OWNER’S MANUAL
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance
with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves,
or other apparatus (including amplifiers) that produce heat.
9. Only use attachments/accessories specified by the manufacturer.
10. Use only with a cart, stand, tripod, bracket, or table
specified by the manufacturer, or sold with the
apparatus. When a cart is used, use caution when
moving the cart/apparatus combination to avoid injury
from tip-over.
CAUTION
RISK OF ELECTRIC SHOCK! DO NOT OPEN!
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT
REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE.
Big Knob Passive Monitor Controller
shock, do not expose this apparatus to rain or moisture.
REFER SERVICING TO QUALIFIED PERSONNEL.
The lightning flash with arrowhead symbol within
an equilateral triangle is intended to alert the user
to the prescence of uninsulated “dangerous voltage”
within the product’s enclosure, that may be of significant magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is
intended to alert the user of the prescence of important
operating and maintaining (servicing) instructions in the
literature accompanying the appliance.
WARNING — To reduce the risk of fire or electric
PORTABLE CART
WARNING
11. Refer all servicing to qualified service personnel. Servicing is required when
the apparatus has been damaged in any way, such as power-supply cord
or plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.
12. Exposure to extremely high noise levels may cause permanent hearing loss.
Individuals vary considerably in susceptibility to noise-induced hearing loss,
but nearly everyone will lose some hearing if exposed to sufficiently intense
noise for a period of time. The U.S. Government’s Occupational Safety and
Health Administration (OSHA) has specified the permissible noise level
exposures shown in the following chart.
According to OSHA, any exposure in excess of these permissible limits could
result in some hearing loss. To ensure against potentially dangerous exposure
to high sound pressure levels, it is recommended that all persons exposed
to equipment capable of producing high sound pressure levels use hearing
protectors while the equipment is in operation. Ear plugs or protectors in the
ear canals or over the ears must be worn when operating the equipment in
order to prevent permanent hearing loss if exposure is in excess of the limits
set forth here:
Duration,
per day in
hours
8 90 Duo in small club
6 92
4 95 Subway Train
3 97
2 100 Very loud classical music
1.5 102
1 105 Jon screaming at Troy about deadlines
0.5 110
0.25 or less 115 Loudest parts at a rock concert
Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan.
Apparatet må tilkoples jordet stikkontakt.
Apparaten skall anslutas till jordat uttag.
Sound Level dBA,
Slow Response
Typical Example
Correct disposal of this product: This symbol indicates that this product should not be disposed of with your household waste, according to the WEEE directive
(2012/19/EU) and your national law. This product should be handed over to an authorized collection site for recycling waste electrical and electronic equipment (EEE).
Improper handling of this type of waste could have a possible negative impact on the environment and human health due to potentially hazardous substances that are generally
associated with EEE. At the same time, your cooperation in the correct disposal of this product will contribute to the effective usage of natural resources. For more information
about where you can drop off your waste equipment for recycling, please contact your local city office, waste authority, or your household waste disposal service.
Please write your serial number here for future
reference (i.e., insurance claims, tech support,
return authorization, make dad proud, etc.)
Purchased at:
Date of purchase:
2
Big Knob Passive Monitor Controller
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Part No. SW1191 Rev. A 12/16
©2016 LOUD Technologies Inc. All Rights Reserved.
Contents
Owner’s Manual
Introduction
IMPORTANT SAFETY INSTRUCTIONS ...............................................2
TABLE OF CONTENTS ........................................................................3
BIG KNOB PASSIVE FEATURES .........................................................3
INTRODUCTION ...............................................................................3
QUICK START ...................................................................................3
HOOKUP DIAGRAM .........................................................................4
REAR PANEL DESCRIPTION .............................................................5
1. 1/4" SOURCE INPUTS......................................................5
2. 1/8" STEREO LINE INPUT ................................................5
3. MON OUTPUTS ................................................................5
FRONT PANEL DESCRIPTION ............................................................6
4. SOURCE SELECT SWITCH .................................................6
5. MONITOR SELECT SWITCH ..............................................6
6. MONO SWITCH ...............................................................6
7. MUTE SWITCH ................................................................6
8. DIM SWITCH ...................................................................6
9. VOLUME KNOB [AKA BIG KNOB] ....................................6
APPENDIX A: SERVICE INFO ............................................................7
TROUBLESHOOTING / REPAIR .............................................7
APPENDIX B: TECHNICAL INFORMATION .........................................8
BIG KNOB PASSIVE SPECIFICATIONS .......................................8
BIG KNOB PASSIVE DIMENSIONS ............................................9
BIG KNOB PASSIVE BLOCK DIAGRAM ...................................10
BIG KNOB PASSIVE LIMITED WARRANTY ......................................11
The Big Knob Passive benefits from a proven,
bestselling design to deliver professional level control,
plus source and monitor selection for studios of any size.
