Mix Control)
Updating the firmware
The UAC-232 firmware can be updated to the latest version. Files for the latest firmware updates can be
downloaded from the ZOOM website (zoomcorp.com).
Follow the instructions in the “UAC-232 Firmware Update Guide” on the UAC-232 download page.
38
Use example: Making music
DAW
INPUT1
INPUT2
To make music using a DAW app to record guitar and vocals at the same time, for example, use the
UAC-232 in Music mode. (Music mode is enabled when the unit is first used after purchase or initialization.)
The audio from the guitar and vocals can be recorded to separate tracks.
1. Set to Music mode in ZOOM UAC-232 Mix Control. (→ Music mode)
39
INPUT1
INPUT2
OUTPUT
INPUT1
DAW
INPUT2
OUTPUT 1/2
UAC-232
2. Supply power if using an iOS/iPadOS device. (→ Using an external power supply)
USB Type-C
USB Type-C
NOTE:
Power must be provided before connecting an iOS/iPadOS device to the UAC-232.
3. Connect the UAC-232 and the computer or iOS/iPadOS device. (→ Connecting to computers,
Connecting to iOS/iPadOS devices)
4. Connect the mic and instrument and set the switches. (→ Connecting instruments, Connecting mics)
40
5. Turn and to adjust the output volume. (→ Adjusting the volume)
6. Launch the DAW app on the computer or iOS/iPadOS device and select the UAC-232 as the audio
device.
7. Create a 32-bit float project and start recording.
NOTE:
Refer to the DAW app manual for how to use it.
41
Use example: Web streaming using a
BGM
ON AIR
Web
computer
When connecting with a computer for web streaming, set the UAC-232 to Streaming mode. Using the
ZOOM UAC-232 Mix Control app is necessary to switch the UAC-232 to Streaming mode. (→ Using ZOOM
UAC-232 Mix Control)
1. Set to Streaming mode in ZOOM UAC-232 Mix Control. (→ Streaming mode)
42
Web
INPUT1
INPUT2
OUTPUT
INPUT1
INPUT2
OUTPUT 1/2
R
L
UAC-232
2. Connect the UAC-232 and the computer. (→ Connecting to computers)
USB Type-C
3. Connect the mic and instrument and set the switches. (→ Connecting instruments, Connecting mics)
43
4. Select the UAC-232 as the computer input and output device.
5. To enable the loopback function for sound from the computer, press the switch in ZOOM
UAC-232 Mix Control to light it. (→ Enabling the loopback function)
6. Turn and to adjust the output volume. (→ Adjusting the volume)
7. Launch the streaming app on the computer, and select the UAC-232 as the “audio” or “input/output”
device.
8. Start streaming.
NOTE:
• Use BGM with permission from its creators.
• Refer to the streaming app manual for how to use it.
44
Use example: Web streaming using an iOS/
BGM
ON AIR
Web
BGM
ON AIR
iPadOS device
When using an iOS/iPadOS device for web streaming, switch the UAC-232 to Streaming mode.
1. Set to Streaming mode in ZOOM UAC-232 Mix Control. (→ Streaming mode)
45
Web
INPUT1
INPUT2
OUTPUT
INPUT1
INPUT2
OUTPUT 1/2
R
L
UAC-232
2. Supply power. (→ Using an external power supply)
USB Type-C
NOTE:
Power must be provided before connecting an iOS/iPadOS device to the UAC-232.
3. Connect the UAC-232 and the iOS/iPadOS device. (→Connecting to iOS/iPadOS devices)
4. Connect the mic and instrument and set the switches. (→ Connecting instruments, Connecting mics)
46
5. Turn and to adjust the output volume. (→ Adjusting the volume)
6. Launch the streaming app on the iOS/iPadOS device and start streaming.
NOTE:
Refer to the streaming app manual for how to use it.
47
Using the included flat cable fasteners
The included flat cable fasteners are useful for attaching cables to the handles on the sides, for example.
In addition, they can be used to hold the interface in place or to attach it to a mic stand.
48
Mixer diagram
49
Terms used in this manual
USB audio interface
This is equipment that can input sound from mics and instruments, for example, to a computer or iOS/
iPadOS device and output sound from that device to speakers and headphones.
Dynamic mic
These mics do not require phantom power and are tough and durable.
Condenser mic
These mics usually have high sensitivity and can capture sound with high quality. These require phantom
power supply for use.
Phantom power (48 V)
This is a function that supplies power to devices that require an external power supply, including some
condenser mics.
+48 V is standard.
