Community SONUS Series User manual

SONUS Series
Portable Linear-Response
Loudspeaker Systems
Operation Manual

Community SONUS Series - Operation and Installation Manual - Page 2
EC STATEMENT OF CONFORMITY
This document confirms that the range of products of Community Professional Loudspeakers bearing
the CE label meet all of the requirements in the EMC directive 89/336/EEC laid down by the Member
States Council for adjustment of legal requirements. Furthermore, the products comply with the rules
and regulations referring to the electromagnetic compatibility of devices from 30-August-1995.
The Community Professional Loudspeaker products bearing the CE label comply with the following
harmonized or national standards:
DIN EN 55013:08-1991
DIN EN 55020:05-1995
DIN EN 55082-1:03-1993
The authorized declaration and compatibility certification resides with the manufacturer and can be
viewed upon request. The responsible manufacturer is the company:
Community Light & Sound
333 East 5th Street
Chester, PA 19013
USA
TEL: [phone]
FAX: [phone]
Chester, PA USA February 2007

Community SONUS Series - Operation and Installation Manual - Page 3
WELCOME TO COMMUNITY!
Since 1968, Community has been designing and building innovative loudspeaker products for the
worldwide sound reinforcement industry. Founded by Bruce Howze, who remains the principal
designer to this day, the company has achieved numerous ‘firsts’ in technology breakthroughs. Some
of these include:
First - fiberglass composite loaded midrange horn for touring systems – the LMF.
First - large-scale fiberglass horns used on Elvis Presley’s 1971 tour.
First - testing and documentation of loudspeakers in a free field acoustical
environment.
First - to publish coverage patterns of its loudspeakers, setting the industry standard.
First - mid-range compression driver, the M4.
First - carbon fiber diaphragm compression driver.
First - passive loudspeakers with internal multi-band, multi-level processing.
First - Ferrofluid-cooled professional cone drivers.
First - HF compression driver diaphragm without an outer suspension – the VHF100.
Community’s philosophy is to build products that are uncompromised in sound quality, reliability,
durability and flexibility, all at a fair price. We provide comprehensive technical support and we stand
behind every product we manufacture. We pledge to do our best to insure that you are satisfied with
your Community purchase!
Community Professional Loudspeakers
333 East Fifth Street
Chester, PA 19013 USA
TEL: [phone]
FAX: [phone]
©2007 All Rights Reserved

Community SONUS Series - Operation and Installation Manual - Page 4
TABLE OF CONTENTS
TABLE OF FIGURES ............................................................................................... 5
IMPORTANT SAFETY INFORMATION .............................................................................. 5
C-TIPS ............................................................................................................ 6
PRECAUTIONS &SAFETY CONSIDERATIONS .................................................................... 6
SONUS SERIES OPERATION MANUAL ....................................... 7
INTRODUCTION.................................................................................................... 7
SONUS FEATURES AND TECHNOLOGY ......................................................................... 7
UNPACKING AND INSPECTION ................................................................................... 8
SONUS Specifications............................................................................................9
GETTING ACQUAINTED ..........................................................................................10
Physical Features Of SONUS Full-Range Models ...................................................... 11
Physical Features Of SONUS Subwoofers ............................................................... 13
GENERAL DESCRIPTION .........................................................................................14
DNYA-TECH DRIVER PROTECTION SYSTEM....................................................................14
HIGH-FREQUENCY PRESENCE SWITCH.........................................................................15
SELECTABLE HIGH-PASS OUTPUT ON SUBWOOFERS.........................................................16
COOL-COIL™TECHNOLOGY ....................................................................................18
OPERATING IN PASSIVE OR BI-AMPED MODE ................................................................18
HIGH-PASS FILTERS ............................................................................................19
CHOOSING ACTIVE CROSSOVERS ..............................................................................19
USING PROTECTIVE LIMITERS ..................................................................................20
CONNECTING THE AMPLIFIER TO THE LOUDSPEAKER ........................................................22
SONUS APPLICATIONS.........................................................................................32
POSITIONING SUBWOOFERS ....................................................................................33
SYSTEM EQUALIZATION .........................................................................................37
RIGGING AND MOUNTING SONUS ENCLOSURES ............................................................40
SONUS RIGGING AND MOUNTING HARDWARE ..............................................................47
1. Seat Track Kit: STKIT..................................................................................... 47
2. Vertical Fly Kit: VFKIT...................................................................................... 49
AVAILABLE ACCESSORIES.......................................................................................54
SERVICING SONUS LOUDSPEAKERS ..........................................................................55
TROUBLESHOOTING GUIDE .....................................................................................55
REPLACEMENT PARTS............................................................................................57
SUMMING THINGS UP...........................................................................................57
WARRANTY INFORMATION AND SERVICE ......................................................................58
Notice: Every effort was made to insure that the information contained in this manual
was complete and accurate at the time of printing. However, due to ongoing technical
advances, changes or modifications may have occurred that are not covered in this manual.

