STM NEXO M28 User manual

DP7153-01-DI
M28 / M28-I
User manual

TABLE OF CONTENTS
Page 2/ 28 STM-M28 / M28-I
TABLE OF CONTENTS
TABLE OF CONTENTS___________________________________________________________________ 2
WARNINGS ____________________________________________________________________________ 3
EQUIPMENT ___________________________________________________________________________ 4
DESCRIPTION__________________________________________________________________________ 5
PRESET_______________________________________________________________________________ 6
HF DIRECTIVITY________________________________________________________________________ 9
CROSSOVER FREQUENCY______________________________________________________________ 10
ACCESSORIES ________________________________________________________________________ 13
ARRAY EQ____________________________________________________________________________ 21
MAINTENANCE________________________________________________________________________ 22
TECHNICAL SPECIFICATIONS ___________________________________________________________ 26
USER NOTES _________________________________________________________________________ 27
EU Conformity declaration
We,
NEXO SA
ZA DU PRE DE LA DAME JEANNE
60128 PLAILLY –France
Declare under our sole responsibility that the product
Type
Serial number
Loudspeaker
M28 / M28-I
On the product
Is in conformity with the provisions of the following directive
including all applicable amendments:
2014/35/UE (Low Voltage Directive)
Applied rules and standards:
Plailly, June, 2014
EN 12100, EN 13155, EN 62368
Joseph CARCOPINO, R&D Director

WARNINGS
STM-M28 / M28-I Page 3/ 28
WARNINGS
PRECAUTIONS
-repairable part.
If the system seems to be malfunctioning or damaged, stop using it at once and have it repaired by a NEXO qualified technician.
Do not expose the system directly to the sun or to the rain, do not immerse it into fluids, do not place objects filled with liquid on the system. If a
liquid gets into the system, please have it inspected by a NEXO qualified technician.
When flying outdoor systems ensure that the system is not exposed to excessive wind or snow loads and is protected from rainfall.
In case of wind greater than 8 on Beaufort scale (72km/h 45mph), a touring system has to be landed or an additional securing has to be
implanted.
For fixed installations, wind loading has to be taken into account in accordance to the national standards
The connection should be performed by qualified technician, by ensuring that power is off.
Operating temperature with temperate climate: 0°C to +40°C (+32°F to +104); -20°C à +60°C (-4°F to +140°F) for storage.
SAFETY INFORMATIONS
Read this manual before using the speaker.
Keep this manual available for further reference.
Observe all warnings and cautions.
Please check the NEXO Web site nexo-sa.com to get the most up-to-date version of this manual.
Ensure you are aware of the safety rules applying to rigging, stacking or installing on tripod or speaker stand. Failure to observe these rules may
expose persons to potential wounds or even death.
Only use the system with accessories specified by NEXO.
Please always consult a NEXO-accredited technician if the installation needs architectural works and observe following precautions:
Mounting Precautions:
- Please select screws and mounting location supporting 4 times the system weight.
- Do not expose the system to excessive dust, vibrations, to extreme cold or hot temperatures, to reduce the risk of damaging components.
- Do not place the system in an unstable position: it could fall accidentally.
- Do
not move the tripod with the system in position.
Connection and Powering Precautions:
- Unplug connected cables before moving the system.
- Power off the system before connecting the system.
- When switching on the installation, the amplifier must be powered last; when switching the installation off, shut off the amplifier first.
- If you work by cold temperatures, progressively raise the level to nominal value during the first minutes of use, to allow the system
components to stabilize.
Please check regularly the system condition.
HIGH SOUND PRESSURE LEVELS
Exposure to very high sound pressure levels may cause permanent hearing losses. Degrees of hearing losses may be different from one person to
another, but almost everybody will be affected if exposed to high sound pressure levels during a long period of time. The OSHA (Occupational
Safety and Health Administration) American Agency specified the following maximal exposures:
Number of Hours
Sound Pressure Level (dBA),
Slow Response
8
90
6
92
4
95
3
97
2
100
1 ½
102
1
105
½
110
¼ or less
115
WASTE OF ELECTRIC OR ELECTRONIC EQUIPMENT
This symbol on the product or its packaging indicates that this product must not be treated as household waste. Instead, it is
your responsibility to hand it over to a designated collection point for the recycling of waste electrical and electronic equipment.
By ensuring your waste equipment is recycled, you will help prevent potential negative consequences for the environment and
human health, which could appear if this product was not recycled. Recycling helps spare natural resources. For more
information about the recycling of this product, please contact your local city office, your household waste disposal service or
your reseller.

EQUIPMENT
Page 4/ 28 STM-M28 / M28-I
EQUIPMENT
M28
REDLockTM handle locks front rigging points from rear of cabinet.
CompassRigTM allows pre-setting of inter-cabinet angle value between M28 modules, from 0.2° to 15°.
M28-I
RIGAV Fix, front rigging points
CompassRigTM Fix (STI-M28CMP) allows pre-setting of inter-cabinet angle value between M28 modules, from 0.2° to 15°.

