Sound Tube MA3501t User manual

Install Instructions For:
MA3501t
©2014SoundTubeEntertainment,Inc.Allrightsreserved. PNINS-MA3501t Rev06.13.14
1.435.647.9555 | 800.647.TUBE | www.soundtube.com
Warning
SoundTube products must be installed by a professional audio installer/contractor. For safety and for
optimum audio performance, installer must follow all directions issued by SoundTube Entertainment.
MA3501t
PROTECT
CLIPPING
POWER
MA3501t
MA3501t, AUDIO DISTRIBUTION AMPLIFIER INSTALLATION MANUAL
FEATURES:
• 350W at 4 ohms direct or 25V, 70V, 100V isolated outputs
• Efcient Class G high current mono-block amplier
• Large Torroidal power transformer and audio output transformer
• Selectable high pass/subsonic lter
• Euro block balanced and dual unbalanced RCA inputs
• Selectable 12V and auto signal sense remote turn on and stand
by options
• Selectable peak/clipping limiter
• High current euro block output connectors
• Dual 115VAC/230VAC operation
• Wind tunnel ow through cooling with variable speed
thermostatically controlled fan
• Overload, short circuit and thermal protection circuits
• Power/standby, clipping and protection LED indicators
• Compact 2U Rack space chassis
DESCRIPTION:
The SOUNDTUBE MA3501t audio distribution amplier is a high
performance audio amplier that is designed for continuous use in
commercial applications. The high efciency Class “G” amplier
design offers high performance in a compact design and utilizes 2
large and efcient toroidal transformers in the amplier power and
audio output sections. The power transformer is a very high current
design for sustained high power output and can operate with
multiple input mains voltage and is thermally protected.
The audio output transformer is a very low distortion design that
provides very clean audio output at high power levels for 25V, 70V
or 100V audio distribution systems.
The MA3501t amplier also has a direct speaker output option that
bypasses the transformer for those applications where it is
necessary to operate 4-16 ohm speaker systems. All of this
performance is in an amplier that is only 2RU in height.
Other application and performance features of the SOUNDTUBE
MA3501t amplier are exible audio inputs connections for both
balanced and unbalanced audio signals. The balanced input
features a Euro Block, Phoenix style connector and the
unbalanced inputs are 2 RCA style jacks that will allow the mix
down of a stereo input signal to a summed mono output.
The amplier offers a switchable peak limit anti-clipping circuit to
help keep the audio clean and undistorted at high output levels
and also a switchable high pass lter to avoid over driven bass
distortion and speaker line transformer saturation from low
frequencies. The MA3501t also provides the installer with remote
turn on and off provisions that can either be switched by an
external 12VDC source with loop through provisions or set to a
program input sensing position that provides turn on and standby
operations in the presents or absents of an audio signal. Both of
the remote features mute the amplier audio output when no signal
is present to avoid any stray hum or noise being reproduced in the
standby mode.
The SOUNDTUBE MA3501t amplier is designed to provide long
term reliability of operation and includes several features to insure
many years of trouble free operation. Besides the oversized
torroidal power and audio transformers the amplier features a
thermostatically controlled cooling fan with ducted heat sink
cooling for the power stage. The protection circuitry includes
thermal shut down over temperature protection for the power
transformer and the power amplier, input power overload
protection, short circuit, DC output and over load protection and
low impedance protection with relay switching to kill the speaker
output and provide protection for speakers systems connected to
the amplier.

Install Instructions For:
MA3501t
MA3501t
SAFETY INSTRUCTIONS
The lightning ash with arrowhead symbol, within an
equilateral triangle, is intended to alert you to the presence of
un-insulated “dangerous voltage: within the product’s
enclosure that may be off sufcient magnitude to constitute a
risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended
to alert you to the presence of important operating and
maintenance (servicing) instructions in the literature
accompanying the appliance.
Explanation of Graphical Symbols
1. Read Instructions - All the safety and operating instructions should be read before the appliance is operated.
2. Retain Instructions - The safety and operating instructions should be retained for future reference.
3. Heed Warnings - All warnings on the appliance and in the operating instructions should be adhered to.
4. Follow Instructions - All operating and other instructions should be followed.
5. Water and Moisture - The appliance should not be used near water - for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a
wet basement, or near a swimming pool, etc.