Community SONUS Series - Operation and Installation Manual - Page 5
TABLE OF FIGURES
Following is a list of figures found in this manual:
Figure Title Page
1 Physical Features of Typical SONUS Full-Range Models 10
2 Physical Features of Typical SONUS Subwoofers 12
3 Graph Depicting Frequency Response of MUSIC / VOICE Presence Switch 16
4 Graph Depicting Response of HIGH-PASS / FLAT Switch 17
5 Community’s Cool-Coil™ Heat Evacuation System 18
6 SONUS Full-Range Input Panel 22
7 SONUS Subwoofer Input Panel 25
8 Single Amp Connections 26
9 Bi-amp Connections 26
10 Effect of Clipping on a Sinewave 30
11 Effect of Boundary Surfaces on Power Output 34
12 Load Angles 43
13 Never Reeve Cables! 43
14 Never Reeve Cables! 45
15 STKIT Assembly of SONUS Enclosure with 4 Seat Track Channels and M10
Hardware 49
16 VFKIT Vertical Fly Kit Assembly 50
17 Never Reeve Cables! 52
18 Rigging Three Enclosures with the VFKIT 52
19 Rigging Four Enclosures with the VFKIT 53
IMPORTANT SAFETY INFORMATION
Always follow these basic safety precautions when using or installing SONUS loudspeakers
and accessories:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions, particularly those pertaining to rigging, mounting,
hanging and electrical connections.
5. Only use accessories that are specified and approved by the manufacturer.
The terms CAUTION, WARNING, and DANGER are used throughout this manual to alert
the reader to important safety considerations. If you have any questions or do not
understand the meaning of these terms, do not proceed with installation. Contact your
local dealer, distributor, or call Community directly for assistance. These terms are defined
below:
CAUTION: describes an operating condition or user action that may expose the equipment
or user to potential damage or danger.
WARNING: describes an operating condition or user action that will likely cause damage to
the equipment or injury to the user or to others in the vicinity.
DANGER: describes an operating condition or user action that will immediately damage the
equipment and/or be extremely dangerous or life threatening to the user or to others in the
vicinity.

Community SONUS Series - Operation and Installation Manual - Page 6
C-TIPS
Occasionally, in this manual, you’ll come across some useful tips that are intended to help
you get the most from your use of SONUS loudspeakers in portable applications and fixed
installations. We call these C-TIPS (short for COMMUNITY-TIPS or COOL-TIPS…we’ll let
you decide!). These tips originate from Community staff members as well as from installers
and end users. We welcome any C-TIPS that you may want to share with us, and we’ll
acknowledge you as the source if we print them in future user’s manuals.
PRECAUTIONS & SAFETY CONSIDERATIONS
English
The loudspeakers described in this manual are designed and intended to be ‘flown’ or
suspended for maximum acoustical performance using a variety of rigging hardware,
means, and methods. It is essential that all installation work involving the suspension of
these loudspeaker products be performed by competent, knowledgeable persons who
understand safe rigging practices. Severe injury and/or loss of life may occur if these
products are improperly installed. Please read the section on rigging for additional
information.
Français
Les haut-parleurs décrits dans ce manuel sont conçus et sont projetés pour être ‘volé’ ou
suspendu pour l'exécution acoustique maximum utilisant une assortiment d'équiper
matériel, les moyens, et les méthodes. C'est essentiel que tout travail d'installation ait
impliqué la suspension de ces produits d'haut-parleur est exécutée par les personnes
compétentes et entraînées qui comprennent équiper les pratiques sûres. La perte sévère
de et/ou de blessure de vie peut arriver si ces produits sont incorrectement installés. S'il
vous plaît lire la section d'équiper pour l'information supplémentaire.
Deutsch
Die Lautsprecher, die in diesem Handbuch beschrieben werden, sind entworfen und sind zu
sein ‘geflogen' vorgehabt oder sind für maximale hörbare Leistung verschiedene
Manipulierenhardware, Mittel, und Methoden suspendiert benutzend. Es ist wesentlich,
dass alle Installationarbeit, die die Aufhängung von diesen Lautsprechernprodukten
verwickelt, von fähigen, ausgebildeten Personen durchgeführt werde, die sichere
Manipulierenpraxis verstehen. Schwere Verletzung bzw. Verlust des Lebens können
stattfinden, wenn diese Produkte unrichtig installiert sind. Bitte lesen Sie den Abschnitt
über Manipulieren für zusätzliche Informationen.
Italiano
Gli altoparlanti descritti in questo manuale sono disegnati e sono intesi essere ‘volato' o
sospeso per la prestazione massima acustica usando una varietà di attrezzare di hardware,
i mezzi, ed i metodi. È essenziale che tutta il lavoro di installazione coinvolgendo la
sospensione di questi prodotti di altoparlante è eseguita da dalle persone competenti,
addestrate che capisce le pratiche di attrezzare di cassaforte. La lesione severe e/o la
perdita di vita possono accadere se questi prodotti sono erratamente installati. Per favore
di leggere la sezione di attrezzare per le ulteriori informazioni.
Español
Los altavoces descritos en este manual se diseñan y son pensados ser ‘volado' o suspendido
para el desempeño acústico máximo que utiliza una variedad de aparejar hardware, de
medios, y de los métodos. Es esencial que todo trabajo de la instalación que implique la
suspensión de estos productos del altavoz sea realizado por personas competentes y
entrenada que entienden aparejar seguro las prácticas. La herida y/o la pérdida severas de
la vida pueden ocurrir si estos productos se instalan impropiamente. Lea por favor la
sección a aparejar para la información adicional.

