Niles Audio Stereo Amplifier TVA50 User Manual

I N S T A L L A T I O N & O P E R A T I O N G U I D E  
TVA50  
STEREO AMPLIFIER/ AUTOMATED SWITCHER  
®
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11. Only use attachments/accessories specified by the manu-  
facture.  
12. Unplug this apparatus during lightning storm or when  
unused for long periods of time.  
13. Refer all servicing to qualified service personnel. Servicing  
is required when the apparatus has been damaged in any  
way, such as power-supply cord or plug is damaged, liquid  
has been spilled or objects have fallen into the apparatus,  
the apparatus has been exposed to rain or moisture, does  
not operate normally, or has been dropped.  
14. WARNING: To reduce the risk of fire or electric shock, this  
apparatus should not be exposed to rain or moisture and  
objects filled with liquids, such as vases, should not be  
placed on this apparatus.  
15. To completely disconnect this equipment from the main,  
disconnect the power supply cord plug from the receptacle.  
The lightning flash with arrowhead symbol, within  
an equilateral triangle, is intended to alert the user  
CAUTION  
to the presence of uninsulated dangerous voltage  
within the product’s enclosure that may be of  
CAUTION: TO REDUCE  
sufficient magnitude to constitute a risk of electric  
THE RISK OF ELECTRICAL  
shock to persons.  
SHOCK, DO NOT REMOVE  
The exclamation point within an equivalent  
triangle is intended to alert the user to the  
presence of important operating and maintenance  
(servicing) instructions in the literature accompany-  
ing the appliance.  
COVER. NO USER-SERVICE-  
ABLE PARTS INSIDE. REFER  
SERVICING TO QUALIFIED  
SERVICE PERSONNEL.  
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INTRODUCTION  
A common challenge in designing whole-house audio/video  
distribution systems is allowing a local source, such as audio  
from a bedroom TV, to play through the main system speakers  
in that room. The TVA50 is the perfect solution. When  
activated, by either current sensing or a voltage trigger the  
TVA50 interrupts the main system’s speaker level signal, and  
switches to the local source. When the device (TV) is turned  
OFF, the speakers are switched back to the main system’s  
audio program.  
The TVA50 delivers the quality of audio amplification needed  
to match the high performance amplifiers used in whole-house  
systems. The TVA50 is also the perfect companion for added  
flexibility in whole-house systems using Niles SI Series Multi-  
Channel Amplifiers, or ZR Series Multi-Zone Receivers.  
Whatever the application, switching to a local TV, computer,  
portable CD or MP3 player, the TVA50 is the clear choice of  
professional installers who need solid, reliable performance  
from an automated switching amplifier.  
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FEATURES AND BENEFITS  
• Compact Size - Allows installation on cabinet shelves, side  
walls or back panels.  
• RCA Line In Jacks - Two gold plated RCA jacks for line level  
audio input from local device.  
• 4 Pin Screwless Speaker Connectors  
• Efficient Digital Technology - TVA50 incorporates digital  
amplifier technology to deliver high output from a small  
footprint.  
• Current Sense - The current sensing circuit provides reliable  
switching between the whole house and the local source.  
Trigger In - The presence of 3-30VAC/DC at the TRIGGER IN  
terminal switches the TVA50 to the local source.  
• 12VDC Trigger Out - Any time the TVA50 is switched to local  
source, a 12VDC 200mA trigger voltage is emitted and can  
be used to control other devices.  
• Volume Control - Adjusts the TVA50 amplifier output level.  
• Multiple Speaker Pairs - The TVA50 allows automated switch-  
ing of either one or two pairs of speakers.  
• 4 ohm Capability - The TVA50 is designed to remain stable  
with a 4 ohm load.  
• DC, Short Circuit and Overload Protection - An automatic  
protection circuit safeguards TVA50.  
• 2 Year Warranty - Two year parts and labor warranty.  
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TVA50 PARTS GUIDE  
1. AC IN – Removable three-prong IEC compatible power cord.  
2. Current Sensing AC Outlet – TVA50 will activate and switch  
inputs when it senses a current draw from a connected  
device.  
3. Voltage Trigger IN – 3.5mm mini-phone jack. TVA50 will acti-  
vate and switch inputs when 3-30 volts AC or DC is present.  
4. 12V Trigger OUT – 3.5mm mini-phone jack. 12VDC 200mA  
control output for automated control of lifts, screens, drapes,  
etc.  
5. Audio Line IN – Gold plated RCA type connectors. Local  
source input. TVA50 switches to this input in either current  
sense or 12V Trigger IN modes.  
6. Volume Control – Adjusts TVA50 amplifier output level.  
7. Speaker A Input/Output – Four-pin speaker connector plugs.  
Screwless and removable for easy installation.  
8. Speaker B Input/Output – Four-pin speaker connector plugs.  
Screwless and removable for easy installation.  