DESCRIPTION
STM-M28 / M28-I Page 5/ 28
DESCRIPTION
→The M28 is a compact full-range 2 ways speaker.
→M28 can be used alone or with STM-M46, STM-B112, STM-S118, MSUB18
→Versions:
•STM-M28-120: Touring application, 120° horizontal coverage
•STM-M28-90: Touring application, 90° horizontal coverage
•STM-M28-120-I: Fix installation, 120° horizontal coverage
•STM-M28-90-I: Fix installation, 90° horizontal coverage
→The speaker is equipped with two Speakon NL4 connectors, with parallel-wired pins.
•LF (1+/1-) Red/Black
•HF (2+/2-) Orange/Grey
→IP54 with STI-IPCOV28.
→Amplification
•The M28 speakers must be used with a NEXO processor to handle EQ, phase alignment, crossover and
excursion/thermal protection for the system loudspeaker.
•The following table shows the number of M28 speakers and S118 or MSB18 subwoofers usable with each solution.
NXAMP4x1MK2 (bridged)
NXAMP4x2MK2
NXAMP4x4MK2
M28
3 in parallel on 2 channels
S118
3 in parallel on 2 channels
MSUB18
1 per channel
1 per channel
Up to 2 per channel
Recommended

PRESET
Page 6/ 28 STM-M28 / M28-I
PRESET
Please consult nexo-sa.com for NEXO TD Controllers firmware information.
For M28, the following setups are available:
•Preset HF Main for 1x M28, 900 Hz 20 kHz.
•Preset HF Main for 2 or 3 M28, 900 Hz 20 kHz.
•Preset HF Main for 4 to 6 M28, 900 Hz 20 kHz.
•Preset HF Main for more than 6 M28, 900 Hz 20 kHz.
•Preset LF Main, 60 Hz 900 Hz.
•Preset LF Main, 85 Hz 900 Hz.
•Preset LF Main, 120 Hz 900 Hz.
•Preset LF Main, 180 Hz 900 Hz.
•Preset HF Downfil, 900 Hz 20 kHz.
•Preset LF Downfil, 120 Hz 900 Hz.
•Preset LF Downfil, 180 Hz 900 Hz.
M28

PRESET
STM-M28 / M28-I Page 7/ 28
M28 + B112
M28 + S118

PRESET
Page 8/ 28 STM-M28 / M28-I
M28 + MSUB18

HF DIRECTIVITY
STM-M28 / M28-I Page 9/ 28
HF DIRECTIVITY
It is possible to change the horizontal HF directivity of M28
120° to 90° with STT-FLG28090




CROSSOVER FREQUENCY
Page 10 / 28 STM-M28 / M28-I
90° to 120° with STT-FLG28120



CROSSOVER FREQUENCY
→60 Hz: Full range application.
→85, 120, 180 Hz: Use with MSUB18 / S118.

RIGGING ASSEMBLY
STM-M28 / M28-I Page 11 / 28
RIGGING ASSEMBLY
M28 TOURING
Angle pre-setting
Set speaker angles as specified from NS-1 Sofware by
inserting pin in CompassRig in appropriate hole
Front locking
Lower upper assembly into position, Align side rigging
slots on both sides of the cabinets.
Connect upper M28 to the second M28 by pushing
REDLockTM 
Ensure REDLockTM safety pin is locked into handle hole.
Rear locking
Lock CompassRigTM to the lower M28 by inserting the
quick release pins.
IMPORTANT
Side locking pins must be flush to rigging plates on both sides of the cabinet.
If locking pins appear to be going inwards in relation to rigging plates, cabinets must not be flown.
Ensure all REDLockTM safety pins are locked into handle holes.
Check rear quick release pins are fully engageg and locked.

RIGGING ASSEMBLY
Page 12 / 28 STM-M28 / M28-I
M28-I
To assemble the front rigging points, use the parts supplied with the M28-I
Assemble the parts on one side of the link bar.
Connect both cabinets by inserting the link bar through the front
holes.
Place the sleeve, tighten the nut.
Place the safety pin by bending it legs
Place the Compass on the upper M28-I using the D10x80 screw,
the spacer and lock with the M8 nut.
Attach the Compass to the bottom M28-I, using the D12x80
screw and secure with the M10 nut.
Adjust the appropriate angle by using D10x25, secure with nut M8
0.2°
0.8°
2°
4°
8°
10°
12.5°
15°

ACCESSORIES
STM-M28 / M28-I Page 13 / 28
ACCESSORIES
WARNINGS
All accessories are specifically rated in agreement with structural computations.
Never use other accessories when assembling M28 cabinets than the ones provided by NEXO: NEXO will decline
responsibility if any component is purchased from different supplier.
PROHIBITED: M28 below M28 without dedicated accessory
FLYING HARDWARE
STI-M28CMP
M28-I Rigging Compass.
Place the Compass on the upper
M28-I using the D10x80 screw, the
spacer and lock with the M8 nut.
Then attach the Compass to the
bottom M28-I, using the D12x80
screw and secure with the M10 nut.
Refer to the Product Data Sheet
STT-LBUMPM28
(9x M28 max)
Single bumper M28.
Insert LBUMPM28 into the 3 fixing points : 2
on the sides and one at the back of M28.
Lock the lateral springs pins inside the
LBUMPM28.
Insert the quick release pin at the back.
Lift the assembly.
.
Refer to the Product Data Sheet