Community SONUS Series - Operation and Installation Manual - Page 7
SONUS SERIES
OPERATION MANUAL
INTRODUCTION
Thank you for selecting Community’s SONUS Series. SONUS is a family of affordable,
linear-response loudspeakers designed for use in applications requiring controlled coverage
patterns, high-impact power response, with clear and intelligible sonic output. All models
are designed with portability in mind, but they are equally effective in permanent or semi-
permanent installations.
The SONUS family of products is well suited for use in nightclubs, cafes, discotheques,
houses of worship, auditoriums, meeting rooms, theatres, outdoor concerts, and most
anywhere else that people gather to enjoy music and hear the spoken word.
SONUS loudspeakers are flexible, easy to set up and use, and most importantly they
provide superb sound quality.
This Operation Manual is intended to help you use SONUS loudspeakers effectively and
safely. It provides useful information to assist you in obtaining the best performance,
sound quality, and reliability from your SONUS products.
We’ve provided several easy-to-understand diagrams to enable you to operate your SONUS
speakers immediately if required; however, we recommend that you read the entire manual
to insure that your SONUS-powered shows, events, and installations meet the highest
possible standards.
SONUS FEATURES AND TECHNOLOGY
SONUS loudspeakers offer numerous features and advances in technology that provide
superb sound and long-term reliability. Some of these include:
•Sophisticated internal crossover networks for reduced off-axis lobing and consistent
coverage throughout the crossover region.
•Selectable crossover modes (bi-amped or passive single-amped).
•Carbon Ring Cone Technology; used on all full-range low-frequency drivers for
reduced distortion, enhanced transient response, and 30% greater cone area than
conventional cone drivers (patent pending).
•Ferrofluid-cooled high-frequency and mid-frequency drivers for improved heat
conductance and dramatically reduced distortion through viscous damping of driver
resonant modes.
•Music / Speech PRESENCE Switch re-voices the loudspeaker’s tonal balance for
increased articulation in the vocal range.
•Powerful 1-inch-throat high-frequency compression drivers offer extended high-end
response, smooth output, and lower distortion than larger format drivers.
•Non-metallic high-frequency diaphragms provide a further reduction in distortion
by eliminating the mechanical resonance normally associated with brittle metallic
materials.
•Geometrically correct, hand-laid fiberglass mid and high-frequency waveguides.

Community SONUS Series - Operation and Installation Manual - Page 8
•Community’s patented Cool-CoilTM heat evacuation technology minimizes cone
driver power compression and ensures long-term reliability (used in subwoofers).
•DYNA-TECHTM active protection circuitry aids in reducing the likelihood of damage
under abusive conditions.
•Switchable high-pass output on subwoofers maximizes performance when a full-
range system and a subwoofer are powered by a single amplifier channel.
•Rugged 11-ply cross-laminated Birch enclosures, coated with a two-part catalyzed
polyester paint for durability.
•Protective steel grilles covered with durable powder-coat finish.
•Load rated M10 fly points on tops, bottoms and rear of enclosures for safe & easy
rigging (note: M10 fly points are located on the end panels of the subwoofers).
•Dual NL4-compatible locking connectors, plus dual ¼” jacks allow easy connectivity
with readily available cables.
•Factory designed rigging hardware available from stock.
UNPACKING AND INSPECTION
SONUS loudspeakers are inherently rugged and are carefully packed in sturdy cartons.
However, it’s wise to thoroughly inspect each unit after it has been removed from the
packaging, as damage could occur during shipping.
Please note that once the shipment has left your dealer or the Community factory, the
responsibility for damage is always borne by the freight company. If damage has occurred
during shipping, you must file a claim directly with the freight company. It’s very important
to contact the freight company as soon as possible after receiving your shipment, as most
freight companies have a short time limit within which they will investigate claims. Make
sure to save the carton and the packing material, as most claims will be denied if these
materials are not retained. Your Community dealer and the factory will try to help in any
way they can, but it is the responsibility of the party receiving the shipment to file the
damage claim.
It’s always a good idea to retain the carton and packing materials indefinitely, if possible, in
the event that the unit may need to be returned to your dealer or distributor for repair in
the future.
Each shipping carton contains the following items:
•Loudspeaker System (Qty 1)
•Operation Manual (Qty 1)
•Warranty Card (Qty 1)
DANGER: SONUS rigging fittings are each rated at a Working Load Limit (WLL) of 100 lbs
(45.4kg) with a 10:1 safety margin. No single rigging fitting should ever be subjected to a
load that is greater than this stated limit. Failure to heed this warning could result in injury
or death!
IMPORTANT: The flat-head Allen-drive rigging screws that come installed in each
enclosure must either be replaced with rigging brackets and threaded fasteners, or they
must be kept in place to seal the enclosure from air leaks. If the rigging fittings do not
remain sealed, air leaks will occur in the enclosure that will compromise the low-frequency
performance with distortion and reduced output.