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1
Figure 1  
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Figure 2  
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To Current Sensing Outlet  
TVA-50  
TV - Power  
Cord  
To Unswitched  
Outlet  
Right/Left  
TV Variable  
Line Out  
To Speaker  
(A) Input  
Speaker  
(A) Out  
TV - Local Room  
Right  
Left  
Right  
Left  
Speaker (A)  
Whole House Receiver  
Figure 3  
TV current sense with one speaker pair  
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To Current Sensing Outlet  
TVA-50  
TV - Power  
Cord  
To Unswitched  
Outlet  
Right/Left  
TV Variable  
Line Out  
Speaker (B) Out  
Right  
TV - Local Room  
Right  
Left  
Speaker (A) Out  
Left  
Right  
Left  
To Speaker  
(A) Input  
Speaker (B)  
Right  
Left  
To Speaker (B) Input  
Speaker (A)  
Whole House Receiver  
Figure 4  
TV current sense with two pair of 8 ohm speakers  
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TV - Power  
Cord  
To Current Sensing Outlet  
TVA-50  
To Unswitched  
Outlet  
12VDC Trigger  
out to TV lift  
12VDC  
Niles IR  
Flasher  
Right/Left  
TV Variable  
Line Out  
Speaker (A) Out  
To Speaker (A) Input  
TV - Local Room  
Right  
Left  
Right  
Left  
Niles MSU480  
Speaker (A)  
Whole House Receiver  
IR Remote  
Figure 5  
TV current sense with one speaker pair and a TV lift  
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5-7/16"  
4-15/16"  
Figure 6:  
Bottom of the unit with measurements for wall mounting  
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INSTALLATION CONSIDERATIONS  
“TECH TIP”  
Location  
The TVA50 should be installed near the device to be switched,  
ideally within 15 feet, to avoid signal loss and degradation over  
long runs of wire. Access to the speaker wires, from the whole-  
house system and to the local speakers, is also necessary.  
Installation on a cabinet shelf, sidewall or back panel are  
all acceptable.  
Wire size is expressed  
by it’s AWG (American  
Wire Gauge) number.  
The lower the AWG  
number, the larger the  
wire, i.e., 20 AWG wire  
is physically larger than  
22 AWG.  
Type of Speaker Wire  
We recommend 16-gauge stranded copper speaker wire for  
most connections, and 14-gauge wire for runs longer than 80’.  
Don’t use wire larger than 14-gauge, because larger wire may  
not fit into the connectors.  
Type of Audio Cable  
Shielded stereo audio cables with quality gold-plated connec-  
tors are recommended. Use low capacitance cables for runs  
that exceed 15’ to minimize signal loss. Wire runs greater than  
50’ are recommended only with cable that has been specifical-  
ly designed for such applications. Contact your cable manufac-  
turer for a specific cable recommendation when wire runs  
exceed 50’.  
Power Requirement  
Power the TVA50 with an unswitched AC 120V, 60Hz outlet.  
There is no power ON/OFF switch. The unit will automatically  
activate when a switching condition (current sense or 12V  
Trigger IN) is detected.  
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Speakers  
The TVA50 will remain stable when driving a 4 ohm load. If only  
one pair of speakers is being driven, 4, 6 or 8 ohm  
speakers systems can be used. If switching two pairs, 8 ohm  
speakers must be used.  
Fixed/Variable Line Level Outputs  
To control the TV volume through the speakers, the variable  
output on the TV must be connected to the TVA50 Line IN.  
Using Volume Controls  
Depending on your installation in-wall volume controls may be  
used to control the speaker level. Connect the in-wall volume  
control to the TVA50 speaker output. This requires use of the  
fixed output on the TV. In this application, volume for all  
sources is controlled with the in-wall volume control.  
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INSTALLATION  
Preparing for Installation  
1. Figure 3 shows a typical application for switching one pair  
of speakers to a local source using current sensing. Refer to  
the other system applications for switching multiple speak-  
er pairs, and use of the Trigger IN/OUT. If your application  
is different from those diagrams, use appropriate system  
design software or draw it out on paper. Make note of all  
parts and components needed for installation, TVA50,  
speakers, wire, etc.  
2. Once the system has been designed, test the system design  
prior to installation to assure performance and eliminate  
time wasted running around shopping for parts not speci-  
fied or missing.  
3. Run all necessary wiring to the TVA50, local source, and  
speakers. Label the wires for future reference.  
Adjusting Current Sensitivity  
The current sensing capability of the TVA50 is adjustable via  
a recessed screw located on the bottom of the unit (Figure 6).  
This allows for the adjustment of the current sensing  
outlet based on the amount of current draw from the local  
source component.  
1. Plug the power cord of the local source component (i.e. TV)  
into the current sensing outlet of the TVA50.  
2. Turn the local source component on.  
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3. Gradually turn the sensitivity adjustment screw located on  
the bottom of the TVA50 (Figure 6) until you hear the inter-  
nal relay of TVA50 switch. This is indicated by a clicking  
sound inside the unit. The Power/Active LED on the front  
panel of the TVA50 (Figure 7) provides a visual indication of  
the local switching. When the TVA50 switches to the local  
input the Power/Active LED will change from red to green.  
