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SL424USB Studio/Live Mixer
OPERATING MANUAL AND USER GUIDE
www.wharfedalepro.com
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OPERATING MANUAL AND USER GUIDE
IMPORTANT WARNINGS & SAFETY INSTRUCTIONS
1. Read these instructions
2. Follow all instructions
3. Keep these instructions
4. Heed all warnings
5. Do not use this apparatus near water
6. Clean only with dry cloth.
7. Do not block an y ventilation openings. Install in a cc or da nc e with the manufacturer ’s
instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatus (including ampliers) that produce heat.
9. Do not defeat the safety purpose of a polarised or grounding plug. A polarised plug has two
blades with one wider than the other. A grounding plug has two blades and a third grounding
blade. The wide blade or the third blade is provided for your safety. If the provided plug does
not t into your outlet, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched, particularly at the plug, receptacle and
or the point where it exits from the apparatus.
11. Only use attachments/accessories specied by the manufacturer.
12. Only use a stand, tripod, bracket or rack specified by the manufacturer, or sold with the
apparatus. When a rack is used, use caution when moving the rack and apparatus combination
to avoid tip-over or injury.
13. Unplug the apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualied personnel. Servicing is required when the apparatus has been
damaged in any way including but not limited to power supply cord or plug damage, liquid
ingress, foreign objects in the chassis, exposure to rain/moisture or impact damage. In addition
the unit must be serviced when you experience any abnormal operation.
15. CAUTION: These servicing instructions are for use by qualified service personnel only. To
reduce the risk of electric shock, do not attempt to perform any servicing other than that
contained in the operating instructions unless you are qualied to do so. In addition opening the
casing will result in your warranty becoming null and void.
16. Do not install this apparatus in a conned space such as a book case or similar unit. Good
ventilation should be maintained around the apparatus. Any vents, air-inlets or fans should not
be obstructed by objects such as paper, table-cloths, curtains etc.
17. WARNING: To reduce the risk of re or electric shock, do not expose the apparatus to rain or
moisture. The apparatus should not be exposed to dripping or splashing and objects lled with
liquids, such as vases, should not be placed on the apparatus.
18. WARNING: The mains plug/appliance coupler is used as a disconnect device, the disconnect
device shall remain readily operable.
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SL424USB
19. The lightning ash with arrowhead symbol within an equilateral triangle is intended to alert the
user to the presence of non-insulated “dangerous voltage” within the product’s enclosure that
may be of sufcient magnitude to constitute a risk of electric shock.
- Warning: To reduce the risk of electric shock, do not remove the cover (or back) as there are
no user-serviceable parts inside. Refer servicing to qualied personnel.
- The exclamation point within an equilateral triangle is intended to alert the user to the
presence of important operating and maintenance instructions in the literature accompanying
the appliance.
20. (Protective earthing terminal) The apparatus should be connected to a mains socket outlet
with a protective earthing connection.
ATTENTION: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR
Multi-Channel Mixer
21. Correct Disposal of this product. This marking indicates that this product should not be
disposed with other household wastes throughout the EU. To prevent possible harm to the
environment or human health from uncontrolled waste disposal, recycle it responsibly to
promote the sustainable reuse of material resources. To return your used device, please use
local return and collection systems or contact the retailer where the product was purchased.
They can take this product for safe environmentally friendly recycling.
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OPERATING MANUAL AND USER GUIDE
TABLE OF CONTENTS
1. Important Warnings and Safety Instructions ......................................... 1
2. Introduction ........................................................................................... 4
3. About the SL424USB Mixer .................................................................. 4
4. SL424USB Overview ............................................................................ 4
5. Features ............................................................................................... 5
6. SL424USB Front Panel ........................................................................ 6
7. Wiring Example .................................................................................... 6
8. Setting Up ............................................................................................. 7
9. Connections/Wiring .............................................................................. 7
10. USB Interface ...................................................................................... 9
11. Wiring Diagram .................................................................................. 10
12. Dimensional Drawings ....................................................................... 11
13. Block Diagram ................................................................................... 12
14. Specications .................................................................................... 13
15. Warranty ............................................................................................ 13
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SL424USB
INTRODUCTION
The Wharfedale Pro SL424USB Professional Mixer is the result of many years of experience in the
use, design and manufacture of professional sound reinforcement products. We take great pride in
engineering and building every Wharfedale Pro product and wish to thank you for entrusting us with
your sound.