50
Troubleshooting
Not recognized by computer when connected
• Use a USB cable that supports data transfer.
• Confirm that the USB cable is connected to the standard USB port on the UAC-232 and not to the DC 5V
port.
Cannot select or use the UAC-232 device
• Confirm that the UAC-232 has been connected correctly to the computer. (→ Connecting to computers)
• Quit all software that is using the UAC-232. Then, disconnect and reconnect the USB cable connected to
the UAC-232.
• If using a USB hub, stop using it. Connect the UAC-232 directly to a USB port on the computer.
• When connecting to a Windows computer, installing the dedicated driver could resolve problems with
applications other than DAWs. (→ Installing the driver)
• Reinstall the dedicated driver.
The sound of the device connected to the input jack is distorted, too quiet or silent
• When using a condenser mic, turn on .
• Use or to adjust the volume.
• Use ZOOM UAC-232 Mix Control to adjust the waveform display size.
• If the level meters in ZOOM UAC-232 Mix Control lights red, use to make adjustments.
51
Cannot play or record
• Confirm that “ZOOM UAC-232” is selected in the “Sound” settings of the computer being used.
• Confirm that UAC-232 is set for input and output in the software being used.
• Quit all software that is using the UAC-232. Then, disconnect and reconnect the USB cable connected to
the UAC-232.
Playback sound cannot be heard or is quiet
• Check the connections and volume settings of the speakers.
• Use or to adjust the volume.
Cannot be used with an iOS/iPadOS device
• Confirm that the external power supply is connected correctly. (→ Using an external power supply)
Sound breaks up during playback or recording
• If the audio buffer size of the software being used can be adjusted, increase it.
• Turn off the automatic sleep function and other computer power saving settings.
• If using a USB hub, stop using it. Connect the UAC-232 directly to a USB port on the computer.
• We provide methods to optimize Windows computer settings for music production on our website
(zoomcorp.com). Try using the settings provided there.
Noise is loud during direct monitoring
• Use to minimize channels that do not have connected inputs.
52
Specifications
Input and output channels
Connectors
Number of input
channels
Number of output
channels
Inputs 1-2
Outputs
Mono (MIC/LINE) 2
Stereo (TRS) 1
Stereo (headphone) 1
Type XLR/TRS combo jack
(XLR: 2 HOT/TRS: TIP HOT)
Input impedance XLR: 2.7 kΩ
TRS: 4 kΩ/1 MΩ (when Hi-Z on)
Maximum input level XLR: +6 dBu
TRS: +24 dBu / +11.5 dBu (when HiZ on)
Phantom power +48 V
Type TRS phone jacks (balanced)
Maximum output
level
Output impedance 100 Ω
+18 dBu (at 0 dBFS)
Frequency response
Headphones
MIDI IN/OUT (5-pin DIN connectors)
USB USB Type-C (audio interface
DC 5V USB Type-C (for power supply)
Inputs 44.1 kHz: 20 Hz – 20 kHz, +0.1 dB /
Outputs 44.1 kHz: 20 Hz – 20 kHz, +0.0 dB /
Type Standard stereo phone jack
100 mW + 100 mW (32 Ω load)
Output impedance 12 Ω
function)
• Use a USB cable that supports
data transfer. USB bus power is
supported.
−0.2 dB
192 kHz: 20 Hz – 80 kHz, +0.1 dB /
−0.2 dB
−0.1 dB
192 kHz: 20 Hz – 80 kHz, +0.0 dB /
−1.0 dB
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Headphones 44.1 kHz: 20 Hz – 20 kHz, +0.0 dB /
−0.5 dB
192 kHz: 20 Hz – 80 kHz, +0.0 dB /
−1.0 dB
Equivalent input noise –127 dBu or less (IHF-A)
Audio interface
Power AC adapter (ZOOM AD-17): DC 5 V/1
Rated current USB / AC adapter (5 V): 293 mA
Power consumption 5 W maximum
Dimensions 164 mm (W) × 105.5 mm (D) × 65
Weight (unit only) 355 g
Input and output
channels
Sampling frequencies 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz,
Bit depth 32-bit float / 24-bit
Interface USB 2.0
Class USB Audio Class 2.0
Recording: 2 channels
Playback: 2 channels
176.4 kHz, 192 kHz
A
• USB bus power is supported.
mm (H)
Note: 0 dBu = 0.775 Vrms
54
ZOOM CORPORATION
4-4-3 Kanda-surugadai, Chiyoda-ku, Tokyo 101-0062 Japan
zoomcorp.com
Z2I-4794-01
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