Alto Professional Stealth Wireless User manual

User Guide
English ( 3 – 8 )
Guía del usuario
Español ( 9 – 14 )
Guide d'utilisation
Français ( 15 – 20 )
Guida per l'uso
Italiano ( 21 – 26 )
Benutzerhandbuch
Deutsch ( 27 – 32 )
Gebruikershandleiding
Nederlands ( 33 – 38 )
Appendix
English ( 39 )

2

3
User Guide (English)
Introduction
Thank you for purchasing the Alto Professional Stealth Wireless system. Stealth Wireless is a
convenient way to carry an audio signal from the main mixing and listening location to your powered
loudspeakers. Compatible with any active loudspeaker, this system can be used to simplify a new
installation or to retrofit an existing sound system. Welcome to the sound of wireless freedom.
Features:
•Wireless audio connectivity to active loudspeakers
•Replaces up to 200' of console-to-system cabling
•No compromise in audio quality
•Reliable UHF band; 16 selectable channels
•Adjustable squelch eliminates interference
•Dual-channel transmitter: two XLR-1/4" combo inputs
•Single-channel receivers: XLR output
•Grow your system using the Stealth Expander Pack (sold separately)
Box Contents
•Stealth Wireless Transmitter (x1)
•Stealth Wireless Receiver (x2)
•Hook and Loop Strips (for receivers)
•M10 Screws (x2)
•Machine Screws (x2)
•Power Adapters (x3)
•User Guide
•Safety & Warranty Manual
Support
For complete system requirements, compatibility information, and product registration, visit the Alto
Professional website: altoprofessional.com.
For additional product support, visit altoprofessional.com/support.
Important
CAUTION! Permanent hearing loss may be caused by exposure to extremely high noise levels. The
U.S. Government's Occupational Safety and Health Administration (OSHA) has specified permissible
exposures to certain noise levels.
According to OSHA, exposure to high sound pressure levels (SPL) in excess of these limits may result
in hearing loss. When using equipment capable of generating high SPL, use hearing protection while
such equipment is under operation. The table below defines exposure for a given duration.
HOURS PER DAY SPL EXAMPLE
890 Small gig
692 Train
495 Subway train
397 High level desktop monitors
2100 Classical music concert
1.5 102 Riveting machine
1105 Machine factory
.50 110 Airport
.25 or less 115 Rock concert

4
Transmitter Features
Rear Panel
1. Antennas – Place the antennas in a vertical position for best
results in transmitting the wireless signal. If the wireless signal
quality is poor, change the position of the antennas.
2. Combo Inputs – Connect balanced or unbalanced 1/4” or XLR
line-level sources here.
3. Power Connector –Connect the included 12V DC, 300 mA power
adapter here.
Front Panel
1. Power Button –Press this button to turn the
transmitter on/off.
2. Mono/Stereo Select –Adjust this switch to
change the wireless signal that is sent to the
receiver to be either mono/stereo.
3. Signal Clip Indicator –The LED will turn red when the signal is close to peaking (clipping).
Note: The LED will begin to flicker red at -4 dB before clipping and become solid red if clipping
occurs.
4. Channel Select –Adjusts the frequency band range.
•Match channels on the transmitter and receiver in order to get a signal.
•Watch the receiver’s AF indicator and RF indicator to make sure a signal is being received.
•If you receive interference, change to another channel until a clean signal comes through.
•To change the channel:
a. Press and hold the Channel Select button for approximately 1 second until the
channel number flashes.
b. While the channel number is flashing, tap the Channel Select button to cycle
through the 16 available channels. Set the transmitter and receiver(s) to the same
channel.
c. When the desired channel number is shown, wait for 3 seconds. When the channel
number stops flashing, that channel is now selected.
d. Use the Left/Right Selector switches to set which receiver receives the left and right
signals, since the left and right signals are sent on the same channel.
5. Trim – Adjusts the signal level.
POWER MONO/ STEREO
LR
MIN MAX MIN MAX
CHANNEL
1
2
3
4
55
1
1
2 2 3