Community SONUS Series - Operation and Installation Manual - Page 9
SONUS Specifications
Due to ongoing development, specifications are subject to change without notice.
Note: *denotes half-space sensitivity.
Model SONUS-1296 SONUS-1596 SONUS-3294 SONUS-3594 SONUS-215S SONUS-218S
Loudspeaker Type Two-way, full-
range, vented
bass - switchable
passive or bi-amp
Two-way, full-
range, vented
bass - switchable
passive or bi-amp
Three-way, full-
range, vented
bass - switchable
passive or bi-amp
Three-way, full-
range, vented
bass - switchable
passive or bi-amp
Dual driver
subwoofer, vented
bass - switchable
hi-pass/parallel
output
Dual driver
subwoofer, vented
bass - switchable
hi-pass/parallel
output
LF: 1 x 12” LF: 1 x 15” LF: 1 x 12” LF: 1 x 15” LF: 2 x 15” LF: 2 x 18”
MF: 1 x 6.5” MF: 1 x 6.5”
Driver Complement
HF: 1 x 1” HF: 1 x 1” HF: 1 x 1” HF: 1 x 1”
Nominal Dispersion
(H x V) 90º x 60º 90º x 60º 90º x 40º 90º x 40º 360º x 180º 360º x 180º
Operating Range 60 Hz - 20 kHz 50 Hz - 20 kHz 60 Hz - 20 kHz 55 Hz - 20 kHz 30 Hz - 2 kHz 30 Hz - 1 kHz
Frequency Response 100 Hz - 16 kHz 90 Hz - 16 kHz 90 Hz - 16 kHz 80 Hz - 16 kHz 40 Hz - 200 Hz 40 Hz - 200 Hz
200W RMS (40V) 200W RMS (40V) 200W RMS (40V) 200WRMS (40V) 400W RMS (40V) 600W RMS (49V)
500W PGM 500W PGM 500W PGM 500W PGM 1000W PGM 1500W PGM
Max Input Ratings
(passive mode)
990W PEAK 990W PEAK 990W PEAK 990W PEAK 1980W PEAK 2970W PEAK
Sensitivity 1W/1m 99 dB SPL 102 dB SPL 100 dB SPL 101 dB SPL 97 dB SPL* 100 dB SPL*
Maximum SPL 122 dB cont.
129 dB peak 124 dB cont. 131 dB peak 123 dB cont. 130 dB peak 123 dB cont. 130 dB peak 120 dB cont. 127 dB peak 125 dB cont. 132 dB peak
Nominal Impedance 8 Ohms 8 Ohms 8 Ohms 8 Ohms 4 Ohms 4 Ohms
Input Connection Dual NL4 with
dual ¼” jacks in
parallel
Dual NL4 with
dual ¼” jacks in
parallel
Dual NL4 with
dual ¼” jacks in
parallel
Dual NL4 with
dual ¼” jacks in
parallel
Dual NL4 with
dual ¼” jacks in
parallel
Dual NL4 with
dual ¼” jacks in
parallel
Rigging Provisions Eight M10
threaded rigging
fittings - three
each on top and
bottom; two
on rear
Ten M10
threaded rigging
fittings - four
each on top and
bottom; two
on rear
Ten M10
threaded rigging
fittings - four
each on top and
bottom; two
on rear
Ten M10
threaded rigging
fittings - four
each on top and
bottom; two
on rear
Eight M10
threaded rigging
fittings - four on
each end of
enclosure
Four M10
threaded rigging
fittings - two on
each end of
enclosure
Construction 11 ply cross-
laminated birch 11 ply cross- laminated birch 11 ply cross- laminated birch 11 ply cross- laminated birch 11 ply cross- laminated birch 11 ply cross- laminated birch
Finish Black catalyzed
polyester two-
part paint
Black catalyzed
polyester two-
part paint
Black catalyzed
polyester two-
part paint
Black catalyzed
polyester two-
part paint
Black catalyzed
polyester two-part
paint
Black catalyzed
polyester two-part
paint
Dimensions H 23.9 in / 607mm 27.2 in / 691mm 29.3 in / 744mm 32.4 in / 823mm 18.4 in / 467mm 21.4 in / 544mm
(in / mm) W 14.9 in / 378mm 18.4 in / 467mm 17.4 in / 442mm 18.4 in / 467mm 37.4in / 950mm 44.4 in / 1128mm
D 13.4 in / 340mm 15.9 in / 404mm 15.4 in / 391mm 15.9 in / 404mm 20.4 in / 518mm 24 in / 610mm
Weight (lbs / kg) 36lbs / 16.3kg 46.5lbs / 21.1kg 53lbs / 24kg 58lbs / 26.3kg 89lbs / 40.4kg 127lbs / 57.6kg

Community SONUS Series - Operation and Installation Manual - Page 10
GETTING ACQUAINTED
Figure 1: Physical Features of Typical SONUS Full-Range Models
SONUS Full-Range Input Panel

Community SONUS Series - Operation and Installation Manual - Page 11
PHYSICAL FEATURES OF SONUS FULL-RANGE MODELS
FEATURE DESCRIPTION
TOP & BOTTOM RIGGING
POINTS 8 total, 4 top and 4 bottom - bottom points not shown1
(note: SONUS-1296 has 3 top and 3 bottom).
ERGO-GRIP SIDE LIFTING
HANDLES 2 total.
PROTECTIVE GRILLE Powder-coated steel grille protects drivers
from foreign objects.
GRILLE RETENTION
SCREWS Eight (or ten) #6 x 5/8” sheet metal screws, depending on model.
REAR ERGO-GRIP
LIFTING HANDLE 1 total.
REAR PULL-BACK POINTS Used for angling enclosure downward; not for primary
rigging.
INPUT PANEL For amplifier connection to the loudspeaker. Also
contains Bi-amp / Single-amp switch, Presence switch,
and DYNA-TECHTM Protection Indicator.
POLE SUPPORT
RECEPTACLE Installed on bottom of enclosure. Accepts standard loudspeaker support pole (1.375” / 35 mm diameter).
FEET 4 synthetic-rubber feet protect surfaces from marring.
PASSIVE / BI-AMP
SWITCH
Used to select loudspeaker’s operating mode. LEFT
position is for PASSIVE mode (single amplifier) and
RIGHT position is for BI-AMPLIFIED mode (separate
LF and HF amplifiers).
NL4-COMPATIBLE
LOCKING CONNECTORS
Two 4-pole NL4MP type loudspeaker connectors wired
in parallel. Accepts NL4FC connectors. Used for both
PASSIVE and BI-AMPLIFIED modes. Use terminals #1
+/– for PASSIVE mode or for BI-AMPLIFIED LF input.
Use terminals #2 +/– for BI-AMPLIFIED HF input (not
used in PASSIVE mode).
¼” JACKS
Wired in parallel with Pins #1+ and #1- of both NL4MP connectors. Note: may only be used in PASSIVE mode.
DYNA-TECHTM
PROTECTION INDICATOR
Red LED indicates that DYNA-TECH active protection
circuits have been engaged, reducing the potential of
driver damage.
PRESENCE SWITCH
Selects between MUSIC (Flat) and VOICE/ SPEECH
(+4dB) operating modes (LEFT position is MUSIC
(Flat), RIGHT is VOICE/SPEECH). Re-voices the
loudspeaker’s tonal balance for increased articulation
in the vocal range.
1100 lbs (45.4 kg) Working Load Limit / 10:1 safety factor