ACCESSORIES
Page 14 / 28 STM-M28 / M28-I
VNT-TCBRK3551
With STT-LBUMPM28 (500kg max)
Rotary Truss Clamp.
Refer to the Product Data Sheet
STT-XBOW
(max 1700kg)
Limited to 18x M28
Single column top rigging.
Insert XBOW into the 3 fixing points: 2 on
the sides and one at the back of the M28.
Lock the lateral spring pins located inside
the XBOW to the front lateral holes of the
M28.
Insert the quick release pin at the back, in
the hole located at the back of the M28.
(D10x80 + nut for M28-I).
Refer to the Product Data Sheet
STT-KBEAM
(max 1700kg)
Limited to 18x M28
Kelping Beam
Place KBEAM on XBOW.
Insert the steel pin and insert the safety pin,
rotate its ring to lock safety.
Refer to the Product Data Sheet

ACCESSORIES
STM-M28 / M28-I Page 15 / 28
STT-MLINK
(max 1700kg)
Limited to 18x M28
Center motor rig point
Place MLINK on XBOW.
Insert the steel pin and insert the safety pin,
rotate its ring to lock safety.
Refer to the Product Data Sheet
STT-PTILT
(max 1700kg)
Limited to 18x M28
Front/Rear motor rig point
Place PTILT on XBOW.
Insert the steel pin and insert the safety pin,
rotate its ring to lock safety.
Refer to the Product Data Sheet
STT-VBUMP
(12x M28 max)
Tilt beam 1 rigging point
Negative Tilt
Positive Tilt
Place VBUMP on XBOW
Insert the steel pin and insert the safety
pin, rotate its ring to lock safety.
Refer to the Product Data Sheet

ACCESSORIES
Page 16 / 28 STM-M28 / M28-I
STT-DPLATE
Delta plate for horizontal aiming
Dividing Forces
Azimuth Mode
Refer to the Product Data Sheet
STT-BTBUMPER
Single column bottom rigging
Align BTBUMPER to bottom cabinet side
rigging slots and lock the BTBUMPER to
bottom cabinet by pushing RedLockTM.
(use RIGAVFIX for M28-I)
M28:
Lock CompassRigTM to BTBUMPER
connection point and insert the quick
release pin.
Lift BTBUMPER so that it is adjacent to
bottom cabinet and lock them with the quick
release pin into BTBUMP hole.
Refer to the Product Data Sheet
GTT-BCCH / STT-BCCH3
Compression chain 2 Tons
Compression chain3 Tons
Refer to the Product Data Sheet

ACCESSORIES
STM-M28 / M28-I Page 17 / 28
VXT-BRIDLE23
2 Legs Chain Bridle, 3 Tons.
Refer to the Product Data Sheet
VXT-LEVA750 / VXT-LEVA1500
Chain Lever Hoist 750 kg
Chain Lever Hoist 1.5 Ton
Refer to the Product Data Sheet
VXT-LIS-REC
Laser Inclinometer Set.
Insert the assembly, push forward until it
locks.
Refer to the Product Data Sheet

ACCESSORIES
Page 18 / 28 STM-M28 / M28-I
STACKING
STT-GSTK
(9x M28 max)
Stabilizer for STM Dolly.
Refer to the Product Data Sheet
ACCESSORIES
STI-IPCOV28
Waterproof Housing for STM-M28.
Refer to the Product Data Sheet
STT-FLG28090/28120
Flange 90° M28.
Flange 120° M28.
Refer to the Product Data Sheet

ACCESSORIES
STM-M28 / M28-I Page 19 / 28
TRANSPORT ACCESSORIES
STT-DOLLY01/02
Single Dolly with STT-GSTK
Double Dolly
Refer to the Product Data Sheet
STT-DROOF
Dolly roof
Refer to the Product Data Sheet
STT-DCOVER2812
Cover 2x 6M28 on Dolly02
Refer to the Product Data Sheet

ACCESSORIES
Page 20 / 28 STM-M28 / M28-I
STT-DOLLYKIT28
M28 Adapter Dolly STM
Lock the CompassRigTM before.
Use the back and side guides to position
the cabinets .
Lock cabinet on the dolly with
RedLockTM.
Pull upwards the red latch and at the
same time, pull the RedLockTM back to
Unlock
Refer to the Product Data Sheet
STT-DOLLY28
Dolly 3x M28
Lock the CompassRigTM before
.
Use the back and side guides to position
the cabinets .
Lock cabinet on the dolly with
RedLockTM.
Pull upwards the red latch and at the
same time, pull the RedLockTM back to
Unlock
Refer to the Product Data Sheet
STT-DCOVER283
Cover 3x M28 on Dolly28
Refer to the Product Data Sheet