Zoom U-24 User manual

© 2016 ZOOM CORPORATION
Copying or reprinting this manual in part or in whole without permission is prohibited.
Operation Manual

2
Thank you for choosing the ZOOM Handy Audio Interface. To achieve the best results—and to protect your
investment—please read this manual carefully and retain it for future reference. Use this product only as directed.
2-in/4-out Audio Interface
The ZOOM is a high quality audio interface that supports audio recording and playback at resolutions up to 24-
bit/96 kHz.
Featuring an asynchronous transfer system, is not impacted by computer jitter, and reproduces audio with
complete accuracy.
can be used with computers running Windows and Mac OS X, as well as with an iPad.
High-Performance Mic Preamps
is equipped with high-performance mic preamps that are based on the same design as our H-Series Handy
Recorders.
+48V phantom power can be supplied to each input. INPUT 1 also supports Hi-Z input.
Designed with the DJ in Mind
The features 2 RCA outputs that make it easy to connect to DJ mixers or other devices. The balance between
computer playback signals 1-2 and 3-4 can be adjusted for the LINE OUT 2 and PHONES outputs.
For example, you can balance the PHONES output between click and MAIN OUT signals during a live performance. Or
you can balance between the cue and MAIN OUT signals during a DJ performance.
Plus, the PHONES jack delivers enough volume output for use in clubs and other small venues.
Contents
Introduction
Introduction ………………………………………… 2
Safety and Usage Precautions ………………… 3
Part Names ………………………………………… 4
Connecting with a Computer/iPad……………… 6
Recording …………………………………………… 11
Playback …………………………………………… 14
Connecting MIDI Devices ………………………… 18
Troubleshooting …………………………………… 19
Specications ……………………………………… 20
Signal Flow Diagrams …………………………… 21

3
Safety Precautions
In this operation manual, symbols are used to highlight
warnings and cautions that you must read to prevent
accidents.The meanings of these symbols are as follows.
Warning
Something that could cause serious injury or
death
Caution
Something that could cause injury or damage to
the equipment
Other symbols used
An action that is mandatory
An action that is prohibited
Warning
Warning
Alterations
Do not open the case or modify the product.
Operation using an AC adapter
Never use any AC adapter other than a ZOOM AD-17.
Always hold the AC adapter itself when disconnecting it from an outlet.
Operation with external DC power supply
Use a 5V external DC power supply.
Carefully study the warning indications of the external DC power supply
before use.
Operation using batteries
Use 2 ordinary 1.5-volt AA batteries (alkaline or nickel-metal hydride).
Read battery warning labels carefully.
Always close the battery compartment cover when using the unit.
Warning
Caution
Product handling
Do not drop, bump or appl y excessive force to the unit.
Be careful not to allow foreign objects or liquids to enter the unit.
Battery handling
Install the batteries with the correct +/−orientation.
Use a specied battery type.
Do not mix new and old batteries or different brands or types at the same
time.
When not using the unit for an extended period of time, remove the
batteries.
If a battery leak should occur, wipe the battery compartment and the
battery terminals carefully to remove all residue.
Operating environment
Do not use in extremely high or low temperatures.
Do not use near heaters, stoves and other heat sources.
Do not use in very high humidity or where it could be splashed by water.
Do not use in places with frequent vibrations.
Do not use in places with much dust or sand.
Connection cables and input/ output jacks
Always turn the power OFF for all equipment before connecting any cables.
Always disconnect all connection cables and the AC adapter before moving
the unit.
Volume
Do not use at a loud volume for a long time.
Usage Precautions
Interference with other electrical equipment
For safety considerations, is designed to minimize the emission
of electromagnetic waves and suppress interference from external
electromagnetic waves. However, interference could still occur if is
placed next to equipment that is very susceptible to interference of that
emits powerful electromagnetic waves. If this occurs, place the and
the other device farther apart.
With any type of digital control device—including the —
electromagnetic interference can cause malfunction, corrupt or destroy
data, or cause other unexpected issues. Always exercise caution.
Cleaning
Use a soft cloth to clean the exterior of the unit if it becomes dirty. If necessary,
use a damp cloth that has been wrung out well to wipe it.
Never use abrasive cleansers, wax or solvents such as alcohol, benzene or paint
thinner.
Temperature considerations
The may become warm after long periods of continuous use.This is
normal, as long as the unit does not become too hot to touch.
Breakdown and malfunction
If the malfunctions or operates abnormally, disconnect it
immediately. Contact the store where you purchased the unit, or
contact ZOOM customer service with the following information: product
model, serial number, and the specic symptoms of the breakdown or
malfunction—along with your name, address, and telephone number.
Copyrights
t Windows®is a registered trademark of Microsoft®Corporation.
t Mac®, iPad®and Lightning™ are trademarks or registered trademarks
of Apple Inc.
t MIDI is a registered trademark of Association of Musical Electronics
Industry (AMEI).
t Other product names, registered trademarks and company names in
this document are the property of their respective companies.
Note: All trademarks and registered trademarks in this document are for
identication purposes only and are not intended to infringe on the
copyrights of their respective owners.
Recording for any purpose other than personal use from copyrighted
sources, including CDs, records, tapes, live performances, video works
and broadcasts, without permission of the copyright holder is prohibited
by law.
ZOOM Corporation will not assume any responsibility related to
infringements of copyrights.
Safety and Usage Precautions
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to
which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
FCC regulation warning (for U.S.A.)
This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
Declaration of Conformity
For EU Countries