From the time Gilbert Briggs built his first loudspeaker in 1932, to the present, Wharfedale
Professional products have maintained the same standard of quality in components, workmanship
and performance. Wharfedale are one of a few present day manufacturers that design, engineer
and build all of their own electronics.
Please take a few minutes to read this manual completely in order to ensure that you get the most
out of your SL424USB Mixer.
Multi-Channel Mixer
ABOUT THE SL424USB MIXER
The SL424USB is a high quality mixer designed to provide the best sound and features in a
compact package. It is designed to provide transparent and accurate mixing capability in an easy to
use package.
The mixer features 4 microphone/line inputs (channels 1-4). Each of these channels features low,
mid and high EQ, balanced inputs, and a full duplex USB playback and recording interface.
The stereo channels (channels 5/6 and 7/8) allow you to mix external devices into the show with
ease.
Easy to transport and quick to set up, the SL424USB Mixer is the ideal choice for the serious
professional.
SL424USB OVERVIEW
The SL424USB Mixer is a full featured multi-channel mixer designed to deliver the highest quality
sound for the best value. It is an ideal solution when you are looking for a high quality, cost effective
compact audio mixer for personal studio and live applications.
This 8-channel model was built to suit a variety of applications, from desktop recording and
AV production to smaller live performances. The Wharfedale SL424USB mixer offers a no-
nonsense mixing platform for use anywhere quality sound is required. The layout of the controls is
straightforward, so rst time users can be up and mixing in no time. Features like Mic and line inputs
and outputs, accurate 6-segment meters, Stereo Effects returns, Aux sends, Control Room outputs
for Left and Right Channels (to go to a separate amplier, perhaps in a recording control room) 3
band EQ, phantom power as well as a 1/4” headphone output provide added mix and monitoring
exibility.
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OPERATING MANUAL AND USER GUIDE
FEATURES
♦ High Quality Multi-Channel Mixer
♦ 16-bit 48kHz USB recording interface
♦ 8 Channels
♦ Channels 1 – 4
o XLR + TRS balanced inputs
o Gain adjustment
o 80Hz High Pass Filter
o 3 band (Low/Mid/High) EQ
o 1 Aux send
o EFX level control
o L/R pan control
o Phantom Power
o Peak LED
♦ Stereo Channels 5/6 – 7/8
o TRS balanced inputs
o +4/ -10dB switch
o EFX level control
o Pan adjustment
♦ Control Room Sends (L/R)
♦ USB to Mix Switch
♦ USB to Headphones/ Control Room Switch
♦ Effects to Aux Switch
♦ Headphone Outputs (TRS) with level control
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SL424USB FRONT PANEL
SL424USB
Multi-Channel Mixer
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OPERATING MANUAL AND USER GUIDE
CONNECTIONS/WIRING
The SL424USB input panel has one XLR plus one TRS connector for each of the rst 4 channels
and TRS connectors for Channels 5–8. Be sure to use a high quality shielded cable with suitable
connectors when connecting balanced sources.
Channels 1 – 4:
Balanced XLR microphone and line inputs make it easy to plug microphones into the mixer. Plug in
your mics, making sure the output volume is low with PAN and all EQ controls in the center detent
position with GAIN controls all the way down.
For best results, the gain throughout the system should be matched from one device to the next.
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2
3
4.
5
6
7
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(XLR connector) Balanced input +4dB
Mic
Use this input for audio interfaces and other line level
Line:
devices
High Pass Filter (24 dB/octave. –6dB @ 80 Hz & –
HPF:
30dB @ 20 Hz) cuts low frequencies.