The passive audio path ensures pristine sonic integrity
is maintained throughout your signal chain. More than
just a level control solution, Big Knob Passive features
the ability to choose between two sources and two
monitor pairs.
Ideal for simple level control at a home or project
studio or for integration in a large studio or group of
editing suites, Big Knob Passive is the “Built-Like-ATank,” affordable monitoring control solution.
Quick Start
We realize that you can’t wait to hook up your Big
Knob Passive and try it out. Nevertheless, please take
the time to read this page NOW, and the rest can wait
until you’re good and ready.
1. Turn down all knobs.
2. Disengage all switches.
3. Plug signal sources into the Big Knob, such as:
• Audio interface.
• Line-level sources such as keyboards, drum
machines, or MP3 players plugged into the
line-level inputs.
• Other stereo playback devices.
Big Knob Passive Features
• Excruciatingly simple 2x2 monitor controller
• Choose between two sources and two
monitor pairs.
• Classic Big Knob volume control.
• Professional mono, mute and dim functions.
•
Pristine audio quality
• Passive audio path with no power supply needed.
•
Sturdy “Built-Like-A-Tank” design
4. Connect cords from the monitor outs to powered
speakers (or to an amplifier connected to passive
speakers).
5. Turn the powered studio monitors (or amplifiers) on.
6. Be sure that the volume of the input is the same
as it would be during normal use.
7. Engage the desired input source select and monitor
select switches.
8. Slowly bring up the volume knob to a comfortable
listening level.
Owner’s Manual
3
Hookup Diagram
DAW
Big Knob Passive Monitor Controller
Big Knob Passive is the perfect monitoring tool as a level control for a home / project studio
or integrated as part of a larger studio. There are many great things about the Big Knob Passive,
but one of the features is no need for power...it can be placed anywhere to your heart’s content!
After you’ve decided on a spot, it’s time to make connections.
In this example, a computer installed with your favorite DAW is connected to the Source Input A
L/R jacks. The Source Input B jacks may accept 1/4" inputs and an 1/8" stereo input. If both inputs are
connected simultaneously, the 1/8" stereo line input will take priority over the 1/4" connection. In this
case, we hooked up a smartphone to the 1/8" stereo line input jack.
The output section is as straightforward as the input section. Here we connected a pair
of XR Series studio monitors to the Mon Output A L/R jacks and a pair of MRmk3 Series studio
monitors to the Mon Output B L/R jacks.
Now that connections have been made, the fun begins! The top panel has a variety of switches,
buttons and something else...what was it? Oh yeah, a BIG knob, dead center! These allow you to select
between the inputs, outputs, control levels and more. Descriptions of the Big Knob Passive features starts
on the next page...
Typical Big Knob Passive Setup
4
Big Knob Passive Monitor Controller
Rear Panel Description
SLEEVE
SLEEVE
The rear panel is where to connect various sources
feeding IN to the Big Knob Passive. These signals are
then routed through the Big Knob Passive and released
through the monitor OUT jacks.
2
2. 1/8" Stereo Line Input
Owner’s Manual
The stereo line input may accept an 1/8" line-level
signal from a smartphone, MP3 player, or other signal
source.
The Source Input B 1/4" and 1/8" linelevel connections may be connected
simultaneously. If both inputs are
connected simultaneously, the 1/8" stereo
line input will take priority over the 1/4" connection.
3 1
1. 1/4" Source Inputs
Connect the L/R line-level signals from the source(s)
to the 1/4" source input jack(s).
• The source input connectors accept balanced
or unbalanced signals.
• Unbalanced TS (tip-sleeve) lines can be accommodated
via the TRS jack. Make sure the cable terminates with
a TS plug (like a guitar plug), or if it’s a TRS plug (such
as a headphone plug), make sure the ring is tied to the
sleeve and that the plug is fully inserted into the jack.
The connectors are wired as follows (per the AES/IEC
standard):
Balanced 1/4" TRS
Hot (+) Tip
Cold (–) Ring
Shield (Ground) Sleeve
3. 1/4" Mon Outputs
Connect the L/R mon outputs to the inputs of powered
studio monitors or to a power amplifier driving passive
speakers.
The mon outputs are fed by the “control room bus.”