4
INPUT 2 jack
Level indicators
GAIN knobs
Power indicator
PHONES jack
BALANCE knob
PHONES knob
PHANTOM switch
MAIN OUT knob
MAIN OUT jacks LINE OUT 1 jacks
LINE OUT 2 jacks
DIRECT MONITOR knob
MUTE switches
Hi-Z switch
INPUT 1 jack
Top
XLR TRS
1: GND
2: HOT
3: COLD
TIP: HOT
RING: COLD
SLEEVE: GND
12
3
Part Names

5
POWER switch
DC 5V connectorMIDI IN jack
USB 2.0 portMIDI OUT jack
Left side
Back
Part Names (continued)

6
Do not connect the until installation completes.
Windows
1. Download the ZOOM U-24 Driver from http://www.zoom.co.jp/downloads/ to
your computer.
NOTE
t :PVDBOEPXOMPBEUIFMBUFTU;00.6ESJWFSGSPNUIFBCPWFXFCTJUF
t %PXOMPBEUIFESJWFSGPSUIFPQFSBUJOHTZTUFNUIBUZPVBSFVTJOH
2. Launch the installer and install the driver.
'PMMPXUIFJOTUSVDUJPOTUIBUBQQFBSPOTDSFFOUPJOTUBMMUIF;00.6ESJWFS
NOTE
t 4FFUIF*OTUBMMBUJPO(VJEFJODMVEFEJOUIFESJWFSQBDLBHFGPSEFUBJMFEJOTUBMMBUJPOQSPDFEVSFT
Mac
Driver installation is not necessary when using a Mac.
Installing the Driver

7
Using bus power
Use a USB cable to connect the to the computer.
<Back>
Using batteries
1. Open the battery cover on the bottom.
2. Install the batteries.
3. Replace the battery cover.
NOTE
t 6TFPOMZBMLBMJOFCBUUFSJFTPSSFDIBSHFBCMF/J.)CBUUFSJFT
t 5IFQPXFSJOEJDBUPSXJMMCMJOLXIFOUIFCBUUFSZDIBSHFCFDPNFTMPX5VSOUIFQPXFSPGGJNNFEJBUFMZBOEJOTUBMMOFX
batteries.
Using an external power supply
Connect either the optional AD-17 adapter, a commercially available USB power adapter, or
a mobile USB battery to the DC 5V connector.
<Back>
Choosing a Power Source

8
1. Minimize the volume of any output devices that are currently connected to the
.
2. Use a USB cable to connect the to the computer.
<Back>
3. Set to USB or BATTERY/DC IN to turn the power on.
NOTE
t 8IFOVTJOHCBUUFSJFTPSBOFYUFSOBMQPXFSTVQQMZTFU UP#"55&3:%$*/
4. Conrm that the power indicator is lit.
Connecting with a Computer

9
:PVDBODPOOFDUUIF to an iPad when using either the optional AD-17 power adapter,
an external DC power supply, or AA batteries.
1. Minimize the volume of any output devices that are currently connected to the
.
2. Install batteries or connect an external power supply. (→P. 7)
3. Connect the and the iPad using an Apple iPad Camera Connection Kit or
Lightning to USB Camera Adapter.
<Back>
4. Set to BATTERY/DC IN.
After the turns on, it will connect to the iPad.
NOTE
tcannot accept bus power from an iPad.
5. Conrm that the power indicator is lit.
<Left side>
iPad Connection

10
1. Minimize the volume of any output devices that are currently connected to the
.
2. Turn off amps, monitor speakers, and any other output equipment that is
currently connected to the .
3. Set to OFF.
5VSOJOHUIF1PXFS0GG