Community SONUS Series - Operation and Installation Manual - Page 12
Figure 2: Physical Features of Typical SONUS Subwoofers
(Note: the SONUS-215S Subwoofer is not equipped with wheels)
SONUS Subwoofer Input Panel

Community SONUS Series - Operation and Installation Manual - Page 13
PHYSICAL FEATURES OF SONUS SUBWOOFERS
FEATURE DESCRIPTION
LIFTING HANDLES 4 total; 2 on each end panel.
‘HANDTRUCK’ HANDLES 2 total. For tilting the enclosure onto its built-in transport
wheels (model 218S only).
RIGGING POINTS MODEL 218S: 4 total; 2 on each end panel2.
MODEL 215S: 8 total; 4 on each end panel3.
POLE SUPPORT
RECEPTACLE
Installed on top of enclosure. Accepts standard
loudspeaker support pole (1.375” / 35 mm diameter).
Receptacle is sleeved to the bottom of the enclosure for
maximum stability.
PROTECTIVE GRILLE Powder-coated steel protects drivers from foreign objects.
GRILLE RETENTION
SCREWS Twenty #6 x 5/8” sheet metal screws.
INTEGRATED TRANSPORT
WHEELS Dual permanently mounted rigid casters (non-swivel), for easy transport (model 218S only).
FEET 4 synthetic-rubber feet protect surfaces from marring.
INPUT PANEL For amplifier connection to the loudspeaker. Also contains
FLAT / HI-PASS Switch and DYNA-TECH protection
indicator.
NL4-COMPATIBLE
LOCKING CONNECTORS
4-pole NL4MP type loudspeaker connectors, wired in
parallel. Accepts NL4FC connectors.
Use terminals #1 +/–.
Terminals #2 +/– are wired in parallel with #1 +/-.
¼" JACKS
Permanently wired in parallel to Pins #1+ and #1- on the NL4 closest to the ¼" jack.
HIGH-PASS SWITCH
Selects between HI-PASS OUTPUT and PARALLEL INPUT
MODE on the speaker output connectors (up is HI-PASS,
down is PARALLEL). HI-PASS filter is 125 Hz, 6/dB per
octave with an 8Ωload (note: crossover frequency is load
dependent).
DYNA-TECH PROTECTION INDICATOR
Red LED indicates that DYNA-TECH active protection
circuits have been engaged, reducing the potential of
driver damage.
2100 lbs (45.4 kg) Working Load Limit / 10:1 safety factor
3100 lbs (45.4 kg) Working Load Limit / 10:1 safety factor

Community SONUS Series - Operation and Installation Manual - Page 14
GENERAL DESCRIPTION
SONUS Series loudspeakers are designed for demanding day-to-day use in a wide range of
both portable applications and fixed installations. Their high quality driver components are
housed in rugged, acoustically inert enclosures fitted with convenient carrying handles,
rigging fittings, and support stand receptacles. SONUS systems are characterized by a
high-power, low distortion linear response that provides exceptional musicality and speech
intelligibility.
The SONUS line consists of six models:
•SONUS-1296 - a 12” / 1” two-way, in a multi-angle enclosure suitable for
FOH or Stage Monitoring.
•SONUS-3294 - a 12” / 1” three-way which includes the addition of a horn-
loaded 6.5” cone driver, in a trapezoidal enclosure.
•SONUS-1596 - a 15” / 1” two-way, in a trapezoidal enclosure.
•SONUS-3594 - a 15” / 1” three-way which includes the addition of a horn-
loaded 6.5” cone driver, in a trapezoidal enclosure.
•SONUS-215S - a dual 15” subwoofer, in a rectangular enclosure.
•SONUS-218S - a dual 18” subwoofer, in a rectangular enclosure with
integrated casters.
Note: All models have integrated support stand fittings.
When used in multiples, SONUS loudspeakers array well. Systems may be designed around
horizontal splayed arrays, vertical splayed arrays, as well as exploded clusters and
distributed configurations. Rigging kits are available from the factory as standard items
(see the section on Rigging Hardware on page 46).
The specifications table on page 9 depicts dimensions, weights and general specifications of
the various SONUS models.
DNYA-TECH DRIVER PROTECTION SYSTEM
All SONUS Series loudspeakers employ Community’s advanced technology DYNA-TECH
driver protection system. Functioning as a multi-stage limiter, DYNA-TECH circuitry
provides precise and repeatable protection by reducing excessive power to the drivers
under abusive conditions.
The first stage of limiting is designed to protect against short-term excess power applied to
the high-frequency driver(s) in the system. This circuit utilizes an HPCCR (High Positive
Current Coefficient Resistor) in series with the driver(s). The HPCCR increases resistance
as the current flowing through it increases. As its resistance rises above nominal, the
heating of the element provides RMS conversion. The result is an RMS limiter with a ratio
that varies according to the demands of the program material.
The second stage of limiting protects against excessive power levels to all drivers in the
system. This stage is based on a relay driven through a voltage sensing circuit. The relay
engages at a pre-determined voltage, corresponding to a power level that would otherwise
cause driver damage. When engaged, the relay introduces a bank of high-wattage resistors
in series with the drivers. These resistors cause a voltage drop to the drivers, thereby
reducing the power applied to them. A red LED on the rear panel indicates that this
protection circuit has been engaged.
When the relay protection circuit is activated, there will be a noticeable drop in the system’s
level (approximately 3 to 4 dB). The red LED, as well as the drop in level, serves as a
warning to the operator that the loudspeaker is being overdriven. When this stage of