This is the signal path fed from the source input
currently selected with the source select button and
routed through the volume knob.
• The mon output connectors accept balanced
or unbalanced signals.
• Unbalanced TS (tip-sleeve) lines can be accommodated
via the TRS jack. Make sure the cable terminates with
a TS plug (like a guitar plug), or if it’s a TRS plug (such
as a headphone plug), make sure the ring is tied to the
sleeve and that the plug is fully inserted into the jack.
The connectors are wired per the AES/IEC standard
as seen in the illustrations to the left.
SLEEVERING
TIP
Balanced 1/4" Connectors
Unbalanced 1/4" TS
Hot (+) Tip
Cold (–) Ring
Shield (Ground) Sleeve
SLEEVE
TIP
Unbalanced 1/4" Connectors
SLEEVE
RING
TIP
TIP
RING
TIP
TIPSLEEVE
Owner’s Manual
5
Front Panel Description
The front panel is where the magic happens!
Once all of the connections on the rear panel have
been made, there are several switches and a level
control that you may use, manipulate and set to your
heart’s content. Please read on...
9
7. Mute Switch
The mute switch does just what it sounds like it
does. It turns off the signal by “routing” it into oblivion.
Engaging the mute switch (almost) provides the same
result as turning the volume knob all the way down.
8. Dim Switch
Pressing this button turns down the signal going
to the monitor outputs by 20 dB. This allows you to
essentially “turn down” the speakers to converse
without affecting the speaker level.
9. Volume Knob [aka Big Knob]
DIMMONO
4 5
MUTE
6 8
7
4. Source Select Switch
Engage / disengage the switch to select the source
input. Leave this switch disengaged – up position – to
select input source A. Press this switch – down position
– to select input source B.
Big Knob Passive Monitor Controller
5. Monitor Select Switch
Engage / disengage the switch to select the monitor
output. Leave this switch disengaged – up position – to
route the currently selected input source to the monitor
A output jacks. Press this switch – down position – to
route the currently selected input source to the monitor
B output jacks.
Last, but certainly not least, the money maker!
The volume knob – aka Big Knob – adjusts the
volume of the selected input source’s signal going
to the selected monitor outputs. The volume knob
ranges from OFF (∞) to unity gain (MAX).
WARNING: Always turn the volume
knob all the way down before making
connections or trying something new.
Keep it down until all changes have been
made, then turn it up slowly. This saves your speakers –
and more importantly, your ears – from blowing.
6. Mono Switch
Mono is short for mononucleosis. It is an infection
that typically leads to a feeling of tiredness, although
one could also get headaches, a sore throat, swollen
glands and more. Thankfully, engaging the mono switch
here does not produce the infection. Rather, the mono
here is short for monophonic.
Pressing the mono switch combines the stereo
signal into a monophonic signal at the monitor outputs.
The left and right input signals are summed and the
mono signal is output at both the left and right outputs.
This allows you to check for phase problems in the
stereo signal when played over a monophonic system.
6
Big Knob Passive Monitor Controller
Appendix A: Service
Owner’s Manual
Information
If you think your Big Knob Passive has a problem,
please check out the following troubleshooting tips and
do your best to confirm the problem. Visit the Support
section of our website (www.mackie.com/support)
where you will find lots of useful information such as
FAQs and documentation. You may find the answer
to the problem without having to send your Big Knob
Passive away.
Troubleshooting
No Power
• Our favorite question: Is it plugged in? If you answered
“yes” to this question, then you’re reading the wrong
owner’s manual. The Big Knob Passive does not get
“plugged in”!
No Sound
• Is the signal source turned up? Make sure the signal
level from whatever device(s) immediately precedes
the Big Knob Passive is high enough to produce sound.
• Is the Big Knob Passive level control turned up?
• Are the source and monitor select switches in their
correct positions?
• Is the mute switch engaged?
Bad Sound
• Are the input and output connectors plugged
completely into the jacks? Make sure they are
plugged all the way in.
• Is it loud and distorted? Reduce the signal level
at the source(s).
Noise/Hum/Buzz
• Check the signal cable between the source(s) and the
Big Knob Passive. Make sure all connections are secure.
These problems usually produce crackling noises, hum,
or buzz.
• Make sure the signal cable is not routed near AC cables,
power transformers, or other EMI sources (including
wall warts and line lumps!). These sources usually
produce hum.
• Excessive hiss is an indication of an incorrect gain
setting somewhere before the Big Knob Passive.
• If possible, listen to the signal source with headphones
plugged in. If it sounds noisy there, it’s not the Big Knob
Passive.