11
*OTUSVNFOUTDBOCFDPOOFDUFEUP*/1654VTJOH534PSNPOPJOTUSVNFOUDBCMFT
Bass guitar
(TRS cable)
(mono instrument cable)
Keyboard
Guitar
Using the Hi-Z Function
t5IF)J;GVODUJPODBOPOMZCFVTFEXJUI*/165
t8IFODPOOFDUJOHBHVJUBSPSCBTTXJUIQBTTJWFQJDLVQTVTF*/165
and turn on ( ).
t8IFODPOOFDUJOHBLFZCPBSEPSPUIFSJOTUSVNFOUDPOOFDUJUUP*/165
1 and turn off ( PSDPOOFDUJUUP*/165
Connecting Instruments

12
Using Phantom Power
tWhen using a condenser mic, turn on ( ).
t8IFOPOQIBOUPNQPXFSJTTVQQMJFEUPCPUI*/1654BOE
.JDTDBOCFDPOOFDUFEUP*/1654VTJOH9-3DBCMFT
Dynamic mic
Condenser mic
(XLR cable)
(XLR cable)
Connecting Mics

13
:PVDBOBEKVTUUIFHBJOPGFBDIJOQVU
1. Check the status of the input signal.
(SFFOMJHIU*OQVUTJHOBMJTQSFTFOU
3FEMJHIU*OQVUTJHOBMJTDMJQQJOH
2. Adjust the input gain.
5VSOUIF .
HINT
t 5PBWPJEEJTUPSUFEBVEJPBEKVTUUIFJOQVUHBJOTPUIFMFWFMJOEJDBUPSEPFTOhUMJHIUVQSFE
"EKVTUJOH*OQVU(BJO

14
$POOFDU IFBEQIPOFT UP UIF 1)0/&4 KBDL TQFBLFST UP UIF ."*/ 065 KBDLT BOE BEKVTU
the volume levels accordingly.
1. Connect headphones or speakers.
Speakers
Headphones
2. Adjust the headphones/speakers volume.
)FBEQIPOFTWPMVNF5VSO .
4QFBLFSTWPMVNF5VSO .
NOTE
t 5IF-*/&065KBDLTEFMJWFSUIFTBNFTJHOBMPVUQVUBTUIF."*/065KBDLT
t 5IF-*/&065KBDLTEFMJWFSUIFTBNFTJHOBMPVUQVUBTUIF1)0/&4KBDL
t 5IF-*/&065BOEWPMVNFMFWFMTDBOUCFDIBOHFE
t 5IF."*/065-*/&065KBDLTEFMJWFSPVUQVUGSPNDPNQVUFSQMBZCBDLTJHOBMT
t 5IF1)0/&4-*/&065KBDLTEFMJWFSPVUQVUGSPNUIFBEKVTUFECBMBODFPGDPNQVUFSQMBZCBDLTJHOBMTBOE→P. 17)
$POOFDUJOH)FBEQIPOFTBOE4QFBLFST

15
5IFPVUQVUTPGDIBOOFMT"."*/065-*/&065BOE#1)0/&4-*/&065DBOCF
muted/unmuted.
1. Press for the channel you want to mute.
-JU.VUFE
6OMJU/PUNVUFE
Muting Outputs

16
Direct monitoring enables you to listen to input signals before they pass through the
DPNQVUFS5IJTBMMPXTZPVUPIFBSUIFTPVOEDPNJOHJOUPUIF without latency.
1. Turn to adjust the balance between the
audio input and the computer playback
signals.
Using Direct Monitoring

17
5IFCBMBODFCFUXFFODPNQVUFSQMBZCBDLTJHOBMTBOEDBOCFBEKVTUFEGPSUIF-*/&
065BOE1)0/&4PVUQVUT
'PSFYBNQMFZPVDBOCBMBODFUIF1)0/&4PVUQVUCFUXFFODMJDLUSBDLBOE."*/065
TJHOBMT EVSJOH B MJWF QFSGPSNBODF 0S ZPV DBO CBMBODF CFUXFFO UIF DVF BOE ."*/ 065
signals during a DJ performance.
Live performance
Speakers
Headphones
DAW software
MAIN OUT
［1-2］30％
70％
Click track
［3-4］
DJ performance
Speakers
Headphones
DAW software
MAIN OUT
［1-2］50％
50％
Cue audio
［3-4］
1. Turn to adjust the balance between
computer playback signals 1-2 and 3-4.
NOTE
t $PNQVUFSQMBZCBDLTJHOBMTBSFPVUQVUGSPNUIF."*/065-*/&
065KBDLT
Adjusting the Computer Playback Signal Balance