6. Carts and Stands - The apparatus should be used only with a cart or stand that is recommended by the manufacturer.
PORTABLE CART WARNING
7. Wall or Ceiling Mounting - The apparatus should bemounted to a wall or ceiling only as recommended by the manufacturer.
8. Ventilation - The apparatus should be situated so that its location or position does not interfere with its proper ventilation. For example, the
apparatus should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or placed in a built-in
installation, such as a bookcase or cabinet that may impede the ow of air through the ventilation openings.
9. Heat - The apparatus should be situated away from heat sources such as radiators, stoves, or other appliances that produce heat.
10. Power Source - The apparatus should be connected to a power supply only of the type described in the operating instructions or as
marked on the apparatus.
11. Power Cord Protection - Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed up
or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the apparatus.
12. Cleaning - The apparatus should be cleaned only as recommended by the manufacturer.
13. Nonuse Periods - The power cord of the apparatus should be unplugged from the outlet when left unused for a long period of time.
14. Object and Liquid Entry - Care should be taken so that neither objects fall nor liquids spill into the inside of the apparatus.
15. Damage Requiring Service - The apparatus should be serviced by qualied service personnel when:
16. Servicing - The user should not attempt to service the apparatus beyond those means described in the operating instructions. All other
servicing should be referred to qualied service personnel.
17. Protective earthing terminal. The apparatus should be connected to a mains socket outlet with a protective earthing connection.
a. the power supply cord or the plug has been damaged,
b. objects have fallen onto or liquid has been spilled into the apparatus,
c. the apparatus has been exposed to rain,
d. the apparatus does not appear to operate normally or exhibits a marked change in performance, or
e. the apparatus has been dropped or the cabinet damaged,
f. WARNING: The mains plug (apparatus coupler) is used as disconnect device, the disconnect device shall remain readily operable.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
AVIS RISQUE CHOC ELECTRIQUE NE
PAS OUVRIR

Install Instructions For:
MA3501t
MA3501t
APPLICABLE FOR USA, CANADA OR WHERE APPROVED FOR USAGE
CAUTION: TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE
PLUG TO WIDE SLOT, INSERT FULLY.
1. Lisez les consignes de sécurité - Toutes les consignes de sécurité et de fonctionnement doivent être lues avant l’utilisation de l'appareil.
2 Conservez ces consignes de sécurité - Les consignes de sécurité et d’utilisation doivent être conservées pour référence ultérieure.
3. Respecter les alertes et avertissements - Toutes les alertes et avertissements de sécurité et de fonctionnement indiquées sur l'appareil et
dans la notice d'utilisation doivent être respectées.
4 Suivez les instructions - Toutes les instructions fournies dans la notice d’utilisation et autres instructions doivent être respectées.
5. Eau et humidité - L'appareil ne doit pas être utilisé en présence d’eau ou dans un milieu humide - par exemple, près d'une baignoire, d'un
lavabo, d'un évier, d’un bac à lessive, dans un sous-sol humide, près d'une piscine, etc.
6. Chariots de transport et supports - L'appareil doit être utilisé uniquement avec un chariot ou un support recommandé par le fabricant.
AVERTISSEMENT CONCERNANT LE CHARIOT DE TRANSPORT
7. Montage au mur ou au plafond - L'appareil doit être seulement monté au mur ou au plafond selon les consignes recommandées par le
fabricant.
8. Ventilation - L'appareil doit être placé de telle sorte que son emplacement ou sa position ne gêne pas une ventilation adéquate. Par
exemple, l'appareil ne doit pas être installé ou posé sur un lit, un canapé, un tapis ou une surface similaire qui pourrait bloquer les ouvertures
de ventilation ; ou encastré, comme une bibliothèque ou un meuble, ce qui pourrait empêcher le ux d'air au travers des ouvertures de
ventilation.
9. Chaleur - L'appareil doit être placé loin des sources de chaleur telles que des radiateurs, poêles ou autres appareils produisant de la
chaleur.
