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CRITICAL MASS
Studio-Quality Vocal Stompbox for
Large Group-Sound E ects
User Manual
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Important Safety
Instructions
Terminals marked with this symbol carry
electrical current of su cient magnitude
to constitute risk of electric shock.
Use only high-quality professional speaker cables with
¼" TS or twist-locking plugs pre-installed. Allother
installation or modi cation should be performed only
by quali edpersonnel.
This symbol, wherever it appears,
alertsyou to the presence of uninsulated
dangerous voltage inside the
enclosure-voltage that may be su cient to constitute a
risk ofshock.
This symbol, wherever it appears,
alertsyou to important operating and
maintenance instructions in the
accompanying literature. Please read the manual.
Caution
To reduce the risk of electric shock, donot
remove the top cover (or the rear section).
No user serviceable parts inside. Refer servicing to
quali ed personnel.
Caution
To reduce the risk of re or electric shock,
do not expose this appliance to rain and
moisture. The apparatus shall not be exposed to dripping
or splashing liquids and no objects lled with liquids,
suchas vases, shall be placed on the apparatus.
Caution
These service instructions are for use
by quali ed ser vice personnel only.
Toreduce the risk of electric shock do not perform any
servicing other than that contained in the operation
instructions. Repairs have to be performed by quali ed
servicepersonnel.
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 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 ampli ers) that produce heat.
9. Do not defeat the safety purpose of the polarized
or grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding-type plug
has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. Ifthe
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 plugs, convenience receptacles,
and the point where they exit from the apparatus.
11. Use only attachments/accessories speci ed by
themanufacturer.
12. Use only with the
cart, stand, tripod, bracket,
or table speci ed by the
manufacturer, orsold with
the apparatus. When a cart
is used, use caution when
moving the cart/apparatus
combination to avoid
injury from tip-over.
13. Unplug this apparatus during lightning storms or
when unused for long periods of time.
14. Refer all servicing to quali ed 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
beendropped.
15. The apparatus shall be connected to a MAINS socket
outlet with a protective earthing connection.
16. Where the MAINS plug or an appliance coupler is
used as the disconnect device, the disconnect device shall
remain readily operable.
17. Correct disposal of this
product: This symbol indicates that
this product must not be disposed
of with household waste,
according to the WEEE Directive
(2012/19/EU) and your national
law. This product should be taken
to a collection center licensed for the recycling of waste
electrical and electronic equipment (EEE). The
mishandling 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 e cient use of natural resources. For more
information about where you can take your waste
equipment for recycling, please contact your local city
o ce, or your household waste collection service.
18. Do not install in a con ned space, such as a book
case or similar unit.
19. Do not place naked ame sources, such as lighted
candles, on the apparatus.
20. Please keep the environmental aspects of battery
disposal in mind. Batteries must be disposed-of at a
battery collection point.
21. Use this apparatus in tropical and/or
moderate climates.
LEGAL DISCLAIMER
MUSIC Group accepts no liability for any loss which
may be su ered by any person who relies either
wholly or in part upon any description, photograph,
or statement contained herein. Technical speci cations,
appearances and other information are subject to
change without notice. All trademarks are the property
of their respective owners. MIDAS, KLARK TEKNIK,
LAB GRUPPEN, LAKE, TANNOY, TURBOSOUND,
TC ELECTRONIC, TC HELICON, BEHRINGER, BUGERA
and DDA are trademarks or registered trademarks
of MUSIC Group IP Ltd. © MUSIC Group IP Ltd.
2017 All rights reserved.
LIMITED WARRANTY
For the applicable warranty terms and conditions
and additional information regarding MUSIC Group’s
Limited Warranty, please see complete details online at
music-group.com/warranty.
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1. Controls
(1) (2) (3)
(4)
(5)
(6)
(7)
(1) STYLE knob selects the type of group vocal sound applied to your voice.
• Melodic – simulates a large group singing along with you. Think “we will
rock you”.
• Gang - great for less note-based crowd sounds like “hey!“
• The four styles include unison and doubled octave voices to ll
out the higher and lower registers. Experiment with each one
to nd the right t for your song.
(2) MIX knob adjusts the blend between the group vocals and your lead voice.
(3) REVERB knob selects the type and amount of reverb eff ect on your voice.
The 3 types of reverb appear in order from the smallest space (Room) to
the largest (Hall). Adjusting the knob within your preferred reverb space
determines how pronounced the eff ect will be.
Turning the knob fully counterclockwise turns the reverb off .
(8)
(9) (10)(11)(12)
(8) USB input accepts a micro USB cable for connection to a computer.
Use the VoiceSupport application to install rmware updates, and for
other features depending on your product. Download VoiceSupport from
tc-helicon.com/products/voicesupport/
(9) ON/OFF switch powers the pedal on and o .
(10) POWER input accepts a 9V power cable (not included).
(11) OUT jack accepts a balanced XLR cable for connection to a mixer or
active speaker.
(12) MIC input jack accepts a balanced XLR cable to connect your microphone.
(4) BATTERY LED indicates the battery level, with green showing full life,
yellow being partial life, and red to alert that the batteries
should be changed.
(5) TONE button engages a preset combination of adaptive EQ, de-essing,
compression and noise gate. “Normal“ and “Less Bright” settings can be
toggled by holding the Tone button and pressing the footswitch.
(6) ON/OFF LED lights when the eff ect is engaged.
(7) FOOTSWITCH bypasses the group eff ect with a single tap. Holding the
switch down for a few seconds bypasses the group and reverb eff ects,
allowing you to talk to the audience between songs. Tap the switch again
to resume normal function reverb.
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2. Operation
Micro USB cable
Power cable
Connection
• Connect a microphone to the MIC jack
• Connect the OUT jack to a mixer, interface or active speaker
• Connect the power cable (not included)
• Connect a micro USB cable to a computer (optional)
Changing the Batteries
MP-75 microphone
Mixing board
Auto Gain
Critical Mass will automaticall
y adjust the gain setting for your microphone,
eliminating the need for manual adjustments and ensuring that a good signal is
passed to the mixer without any unwanted distortion.
24 V Phantom Power
Phantom power is always active on the Critical Mass. This will power condenser
microphones, but will not a ect dynamic mics.
The Critical Mass can operate on 4 AA batteries. Remove the single screw on
the bottom of the pedal to open the battery door. Make sure to observe correct
polarity when inserting the batteries.
Mic Control
Mic Control allows you to control the e ect's on/o status via an MP-75
microphone. Press and hold the footswitch while powering up the unit to
toggle Mic Control.
Note that when using a condenser microphone, Mic Control should be disabled
to prevent unwanted on/o switching.
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3. Speci cations
Input Mic
Input Connector: XLR female, balanced
Input Impedance: 3k4/1k7 Ohm
Input Clip Sensitivity: -1 dBu
SNR A-weighted: >114 dB
Output
Output Connector: XLR male, impedance balanced,
pin 2 hot
Output Impedance: 200/100 Ohm
Output Full Scale Level: +7.5 dBu
Input to Output Freq Response: +0/-0.3 dB, 20 Hz to 20 kHz
Power
Power Supply: 9 V / 670 mA
Power Consumption: 6 W
Requirements
Operating Temperature: 32°F to 122°F (0°C to 50°C)
Storage Temperature: -22°F to 167°F (-30°C to 70°C)
Humidity Max.: 90 % non-condensing
Size & Weight
Dimensions: 5.4" x 3.5" x 2.3" (140 x 90 x 60 mm) Weight: 0.92 lb. (420 g)
Warra nty
See tc-helicon.com/support for warranty information
Due to continuous development, these speci cations are subject to change
without notice.
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