18
6TF.*%*DBCMFTUPDPOOFDU.*%*EFWJDFTUPUIF.*%**/BOE.*%*065KBDLT
Sound module
MIDI OUT jack
MIDI OUT jack
MIDI IN jack
MIDI IN jack
MIDI keyboard or
MIDI controller
<Back>
NOTE
t 8IFOZPVDPOOFDUUIF to a DAW using a MIDI port, follow the instructions below to ensure proper connectivity
and functionality.
<Windows>
 6TF;00.6%SJWFS%POPUVTF.*%**/065;00.6%SJWFS
<Mac>
 6TF;00.6.*%**01PSU%POPUVTF;00.63FTFSWFE1PSU
Connecting MIDI Devices

19
Cannot select or use the device
tConfirm that the is connected to the
computer correctly.
tQuit all the software that is using the ,
and disconnect and reconnect the USB cable
connected to the .
tReinstall the driver.
tConnect the directly to a USB port on the
computer. Do not connect it to a USB hub.
Playback sound cannot be heard or is quiet
tCheck the speaker connections and volume
settings on the speakers.
t"EKVTUUIF065165BOE1)0/&4WPMVNF
controls.
tConrm that the Sound setting of the computer
UIBUZPVBSFVTJOHJTTFUUP;00.6
t"EKVTUUIF%*3&$5.0/*503LOPC
tIf no sound can be heard or the volume is low
GSPNUIF1)0/&4-*/&065PVUQVUTBEKVTU
UIF#"-"/$&LOPC
Recorded audio is too loud, too quiet or
silent
tAdjust the input gain of the .
tWhen using a condenser mic, turn phantom
power on.
tConfirm that the Sound setting of the
computer that you are using is set to "ZOOM
6
The sound of the device connected to the
input jack is distorted
tConrm that the level indicators are not lighting
red. If they are, lower the input levels.
Sound skips during playback or recording
tIf you can adjust the audio buffer size of the
software that you are using, increase the buffer
size.
t5VSOUIFBVUPNBUJDTMFFQGVODUJPOBOEPUIFS
computer power saving settings OFF.
tConnect the directly to a USB port on the
computer. Do not connect it to a USB hub.
Cannot play or record
tConrm that the Sound setting of the computer
UIBUZPVBSFVTJOHJTTFUUP;00.6
tConrm that is set for input and output in
the software you are using.
tConfirm that i s c o n n e c t e d t o t h e
computer correctly.
tQuit all software that is using the , then
disconnect and reconnect the T64#
cable.
Cannot use with an iPad
tConfirm that the batteries are loaded or the
external power supply is connected correctly.
(→P. 7)
t4FUUIF108&3TXJUDIUP#"55&3:%$*/UP
turn the power on.
5SPVCMFTIPPUJOH

20
ANALOG IN INPUT 1/2 Connector TRS/XLR combo jacks
(XLR: 2 hot,TRS:TIP hot)
Input gain 0 – 43 dB
Input impedance 2.6 kΩ(MIC IN)
1.1 MΩ(when Hi-Z ON)
Maximum input level +2.7 dBu (MIC IN)/+20.7 dBu (TRS IN)
Phantom power +48 V
ANALOG OUT MAIN OUT L/R Connector TRS phone jacks (unbalanced)
Maximum output level +10 dBu (at 0 dBFS)
Output impedance 330 Ω
LINE OUT 1/2 Connector RCA (coaxial)
Maximum output level +8 dBu (at 0 dBFS)
Output impedance 1 kΩ
PNONES Connector Standard stereo phone jack
30 mW x 2 (into 32 Ωload)
Maximum output level +10 dBu (at 0 dBFS)
Output impedance 33 Ω
Frequency characteristics At 44.1 kHz: -1.0 dB: 20 Hz - 20 kHz
At 96 kHz: -3.5 dB: 20 Hz - 40 kHz
Input conversion noise Measured EIN: -119.5 dB (IHF-A)
(with 43 dB, 150 Ωinput)
Number of audio recording and playback channels Recording: 2 channels
Playback: 4 channels
Sampling frequencies 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz
Bit depth 24 bit
Interface USB2.0
MIDI IN/OUT 5 pin DIN jack
Power Source USB bus power (Type B)/ZOOM AD-17 (Micro-B)/DC 5 V power supply
(Micro-B)/2 AA batteries (about 4 hours continuous operation with
phantom power off)
Power consumption 5 W maximum
Dimensions 191.8 mm (D) ×92.3 mm (W) ×42.7 mm (H)
Weight (main unit only) 285 g
* 0 dBu = 0.775 Vrms
/PUF5IFDPOUJOVPVTPQFSBUJPOUJNFXJUICBUUFSJFTJTKVTUBOFTUJNBUF5IJTSFTVMUJTGSPNJOIPVTFUFTUJOHNFUIPET5IFBDUVBMUJNFXJMMWBSZHSFBUMZ
according to operating conditions.
Specications