10. Source d'alimentation - L'appareil doit être connecté à une source d'alimentation uniquement du type de celle décrite dans la notice
d'utilisation de l’appareil ou tel qu’indiqué sur l'appareil.
11. Protection des cordons d’alimentation - Les cordons d'alimentation doivent être disposés de sorte qu'ils ne soient pas susceptibles d'être
piétinés, ou écrasés par des objets placés contre ou à côté d’eux. Il est nécessaire d’accorder une attention particulière aux cordons au
niveau des prises de courant murales, des réceptacles, et au point de sortie du cordon de l'appareil.
12. Nettoyage - L'appareil doit être nettoyé exclusivement selon les recommandations du fabricant.
13. Périodes de non-utilisation - Le cordon d'alimentation de l'appareil doit être débranché de la prise d’alimentation si l’appareil n'est pas
utilisé pendant une longue période de temps.
14. Objets et liquides - Des précautions doivent être prises pour qu’aucun objet ne tombe ou liquide ne se renverse à l'intérieur de l'appareil.
15. Dommages nécessitant réparation – L’appareil doit être réparé par un personnel qualié lorsque:
16. Entretien régulier et réparation - L'utilisateur ne doit pas tenter d’intervenir sur l'appareil au-delà des conseils donnés dans la notice
d'utilisation. Toute autre intervention doit être effectuée par un réparateur qualié.
17. Borne de terre de protection. L'appareil dolt etre connects a une prise secteur avec une prise de terre.
a. le cordon d'alimentation ou la prise a été endommagé,
b. des objets sont tombés sur, ou du liquide a été renversé dans l'appareil,
c. l'appareil a été exposé à la pluie,
d. l'appareil ne semble pas fonctionner normalement, ou présente un changement marqué dans sa performance, ou
e. l'appareil est tombé, ou le boîtier est endommagé.
f. AVERTISSEMENT: La che d'alimentation (appareil coupleur) est utilisO comme dispositif de dOconnexion, le dispositif de
deconnexion dolt rester facilement accessible.
CONSIGNES DE SÉCURITÉ
ATTENTION: POUR EVITER LES CHOCS ELECTRIQUES, INTRODUIRE
LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE
CORRESPONDANTE DE LA PRESE ET POUSSER JUSQU AU FOND.

Install Instructions For:
MA3501t
MA3501t
1. Amplier ventilation inlet and lter -- the opening has a foam lter material that is installed to prevent dirt, dust and foreign material from
entering the amplier. This lter can be removed for cleaning when necessary and reused. DO NOT BLOCK THIS INTAKE.
2. Power indicator LED -- RED is the power ON in the standby mode, GREEN is ON in the operational mode.
3. Amplier Clipping LED- normally off, ashing RED indicates amplier clipping.
4. Amplier Protection LED- normally off, RED indicates either over temperature or speaker output protection mode.
1. Input Level -- gain adjustment control for setting the amplier volume.
2. Peak Limiter -- helps prevent signal clipping distortion when the amplier is used at high output levels.
3. Subsonic Filter – Used to prevent speaker low frequency overload or line transformer saturation distortion due to high power low frequency
levels to the speakers.
4. Amplier Cooling Vent – Exhaust vent for output of internal cooling fan, DO NOT BLOCK THIS VENT.
5. 230 Volt AC Line Input fuse – This fuse is used only when the amplier is used in the 230 volt AC line input mode. Replace only with the
same type and size of fuse.
6. 115 Volt Line Input Fuse – This fuse is used only when the amplier is used in the 115 volt AC line input mode. Replace only with the same
type and size of fuse.
7. Main Power off and on switch.
8. Chassis Feet -- Used when the amplier is to be placed on a shelf and required for proper air circulation through the chassis ventilation
openings. These feet may be removed for rack mounting applications.
9. Balance Audio Line Input – This is a removable Euro Block type of connector that is designed for balanced audio input signals and requires
the usage of a 2 conductor shielded audio cable with stripped wire ends. A chassis ground is also provided if needed for your installation
10. High Impedance Stereo Input – Dual stereo RCA style input connections that provide high impedance inputs that are mixed to a mono
signal internally in the amplier.