Community SONUS Series - Operation and Installation Manual - Page 15
protection is engaged, the level of console and/or amplifier output to the system
should be reduced.
IMPORTANT: If the operator continues to run the system at excessive levels, or worse, if
the operator raises the drive level to compensate for the drop in output caused by the
protection circuitry, eventually an additional stage of protection will engage that shuts down
the system entirely (note that this additional stage of protection will never engage until
after the second stage has been triggered). If the system shuts down entirely, the operator
can immediately restore sound by merely reducing the drive level to the system.
Advantages of Community’s DYNA-TECH Circuitry
There are numerous advantages to this type of multi-stage protection circuitry. The trip
point is pre-set to engage at exactly the same time on all speakers that are powered from
the same amplifier. The initial stages of DYNA-TECH protection circuitry do not rely on, and
are not affected by heat build-up. Some manufacturers use circuit breakers that require
heat build-up before they trip; this limits their ability to protect a cold speaker. The trip
points of such breakers are also affected by ambient temperature, their own internal
heating curves, and small variations in speaker impedance or crossover component
tolerances, all of which can cause unpredictable behavior.
Because the first and second stages of Community’s DYNA-TECH circuits are not thermally
sensitive, they react nearly instantaneously to protect against excessive increases in level.
Moreover, the protection disengages almost immediately when the level is reduced; it is not
necessary to wait for a circuit breaker to cool down. This means that your loudspeaker can
operate at its full dynamic range and still react quickly to excessive musical peaks, without
fear of damaging the system. It also means that your loudspeaker is protected from the
moment the power amplifier is plugged in and turned on, regardless of the ambient
temperature.
As mentioned above, the protection circuitry provides an additional level of protection for
the entire loudspeaker to guard it from severe misuse. If the system is operated in the
second-stage protection mode for a long period of time, or if the input level is increased by
someone trying to overcome the volume drop from the second-stage protection circuit, a
solid-state circuit breaker will trip and remove all signal from the loudspeaker until the
input level is reduced. Because this circuit breaker is heat sensitive, it provides a final level
of protection that takes heat into account as well as power. However, unlike most
implementations of circuit breakers that take time to cool down before resetting, DYNA-
TECH circuits respond instantly to a reduction in level, restoring the system to its full
dynamic range without needing to wait for the circuit breaker to reset itself.
HIGH-FREQUENCY PRESENCE SWITCH
Each SONUS full-range loudspeaker is equipped with a Presence Switch on its rear input
panel. This switch selects between two different high-frequency contours to adjust the
voicing of the loudspeaker. Using the Presence Switch allows you to optimize the audio
quality for different performers, for varying types of program material, and for differing
acoustical environments.
One position of the Presence Switch is labeled MUSIC (FLAT) while the other position is
labeled VOICE-SPEECH (+4dB). In the MUSIC (Flat) position, the response of the
system is essentially flat; in other words it will exhibit no significant variation in amplitude
throughout its operating range. In the VOICE-SPEECH (+4dB) position, the mid band
between approximately 2 – 4.5 kHz is accentuated by approximately +4dB for increased
articulation in the vocal range, with less accentuation extending from approximately 1 kHz
to 8 kHz.

Community SONUS Series - Operation and Installation Manual - Page 16
Figure 3: Graph Depicting Frequency Response of MUSIC / VOICE
Presence Switch (Note: the Voice/Speech position is represented by the dotted line)
70
80
90
100
110
10 100 1,000 10,000 100,000
Resolution <500 Hz = 10 Hz, >500 Hz = 40 Hz, 1/2 octave smoothing
C-TIP: The VOICE-SPEECH (+4dB) position may be useful when trying to compensate for
absorption loss over very long distances, or just when some additional presence is needed
to achieve the tonal quality you’re seeking. Note: This switch is active in both the PASSIVE
and BI-AMP modes.
SELECTABLE HIGH-PASS OUTPUT ON SUBWOOFERS
SONUS subwoofers are equipped with an industry-standard NL4-compatible locking
connector wired in parallel with a ¼” jack. A second NL4-compatible locking connector is
provided, also wired in parallel to a ¼” jack. This second set of connectors is intended as
OUTPUTS and are associated with the subwoofer’s SWITCHABLE HIGH-PASS OUTPUT.
When the selector switch is set to the PARALLEL INPUT MODE (the down position), both
the NL4-compatible locking connector and the 1/4” jack function exactly as loop-thru
connectors; in other words they are simply wired in parallel with the INPUT
CONNECTORS.
Conversely, when the selector switch is set to HIGH-PASS OUTPUT (the up position), a 1st
order high-pass filter (6 dB per octave) is inserted into the circuit. The filter has a corner
frequency of 125 Hz with an 8 ohm load.
Using the HIGH-PASS OUTPUT MODE inserts the HIGH-PASS FILTER as mentioned above,
but it also presents a higher impedance load to the amplifier. This can become quite
important, particularly if a pair of full-range loudspeakers and a subwoofer are being
powered from a single amplifier channel. In the PARALLEL INPUT MODE, the impedance of
the combined load could become dangerously low for some amplifiers, potentially causing
the amplifier to shutdown or fail.
The following graph shows the difference in the total load impedance with the high-pass
switch in the HIGH-PASS and PARALLEL INPUT MODE positions. The lower line depicts the
response with the switch in the FLAT position where the load drops below 2 ohms between
30 – 50 Hz and again between 100 – 200 Hz, potentially causing early clipping, amplifier
shutdown, or even amplifier failure. The upper line depicts the response with the switch in
the HIGH-PASS position, where the load impedance has been increased by about 50% by
the subwoofer’s internal crossover circuit, thereby protecting the amplifier from premature
clipping and potential failure.
Frequency in Hertz
dB
SPL