5
Receiver Features
Bottom Panel
1. Output –Connect this XLR output to the input of your speaker.
2. Power –Connect the included 12V DC, 300 mA power supply here.
Front Panel
1. Antenna – The wireless receiver’s 2 antennas receive the signal that is
sent from the transmitter. Place the antennas in a vertical position for the
best signal quality.
2. AF Indicator –When illuminated, this LED indicates that an audio signal is
being detected by the receiver. If this LED does not turn on, check your
power connection and channel settings and try again.
3. RF Indicator –When illuminated, this LED indicates that the receiver is
receiving a signal. If this LED does not turn on, check your power
connection and channel settings and try again.
4. Power Indicator –When illuminated, this LED indicates the unit is
powered on.
5. Channel Select – To change the channel:
a. Press and hold the Channel Select button for approximately 1 second until the channel
number flashes.
b. While the channel number is flashing, tap the Channel Select button to cycle through
the 16 available channels. Set the transmitter and receiver(s) to the same channel.
c. When the desired channel number is shown, wait for 3 seconds. When the channel
number stops flashing, that channel is now selected.
d. Use the Left/Right Selector switches to set which receiver receives the left and right
signals, since the left and right signals are sent on the same channel.
6. Power Button –Press this button to turn on the receiver.
Side Panel
1. Left/Right Selector –Selects which stereo channel the receiver receives from the
transmitter. This only applies if both receivers are being used in a stereo application.
On both receivers, set the switch to the appropriate positions that match the L/R
speaker configuration. The Trim controls are directly connected to the L/R receiver
settings.
2. Squelch – Sets a noise limit. Signals must come in above that noise limit in order to
pass through the squelch filter. There are three settings to choose from depending
on how much noise there is. Set this switch to the position that most effectively
eliminates noise while allowing the signal to come through.
1
2
34
5
6
12
1
2

6
Connection Diagrams
Single Channel Setup
To send mono signals through the Stealth Wireless transmitter to a single receiver:
1. Connect your mixer’s main output to an input on the Stealth Wireless transmitter, and connect
the receiver’s output to your loudspeaker’s input. Keep all mixer volume and transmitter Trim
controls their minimum settings.
2. Power on the Stealth Wireless transmitter and receiver. Set their channels to matching numbers.
3. Adjust the transmitter and receiver antennas to a vertical position.
4. Set the transmitter to “mono” and adjust the Trim control to get a strong signal without clipping.
5. Turn on your loudspeaker, adjust the output level on your mixer, and adjust the Trim controls on
the transmitter to hear the audio signal. If you hear noise in the signal, change to a different
channel until a clean signal comes through.
Receiver
Powered
Speaker
Mixer
This diagram shows
the signal flow from a
mixer, through Stealth
Wireless, to a speaker.
Transmitter

7
Dual Channel Setup
To send stereo signals through the Stealth Wireless transmitter to two receivers:
1. Connect your mixer’s main outputs to the input channels on the Stealth Wireless transmitter, and
connect the Stealth Wireless receivers’ outputs to your loudspeaker’s inputs. Keep all mixer
volume and transmitter Trim controls at a minimum.
2. Power on the Stealth Wireless transmitter and receiver. Set their channels to matching numbers.
3. Adjust the transmitter and receiver antennas to a vertical position.
4. Set the transmitter to “stereo” and adjust the Trim controls to get a strong signal without
clipping.
5. Turn on your loudspeaker, adjust the output level of your mixer, and adjust the Trim controls on
the transmitter to hear the audio signal. If you hear noise in the signal, change to a different
channel until a clean signal comes through.
Transmitter
Receiver
Powered
Speaker Powered
Speaker
Receiver
Mixer
This diagram shows the
signal flow from a mixer,
through Stealth Wireless,
to speakers.

8
Speaker Mounting Diagram
See below for three ways to mount Stealth Wireless receivers to powered speakers:
1. M10 Screw: Use the supplied M10 screw to connect the Stealth Wireless receiver to the
powered speaker’s fly point.
2. Hook and Loop Strips: Use the Hook strip and Loop strip to mount the Stealth Wireless receiver
to any flat, stable surface.
3. Machine Screws: Caution: When using the supplied machine screws, check with a qualified
technician as improper installation can destroy internal speaker components.
Troubleshooting
No signal:
•Make sure both the transmitter and receiver are set to the same channel.
•Check the power LEDs on both the receiver and transmitter. If one of them is off, check that the
device’s power adapter is connected correctly.
•Make sure the volume controls on your mixer and speakers are turned up.
Weak signal:
•Make sure there are no objects (computers, walls, pipes, etc.) between the transmitter and
receivers.
•Change the channel on both the transmitter and receiver (to the same channel).
Poor signal quality:
•Make sure the receiver antennas do not touch each other.
•For best signal reception, provide at least 10 feet (3 meters) of separation between the
transmitter and the receiver.
•Keep any connected audio cables away from the antennas.
•Make sure no other devices are sending signals on the same frequency channel that you are
using.
•Change the channel on both the transmitter and receiver (to the same channel).
•Adjust the squelch control setting. A higher squelch setting provides better protection against
interference but may also reduce signal range. Choose a setting that most effectively mutes
interference yet allows the true signal to pass through. If poor signal quality requires a higher
squelch setting, try to eliminate the interference or switch the transmitter/receiver channel to
avoid a loss of signal range.
Mounting screw
Fly Point Hook Strip
Loop
Strip
M10 screw