11. Remote Trigger Input/Output -- This is an input and output loop through 12 volt DC trigger connection for the remote turn on and standby
operation of the amplier. A 1/8” mono mini phone plug is used for this purpose with the positive connection to the tip and the negative
connection to the ring. When 9-12V DC is present the amplier will wake up and when power is removed the amplier will revert to the standby
mode. The main power switch must be on.
Front Panel
Rear Panel
123456 7
8 9 10 11 12 13 14 15 16

Install Instructions For:
MA3501t
MA3501t
12. Auto-On Function Switch – This switch sets the mode of operation for the Auto-On functions of the amplier.
ON – The amplier is always on and remote standby is defeated.
Music – The amplier will turn on automatically when it senses an input audio signal and when the audio is removed the amplier will revert to
the standby mode after about 5 minutes.
12V – This position engages the 12 volt trigger remote operation of the amplier. When a 12 volt signal is present the amplier will wake up out
of the standby mode. Removing the 12 volt signal returns the amplier to the standby mode.
13. Direct Speaker Output – This is the amplier output connection for providing direct drive to a loudspeaker system. Speakers with an
impedance of 4 – 16 ohms may be connected to these terminals. Please be certain to check the polarity of your speaker connections. A
removable 2 pole Euro Block style connector is provided for the speaker connection and will accept up to a 12 gauge wire. Strip the ends of
your wires about ¼” from the end. Loosen the 2 screws in the connector and insert the stripped ends into the respective + and – sides of the
terminal block. Tighten the screws down to clamp the wire in place.
Warning: Do not use any Isolated Speaker Output when using Direct Speaker Output. Make sure the combined speaker impedance
connected is not lower than the rated specication (see last page). Failure to do so may result in over-heating of the amplier.
14. Isolated Speaker Connection – This is an isolated speaker output that is provided for distributed audio applications. Outputs are provided for
25 V, 70V and 100V audio installations and are driven by a high quality torroidal audio isolation transformer. A removable 4 pole Euro Block style
connector is provided for the speaker connection and will accept up to a 12 gauge wire. Strip the ends of your speaker wires about ¼” from the
end. Loosen 2 of the screws in the connector and insert the stripped ends into the respective common and the appropriate high side of the
terminal block. Tighten the screws down to clamp the wire in place.
Warning: Do not use the Direct Speaker Output when using Isolated Speaker Output. Use only one Isolated Output at a time with
combined speaker impedance not lower than the rated specication (see last page). Failure to do so may result in over-heating of the
amplier.
Caution: Terminals are live and present an electrical shock hazard, speaker installation should be done by a qualied person and use
approved connection leads.
15. Line Voltage Selector Switch – This switch is used to select the proper AC line voltage input to the amplier for the country of operation.
Selection is for either 115 VAC or 230 VAC and may be selected by using a small at blade screw driver to slide the switch to select the correct
setting.
Warning: Failure to have this switch set to the correct position will damage the amplier.
16. Line Cord Power Socket – This is a standard IEC style 3 pin power connector socket to connect the approved provided power cord from
the amplier to the wall outlet. Use only the correct power cord for the country in which the amplier is to be used or damage to the amplier
may occur.
Avertissement: Ne pas utiliser de sortie isolée lors de l'utilisation directe de l’enceinte de sortie. Assurez-vous que l'impédance des
enceintes combinées connectées ne soit pas inférieure à la spécication nominale (voir dernière page). À défaut de le faire,
l’amplicateur pourrait surchauffer.
14. Connexion de l’enceinte isolée - Ceci est une sortie d’enceinte isolée qui est prévue pour les applications audio distribuées. Les sorties sont
prévues pour 25 V, 70 V et les installations audio 100V et sont entraînées par un transformateur d’isolement audio toroïdal de haute qualité. Un
connecteur A 4 amovible de style Euro Block est prévu pour la connexion des haut-parleurs et accepte un lage jusqu'à un de calibre 12.
Dénuder les extrémités de vos câbles d'enceintes à environ .5 mm de la n. Desserrer 2 des vis dans le connecteur et insérer les extrémités
dénudées dans la commune respective à la hauteur appropriée du bloc de connexion. Serrer les vis en bas pour tenir le l en place.