Community SONUS Series - Operation and Installation Manual - Page 17
Figure 4: Graph Depicting Response of HIGH-PASS / FLAT Switch
(Note: upper line depicts HIGH-PASS; lower line depicts FLAT)
In addition to presenting a more amplifier-friendly load, the HIGH-PASS OUTPUT also
attenuates the low-frequency energy that’s fed to the full-range loudspeaker. This reduces
the demand on the full-range loudspeaker’s woofer, thereby freeing up some additional
power and headroom in the upper part of the bass spectrum. Use of the HIGH-PASS
OUTPUT will typically result in an overall flatter response, but with slightly less total power
available in the mid-bass portion of the audio spectrum.
The results you achieve will be strongly influenced by the relative locations of the full-range
loudspeaker(s) and the subwoofer(s), their position in relation to the walls, floor or ceiling,
as well as the overall room acoustics. For example, if a full-range model is stacked on a
subwoofer, the combined response will be different than if it is flown 15 or 20 feet over the
subwoofer. We encourage you to experiment to obtain the quality of sound that is to your
liking.
IMPORTANT: The corner frequency of the HIGH-PASS FILTER is load dependent (this is
the case with all passive filters). This means that the frequency will alter if the impedance
of the load changes. For example, if two 8 ohm full-range enclosures are connected to the
high-pass output in parallel, the resultant 4 ohm load will change the high-pass corner
frequency to 250 Hz.
C-TIP: For exact control in balancing the relative levels of the subwoofer(s) and the full-
range loudspeaker(s), we recommend that separate amplifier channels be employed to
power each unit individually. Moreover, if an electronic active crossover is used to divide
the signal to the subwoofer(s) and the full-range loudspeaker(s), this will result in bi-
amping the two systems. Bi-amping provides the benefit of reducing the overall power
demand on each amplifier channel while reducing intermodulation distortion.
FLAT position
HIGH-PASS position

Community SONUS Series - Operation and Installation Manual - Page 18
COOL-COIL™ TECHNOLOGY
The cone drivers used in the SONUS subwoofers utilize Community’s patented Cool-Coil™
heat evacuation technology. A proprietary process, Cool-Coil employs an airflow director to
remove heat from the voice coil, thereby increasing both the performance and reliability of
the cone drivers. In particular, the effect of Power Compression is significantly improved by
Cool-Coil technology. Power Compression occurs when drivers respond non-linearly to
applied power, producing less and less output as their voice coils heat up and their
impedance rises.
High voice coil temperatures have other undesirable effects on performance. Most materials
used in drivers, particularly adhesives and insulation, suffer some diminished properties
under extremes of heat. Thermal expansion can result in warpage and misalignment of
components. A voice coil in which the diameter has increased due to thermal expansion
will often no longer be round, and certainly has a greater possibility of rubbing against the
magnetic structure.
Any amount of cooling that can be applied to a woofer will be beneficial. One very
commonly used cooling method is venting of the pole piece of the magnet structure. The
motion of the cone assembly will pump air in and out of the cavity under the dust cap. This
air passing through the pole vent helps to cool the magnet structure. Community has
improved on this common cooling method by introducing an airflow director (US patent
6,390,231) into the air path. Figure 5 shows a conventional woofer motor with a vented
pole piece, and also a similar motor with the addition of an airflow director. The voice coil
former in the airflow motor is aluminum, and is taller than normal. This extended
aluminum former becomes a cooling fin for the voice coil, and the airflow director causes
the air to pass in close proximity to the former. By directing the air to flow over the hot
aluminum former, more heat is removed from the voice coil than simply allowing the
pumped air to take its natural path in and out of the cavity. This results in woofers that can
handle higher power with greater reliability than those of conventional design.
Figure 5: Community’s Cool-Coil™ Heat Evacuation System
OPERATING IN PASSIVE OR BI-AMPED MODE
All SONUS full-range loudspeaker models may be operated in either the passive mode or
the bi-amped mode.
A switch on the full-range loudspeaker input panel selects between the two operating
modes: PASSIVE mode (single amplifier) or BI-AMP mode (separate low and high frequency
amplifiers). In both PASSIVE and BIAMP mode, the internal crossover divides the audio
signal into the separate frequency ranges for each of the drivers.