This allows you to calibrate the channel to different
Gain:
sources and apply correct gain structure.
High EQ:
Mid EQ:
Low EQ:
Aux Pre:
the output level changes with the Channel Volume level
FX:
external effects processor,
Pan:
channel.
Peak LED
is too high. It is a good practice to only allow this light to
icker, not constantly glow.
Level:
Level control.
Centered at 12kHz. ±10dB of gain.
Centered at 1kHz. ±10dB of gain.
Centered at 80Hz. ±10dB of gain.
Sends signal to the Aux output. It is post fader so
Allows you to adjust the amount of the effect sent to an
Allows you to adjust the s patial placement of the
: This LED lights when the level of the input signal
Adjust the level of the channel signal to the Main Mix
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CHANNELS 5/6 – 7/8:
These channels allow you to plug stereo line level devices (digital
keyboards, sequencers, interfaces etc.) into the mixer.
SL424USB
Multi-Channel Mixer
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+4 / -10dB switch:
when plugging in various instruments and outboard gear.
to get the best signal to noise ratio
STEREO EFFECTS RETURN
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USB level:
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USB to Main Mix
the Main Mix output jack.
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USB to CR & Phones:
input to the headphone and CR output jacks.
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FX Send:
jack.
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FX Return:
19
FX to Aux:
20
CR & Phones
Control Room outputs
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+48V:
22
Phantom Power (+48v):
23
Power LED:
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Output Meter + Clip LED:
Main Mix and if the Main Mix signal is clipping.
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Main Mix
going to the Main Mix output jacks
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FX Return:
27
FX Send:
28
CR Out:
29
USB Connector:
30
Phones:
31
Main Output:
32
AC POWER IN:
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POWER:
connected to the output sends.
Adjusts the signal level of the USB playback.
: Send the signal from the USB input to
Send the signal from the USB
Adjust the level of the signal sent to the FX output
Adjust the level of the FX return input.
Routes the FX send bus to the Aux bus.
: Adjust the signal sent to the headphone and
Phantom Power switch for condenser microphones
Indicates global +48V supply
Indicates AC input and operation
Displays the output level of the
: This allows you to adjust the level of the signal
Connect the output of an outboard effect processor to this input jack.
Connect to the input of the outboard effect processor.
Connect to the inputs of an external amplier or powered speaker.
Connects to your computer for playback and recording.
For connecting stereo headphones.
Balanced outputs; TRS and XLR jacks
Use the standard supplied IEC mains power cable.
Switch the SL424 on or off. Be sure you turn it on BEFORE switching equipment
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OPERATING MANUAL AND USER GUIDE
Follow these few steps and you are on your way to a great sounding mix!
• Set the rst channel LEVEL control in the “12 o’clock” position. All others down (-∞)
• Speak into your mic (or start source material) and while watching the metering, slowly increase the
level using the GAIN control at the top of the channel. The CLIP (RED) LED should only icker.
• Adjust the EQ , keeping in mind that EQ adjustment will affect the output level.
• If the CLIP LED illuminates constantly, turn the GAIN control down (anti-clockwise) until the LED
ickers.
• Repeat for each channel used.
• Adjust the MAIN MIX control so that the CLIP LED only flickers – AVOID CONSTANT
ILLUMINATION!
• Once the mixer has an acceptable gain structure match each device in the signal chain, from the
mixer to the ampliers. Your target will be to get each device working at its optimum level, resulting
in a mix with a good signal to noise ratio.
USB INTERFACE
The USB connector enables computers with USB connectivity to interface directly with an SL Series
mixer for full duplex recording and playback. In recent years the introduction of USB connectivity
has ushered a new appreciation of the capabilities of computer audio, helping to fuse both digital
and analogue and open up endless possibilities for the recording musician.
The internal AD (Analogue to Digital) and DA (Digital to Analogue) converters are 16-bit/48KHz
enabling recording and playback above CD quality, ensuring that recordings that you make with an
SL Series Mixer have outstanding quality.