Avertissement: Ne pas utiliser la sortie directe de l’enceinte lorsque vous utilisez la sortie de l’enceinte isolée. Utilisez seulement une
sortie isolée à la fois avec l'impédance des enceintes combinées et non inférieure à la spécication nominale (voir dernière page) . À
défaut de le faire, l’amplicateur pourrait surchauffer.
Mise en garde: Les bornes sont sous tension et présentent un risque de choc électrique. L'installation de haut-parleurs doit être
effectuée par une personne qualiée en utilisant que des ls de connexion approuvés.
15. Sélecteur de ligne de tension - Ce commutateur permet de sélectionner la tension d'entrée correcte de la ligne d'alimentation à
l'amplicateur pour le pays d’opération. La sélection est soit pour 115 VAC ou 230 VAC et peut être sélectionnée en utilisant un petit tournevis à
lame plate pour glisser le bouton an de sélectionner le réglage approprié.
Avertissement: À défaut de régler ce commutateur sur la position correcte, l’amplicateur pourrait être endommagé.
16. Cordon Prise d'alimentation - Ceci est un prise de connecteur d'alimentation de broches standard CEI 3 pour connecter le cordon
d'alimentation fourni approuvé de l'amplicateur à la prise murale. N’utilisez uniquement que le cordon d'alimentation approprié pour le pays
dans lequel l'amplicateur doit être utilisé sinon des dommages à l'amplicateur pourraient se produire.

Install Instructions For:
MA3501t
MA3501t
SPECIFICATIONS
Description MA3501T Class -G high current commercial audio distribution amplier
Amplier Power 350 Watts RMS < .1% THD @ 4 Ohms, 700 Watts peak , Direct Output
225 Watts RMS < .1% THD @ 8 Ohms, 400 Watts peak , Direct Output
350W - 25V/70V/100V < .1% THD Transformer Output
HP Filter – Switchable
40Hz – 60 Hz
Overall Response 20 – 100 kHz Hz +/- 3 dB Direct, 30 Hz – 35kHz +/- .5 dB
Power Band Width
Response
30 Hz - 65 kHz +0, -3 dB Direct
30 Hz – 50 kHz +0, -3 dB Transformer
Inputs Dual RCA Unbalanced/Single Euro Block Balanced
MaximumInput Sensitivity 175 mV for full output unbalanced /balanced/Variable
THD+ Noise <.05% 20-20kHz below rated output power
S/N >85 dB un-weighted
Damping Factor
>200
Input Impedance
20K unbalanced, 10K balanced
Protection Features Soft Clipping Limiter (Switchable) , Short Circuit/Overload, DC offset
protection,Thermostatic variable speed fan cooling, Thermal overload protection,
Transformer thermal protection, Over current protection
Front Panel Indicators Power/Standby, Clipping, Protection LEDs
Current consumption 120V
3A @ 8 ohms, 5.5A @ 4 Ohms Continuous Program
Operating Voltage
Switchable, 1 15VAC 60HZ @ 9A Max / 230VAC 50 Hz @ 4A Max
Dimensions (Overall)
19” W x 3 3/4” (w/feet) 3 ½” (chassis) H x 13.3/4” D (2 standard RU)
Weight 29.5 lbs.
Minimum Load Impedance
Direct Output- 4 ohms
Isolated Outputs- 2 ohms/25V, 16 ohms/70V 32 ohms/100V

Install Instructions For:
MA3501t
MA3501t
Front
88.9 MM
(3.5 IN .)
95.25 MM
(3.75 IN .)
482.6 MM
(19 IN .)
Side
88.9 MM
(3.5 IN.)
95.25 MM
(3.75 IN .)
349.25 MM
(13.75 IN .)
Top
349.25 MM
(13.75 IN.)
482.6 MM
(19 IN.)

Install Instructions For:
MA3501t
©2014SoundTubeEntertainment,Inc.Allrightsreserved. PNINS-MA3501t Rev06.13.14
1.435.647.9555 | 800.647.TUBE | www.soundtube.com
MA3501t