9
Guía del usuario (Español)
Introducción
Gracias por comprar el sistema Stealth Wireless de Alto Professional. El Stealth Wireless es una
manera conveniente de transportar una señal de audio desde el lugar de mezcla y escucha principal
hasta sus altavoces alimentados. Compatible con cualquier altavoz activo, este sistema se puede
usar para simplificar una nueva instalación o retroinstalar un sistema de sonido existente. Bienvenido
al sonido de la libertad inalámbrica.
Características:
•Conectividad de audio inalámbrica a altavoces activos
•Reemplaza a hasta 60 m (200 pies) de cableado entre la consola y el sistema
•No compromete la calidad del audio
•Banda de UHF confiable, 16 canales seleccionables
•Silenciador de ruidos ajustable que elimina la interferencia
•Transmisor de doble canal: dos entradas combo XLR-1/4 pulg.
•Receptores monocanal: Salida XLR
•Haga crecer su sistema utilizando el Stealth Expander Pack (que se vende por separado)
Contenido de la caja
•Transmisor Stealth Wireless (1)
•Receptor Stealth Wireless (2)
•Fijación tipo Velcro (para receptores)
•Tornillos M10 (2)
•Tornillos para metal (2)
•Adaptadores de alimentación (3)
•Guía del usuario
•Manual sobre la seguridad y garantía
Soporte
Para obtener información completa sobre requisitos del sistema, compatibilidad y registro del
producto, visite el sitio web de Alto Professional: altoprofessional.com.
Para soporte adicional del producto, visite altoprofessional.com/support.
Importante
PRECAUCIÓN La exposición a niveles muy altos de ruido puede causar pérdidas auditivas
permanentes. La Administración de Seguridad y Salud Ocupacional del gobierno de EE.UU. (OSHA)
ha especificado los niveles de exposición permisibles a ciertos niveles de ruido.
Según la OSHA, la exposición a niveles de presión sonora (SPL) elevados que excedan estos límites
puede causar pérdidas auditivas. Cuando utilice equipos capaces de generar SPL elevados, use
protecciones auditivas mientras dichos equipos están en funcionamiento. La tabla siguiente define la
exposición en función de la duración.
HORAS DIARIAS SPL EJEMPLO
890 Música de bajo volumen
692 Tren
495 Tren subterráneo
397 Monitores de escritorio de alto nivel
2100 Concierto de música clásica
1.5 102 Remachadora
1105 Máquina fabril
.50 110 Aeropuerto
0.25 o menos 115 Concierto de rock

10
Características del transmisor
Panel trasero
1. Antenas – Coloque las antenas en posición vertical para
lograr los mejores resultados en la transmisión de la señal
inalámbrica. Si la calidad de la señal inalámbrica es
pobre, cambie la posición de las antenas.
2. Entradas combo – Conecte aquí las fuentes de nivel de
línea de 1/4 pulg. o XLR balanceadas o desbalanceadas.
3. Conector de alimentación –Conecte aquí el adaptador
de alimentación de 12 V CC, 300 mA incluido.
Panel frontal
1. Botón de encendido – Pulse este
botón para encender y apagar el
transmisor.
2. Selector mono/estéreo –Ajuste
este interruptor para cambiar la
señal inalámbrica que se envía al
receptor al modo mono o estéreo.
3. Indicador de recorte de señal –El LED se enciende con luz roja cuando la señal está cerca de
producir picos (recorte).
Nota: El LED comienza a parpadear en rojo a -4 dB antes del recorte y queda encendido
permanentemente si se produce el recorte.
4. Selección de Canal – Ajusta la gama de la banda de frecuencias.
•Haga coincidir los canales del transmisor y receptor a fin de obtener una señal.
•Observe el indicador de AF y de RF del receptor para asegurarse de que se reciba una
señal.
•Si recibe interferencia, cambie a otro canal hasta que obtenga una señal limpia.
•Para cambiar de canal:
a. Pulse y mantenga pulsado el botón de selección de canal durante
aproximadamente 1 segundo hasta que destelle el número de canal.
b. Mientras destella el número de canal, toque el botón de selección de canal para
recorrer los 16 canales disponibles. Ajuste el transmisor y el o los receptores al
mismo canal.
c. Cuando se muestra el número del canal deseado, espere 3 segundos. Cuando el
número de canal deja de destellar, significa que ese canal está seleccionado.
d. Use los interruptores selectores de sector izquierdo/derecho para configurar qué
receptor recibe las señales derecha e izquierda, puesto que las señales derecha e
izquierda se envían por el mismo canal.
5. Ajuste – Permite ajustar el nivel de volumen.
1
1
2 2 3
POWER MONO/ STEREO
LR
MIN MAX MIN MAX
CHANNEL
1
2
3
4
55