Repair
For warranty service, please refer to the warranty
information on page 11.
Non-warranty service is available at a factoryauthorized service center. To locate the nearest service
center, visit www.mackie.com, click “Support” and select
“Locate a Service Center or Distributor”.
Knob Passive living outside the United States may be
obtained through local dealers or distributors.
If you do not have access to our website, please call
our Tech Support department at 1-800-898-3211 (normal
business hours, Pacific Time), to explain the problem.
They will tell you where the nearest factoryservice center is located in your area.
Service for a Big
authorized
Need help with the Big Knob Passive?
• Visit www.mackie.com and click Support to find: FAQs, manuals, and addendums.
• Telephone 1-800-898-3211 to speak with one of our splendid technical support
chaps (Monday through Friday, normal business hours, Pacific Time).
Owner’s Manual
7
Appendix B: Technical
Information
Big Knob Passive Specifications
Frequency Response
0 dBu Input: ±1 dB, 10 Hz – 30 kHz
Distortion (THD+N)
0 dBu Input @1 kHz: <0.005 %
Crosstalk (20 Hz – 20 kHz)
0 dBu Input @1 kHz: <–85 dB
Attenuation
Muted: –100 dB
Big Knob Passive Monitor Controller
Signal-To-Noise Ratio
A–weighted: <–100 dB
Maximum Levels
All inputs: +22 dBu
1/4" outputs: +15 dBu
Input Type
Input Type: Female 1/4" balanced / unbalanced
Female 1/8" unbalanced
Output Type
Output Type: Female 1/4" balanced / unbalanced
Physical Dimensions and Weight
Height: 3.1 in / 79 mm
Width: 5.4 in / 137 mm
Depth: 5.6 in / 142 mm
Weight: 2.2 lb / 1.0 kg
Disclaimer
LOUD Technologies is always striving to improve our products
by incorporating new and improved materials, components and
manufacturing methods. Therefore, we reserve the right to
change these specifications at any time without notice.
8
Big Knob Passive Monitor Controller
3.1" /
79 mm
WEIGHT
2.2 lb /
1.0 kg
Big Knob Passive Dimensions
5.6" /
142 mm
Owner’s Manual
5.4" / 137 mm
3.1" /
WEIGHT
2.2 lb /
1.0 kg
79 mm
Owner’s Manual
9
Big Knob Passive Block Diagram
MUTE
MONO
Stereo
Mute
Mono
Big Knob Passive Monitor Controller
DIM
0 dB
–20 dB
10
Big Knob Passive Monitor Controller
L (MONO)
L (MONO)
Source B Inputs
1/8” • 3,5 mm stereo input
defeats the 1/4” • 6,35 inputs
Limited Warranty
Please keep your sales receipt in a safe place.
This Limited Product Warranty (“Product Warranty”) is provided by LOUD Technologies Inc. (“LOUD”)
and is applicable to products purchased in the United States or Canada through a LOUD-authorized
reseller or dealer. The Product Warranty will not extend to anyone other than the original purchaser
of the product (hereinafter, “Customer,” “you” or “your”).
For products purchased outside the U.S. or Canada, please visit www.mackie.com to find contact
information for your local distributor, and information on any warranty coverage provided by the
distributor in your local market.
LOUD warrants to Customer that the product will be free from defects in materials and workmanship
under normal use during the Warranty Period. If the product fails to conform to the warranty then LOUD
or its authorized service representative will at its option, either repair or replace any such nonconforming
product, provided that Customer gives notice of the noncompliance within the Warranty Period to the
Company at: www.mackie.com or by calling LOUD technical support at 1.800.898.3211 (toll-free
in the U.S. and Canada) during normal business hours Pacific Time, excluding weekends or LOUD
holidays. Please retain the original dated sales receipt as evidence of the date of purchase. You will
need it to obtain any warranty service.
Owner’s Manual
For full terms and conditions, as well as the specific duration of the Warranty for this product, please
visit www.mackie.com.
The Product Warranty, together with your invoice or receipt, and the terms and conditions located
at www.mackie.com constitutes the entire agreement, and supersedes any and all prior agreements
between LOUD and Customer related to the subject matter hereof. No amendment, modification
or waiver of any of the provisions of this Product Warranty will be valid unless set forth in a written
instrument signed by the party to be bound thereby.
Owner’s Manual
11
16220 Wood-Red Road NE
Woodinville, WA 98072 • USA
Phone: 425.487.4333
Toll-free: 800.898.3211
Fax: 425.487.4337
www.mackie.com
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