The SL Series are fully class compliant and require no drivers when used with modern operating
systems. Mac OSX, Windows XP, Vista and 7 will require no additional driver software.
Windows XP Installation
Simply choose the device in the following location: Start/Settings/Control Panel/Sounds and Audio
Devices/Audio
Mac OSX Installation
Simply select as an input and output device using the "Audio MIDI Setup" page, you can nd this
easily using the spotlight function.
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WIRING DIAGRAM
SL424USB
SL424USB
Multi-Channel Mixer
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OPERATING MANUAL AND USER GUIDE
DIMENSIONAL DRAWINGS
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BLOCK DIAGRAM
SL424USB
Multi-Channel Mixer
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OPERATING MANUAL AND USER GUIDE
SPECIFICATIONS
0dBu=0.775Vrms
Maximum Balanced Output
Level (1% T.H.D. at 1kHz )
Maximum Unbalanced
Output Level
(1% T.H.D. at 1kHz )
THD+N
Frequency Response
Hum and Noise
20Hz-20Khz (150R)
S/N
FFT
CMRR
Maximum Input Level
Impedances
Mono Input Channel Gain
Input Channel EQ
Level Meter
AC Power
Product Dimension
(MM)(HxWxD)
Carton Dimension
(MM)(HxWxD)
Net Weight:
Gross Weight:
Main XLR Balanced out +26.5dBu ±1dBu
Main 1/4" Jack Balanced out +26.5dBu ±1dBu
Main XLR Unbalanced out +21dBu ±1dBu
Main 1/4" Jack Unbalanced out +21dBu ±1dBu
Headphone output 150mw±5mw @ 32ohms
<0.055% @ + 14dBu ±0.5dBu
20Hz~20kHz±2dB
-127dBu ±5dBu Mic Pre Equivalent Input Noise
-85dBu ±5dBu Residual Noise
89dB ±5dB @ fader max
-65dBv ±5dBv @ max fader gain
55dB ±5dB @ 1kHz
Mic +4dBu ±1dBu
Channel Line 25dBu ±1dBu
Stereo Line +21dBu ±1dBu
AUX Return In +21dBu ±1dBu
Mic: Balanced 6kΩ, Unbalanced 3kΩ ±500Ω
Line: Balanced 44kΩ, Unbalanced 22kΩ ±2kΩ
AUX Return: Balanced 20kΩ, Unbalanced 10kΩ ±2kΩ
All other Unbalanced outputs:100Ω, Balanced outputs: 200Ω
50dB Variable MIC (0~-50dB) Line (-20dB~+30dB)
High (+/-10dB) ±1.5dBu 12kHz Shelving
Mid (+/-10dB) +/-1.5dBu 1kHz Shelving
Low (+/-10dB) ±1.5dBu 80Hz Shelving
4 Segment LEDx2 (output of +4dB = 0dB) Main L/R
AC100V-240V, 50Hz/60Hz
248 x 265 x 92.5 mm / 9.76" x 10.43" x 3.64"
365 x 136 x 343 mm / 14.37" x 5.35" x 13.50"
2.7 Kgs / 6 LBS
4.26 Kgs / 9.47 LBS
WHARFEDALE PRO LIMITED WARRANTY
Wharfedale Pro SL Series products are warranted of manufacturing or material defects for a
period of one year from the original date of purchase. In the event of malfunction, contact your
authorized Wharfedale Pro dealer or distributor for information.
*Be aware that warranty details may differ from country to country. Contact your dealers or
distributor for information. These terms do not infringe your statutory rights.
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Wharfedale Professional
IAG House, 13/14 Glebe Road, Huntingdon, Cambridgeshire, PE29 7DL, UK
www.wharfedalepro.com
Wharfedale Professional reserves the right to alter or improve specications without notice.
All rights reserved © 2011 Wharfedale Pro. Wharfedale Pro is a member of the IAG Group.
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