Community SONUS Series - Operation and Installation Manual - Page 19
In PASSIVE mode one amplifier is used to power the entire loudspeaker. In BI-AMP mode
one amplifier is used to power the low frequency section and another is used to power the
high frequency section. The separation of high and low frequencies is done internally in the
loudspeaker, so no electronic crossover is required. Simply run full-range signals into the
amplifiers and connect the outputs to the appropriate HF and LF terminals on one of the
Neutrik input jacks. Use the amplifier input level controls to balance the HF to LF acoustic
outputs.
Alternatively, an electronic crossover can be used before the amplifiers in the signal chain
to optimize the bandwidth of audio supplied to the amplifiers. This would prevent, for
example, the high-frequency amplifier from being burdened with full-range (including low
frequency) content. Use of an electronic crossover can be helpful but is not necessary.
CAUTION: A system set up for either the passive or bi-amp mode of operation should
never be switched to the opposite mode without first appropriately re-wiring the system!
Damage to the high-frequency driver could readily occur. At best, the system will not
sound or perform properly. Make sure to always disconnect the amplifier and re-
configure the wiring before changing from one mode of operation to the other.
C-TIP: Bi-amping will almost always result in cleaner, more faithful reproduction of the
program content, particularly noticeable at high levels or when reproducing complex, full-
range material. If the budget permits, we recommend bi-amping as the best solution.
HIGH-PASS FILTERS
When operating in either the passive or the bi-amplified mode, we strongly recommend the
use of an external, active high-pass filter to protect the cone drivers from excessive low-
frequency excursion. High-pass filters will eliminate the potential of low-frequency
modulation from wind noise, turntable rumble, stage vibration, and other causes that result
in a poorly defined and ‘muddy’ bass response. Additionally, a high-pass filter will avoid
wasting amplifier power by stopping the amplifier from attempting to reproduce frequencies
below the loudspeaker’s intended operating range.
The table below shows the recommended filter settings:
Model High-Pass Filter
SONUS-1296 Full-Range: 60 Hz, 24db/octave
SONUS-1596 Full-Range: 50 Hz, 24db/octave
SONUS-3294 Full-Range: 60 Hz, 24db/octave
SONUS-3594 Full-Range: 55 Hz, 24dB/octave
SONUS-215S Subwoofer: 30 Hz, 24db/octave
SONUS-218S Subwoofer: 30 Hz, 24db/octave
CHOOSING ACTIVE CROSSOVERS
A wide variety of active crossovers and loudspeaker control systems are available from
numerous manufacturers. Most of today’s products use DSP (Digital Signal Processing) to
divide the frequency bands and provide equalization, protective limiting, and signal delay.
The use of a good quality DSP processor or ‘loudspeaker management tool’ as many such
devices are often referred to, is strongly encouraged. When properly utilized, a DSP
processor provides numerous benefits that contribute to better quality sound and longer
system life. Please contact Community or your Community dealer for up-to-date
recommendations regarding specific types and models of available DSP products.

Community SONUS Series - Operation and Installation Manual - Page 20
USING PROTECTIVE LIMITERS
Although SONUS loudspeaker systems are well protected against potentially abusive
operating conditions by their internal DYNA-TECH protection circuits, the use of an active,
outboard limiter can add an extra measure of insurance for long-term reliability.
Additionally, an active outboard limiter can be adjusted to provide a subtler degree of driver
protection, precisely tailored to each user’s specific needs in terms of musical styles and
operating conditions.
A limiter is a device that detects the level of the signal that it’s receiving over a given
interval or “time constant.” When the input level crosses a certain threshold, for longer
than a certain time period, the limiter introduces some degree of gain reduction. In turn,
the gain reduction reduces the dynamic range of the program material that reaches the
amplifier.
Limiters, and their close cousin Compressors, are used in music recording and sound
reinforcement to create certain effects such as perpetual sustain of guitar and bass notes.
They’re also widely used to reduce or eliminate peak levels from vocalists, percussionists,
and other dynamic sources, as well as often being employed to avoid overdriving amplifiers
and speakers.
Limiters that are suitable for protecting loudspeaker systems are available as stand-alone
products, as well as often being included as a function of many DSP based loudspeaker
controllers or ‘loudspeaker management systems.’
Limiters typically allow adjustment of some or all of the following parameters:
•Threshold
•Input Level
•Output Level (frequently called ‘makeup gain’)
•Attack Time
•Release Time
•Compression Ratio
Virtually all limiters allow the user to set the threshold, or level, at which point gain
reduction will occur. Most models also permit the user to adjust the limit ‘ratio.’ Ratio
refers to the magnitude of gain reduction. At a 2:1 ratio, every 2 dB increase in input level
above the threshold will result in a 1 dB increase in output. At a 10:1 ratio, every 10 dB
increase in level above the threshold will also result in a 1 dB increase in output. From
these two examples, you can readily see how the Ratio control settings will affect the
dynamic range.
Incidentally, the term ‘limiting’ generally refers to ratios of 10:1 or higher (some say 20:1),
whereas ‘compression’ is the term used for lower ratios, such as 2:1 or 4:1. In fact, the
only distinction between ‘compression’ and ‘limiting’ is the ratio of gain reduction.
Many limiters will allow the user to set the time constant that determine the length of the
transients that are permitted to pass before the limiting function engages (this is called
Attack), as well as the time span in which the limiter will ‘recover,’ or return to a state of
non-limiting (called Release).
When used to protect a loudspeaker system, the limiter should be set so that gain reduction
engages at some point before damage occurs to the drivers. If the threshold is set too low,
the resultant sound quality will be ‘squashed.’ In other words, the dynamic range of the
program material will be reduced to a degree that is audibly unpleasant. Conversely, if the
threshold is set too high, the limiter will not engage early enough to protect the
loudspeaker system from damage.
It is very difficult to suggest exact limiter settings, because the ideal setting for one system
and one style of music may be undesirable for another system or another style of music.
Coupled with this, the dynamic response characteristics of the amplifier(s) used in the
system also play a large role in determining proper limiter adjustments. Amplifiers differ
from one make and model to another in their dynamic headroom capability, sometimes
greatly, and also in how they behave when they clip (see section on Amplifier Clipping on
page 30 for more information on driver damage caused by clipping.) Because of this, we
can offer only general guidelines on how to set up your system.