4. Cycle the power of the local source component on and off.  
Adjust the sensitivity setting of the TVA50 until the internal  
relay switches reliably.  
NOTE: The TVA50 may be set to operate continuously by turning  
the sensitivity screw fully counterclockwise. This will bypass the  
internal sensing mechanism.  
Figure 7:  
TVA50 Power/Active LED  
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Installation  
Caution: Turn the power OFF to all components in the system  
to prevent accidental shorting or electrical shock.  
Mounting the TVA50  
When possible, the TVA50 should be installed near the device  
to be switched. An unswitched 120VAC outlet is required to  
power the TVA50. (Unit should remain unplugged during  
installation.) Care should be taken to provide adequate space  
for access and connections.  
Horizontal (Shelf) Mount.  
Install the supplied self adhesive rubber feet to the bottom of  
the TVA50. The unit can be placed on top of a shelf in a wall  
unit or equipment cabinet. Nothing should be placed on top of  
the unit.  
Vertical (Wall) Mounting.  
The unit can also be attached to the side wall or back panel of  
a wall unit or equipment cabinet using the keyholes on the  
back of the TVA50.  
1. Using a level and tape measure, install four drywall screws  
according to the measurements shown in Figure 6.  
2. Align the keyholes on the back of the TVA50 with the  
mounting screws and slide the unit down until it locks.  
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Connect Whole-House System  
1. Locate the 4 pin speaker connector plug for SPEAKER A IN  
(and remove if plugged in).  
2. Strip 1/4" of insulation from the end of each wire for  
SPEAKER A IN, coming from the speaker level output of the  
whole-house system amplifier. Tightly twist the end of each  
wire until no frayed ends remain.  
3. Use a small flathead screwdriver or your thumbnail to raise  
the locking tabs, exposing the holes on the removable con-  
nector plug.  
4. Insert each wire into the appropriate hole on the remov-  
able connector plug, and snap the locking tab down.  
NOTE 1: If switching two speaker pairs, (Figure 4), repeat steps  
1-4 above for SPEAKER B IN.  
NOTE 2: Maintain proper polarity. Connect the positive terminals  
on the TVA50 to the positive terminals on the whole-house ampli-  
fier. Connect the negative terminals on the TVA50 to the negative  
terminals on the whole-house amplifier. To help you avoid improp-  
er phasing, the connector plug is keyed. Insert the smooth side of  
the connector plug into the smooth side of the socket. Don’t force  
the scalloped side of the connector plug into the smooth side of  
the socket.  
Connect Speakers  
1. Locate the 4 pin speaker connector plug for SPEAKER A  
OUT (and remove if plugged in).  
2. Strip 1/4" of insulation from the end of each wire  
for SPEAKER A OUT, that will connect to the local room  
speakers. Tightly twist the end of each wire until no frayed  
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3. Use a small flathead screwdriver or your thumbnail to raise  
the locking tabs, exposing the holes on the removable con-  
nector plug.  
4. Insert each wire into the appropriate hole on the remov-  
able connector plug, and snap the locking tab down.  
NOTE 1: If switching two speaker pairs, repeat steps 1-4 above  
for SPEAKER B OUT. When switching two pairs, 8 ohm speakers  
must be used.  
Connect Local Source  
A common application for the TVA50 is to be able to switch  
the speakers used in a whole-house audio system to a TV in a  
local room. In order to be able to adjust the volume when  
switched to a local TV, it is necessary to use the variable line  
level output of the TV when connecting to the TVA50. Doing  
so will allow the user to adjust the volume using the TV’s  
remote control, as if the TV speakers were being used.  
1. Connect the variable line level output of the TV to the RCA  
type Line IN jacks on the TVA50.  
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NOTE: Some TVs have separate fixed (non-adjustable) and  
variable line outs. Some need to be switched using  
the TV’s on-screen menu. Refer to the TV manual for  
additional information.  
Source Switching  
The TVA50 has two switching modes. Current Sensing and AC  
or DC voltage trigger. In current sense mode, the TV power  
cord gets plugged into the Current Sensing AC outlet on the  
TVA50. When the TV is turned ON, the TVA50 can detect an  
increase in current draw and will switch to the stereo Line IN.  
The TVA50 will also switch to Line IN when 3-30VAC/DC is  
applied to the Trigger IN.  
Current Sensing  
Plug the AC power cord of the TV into the Current Sensing AC  
outlet on the TVA50.  
Volume Calibration  
The volume control on the TVA50 adjusts the amplifier output  
level when switched to the local device, (Line IN). Turning the  
volume control clockwise will increase volume, turning coun-  
terclockwise will reduce volume.  
NOTE: The internal speakers of the TV should be switched off  
before proceeding. Refer to the owner’s manual for your TV for  
instructions.  
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BEFORE PROCEEDING SET THE VOLUME CONTROL  
ON THE TVA50 TO THE MINIMUM POSITION (FULLY  
COUNTERCLOCKWISE).  
1. Play a source (CD, Tuner) on the whole-house system. Set  
the volume to a normal listening level.  
2. Turn the TV on. The TVA50 will sense the TV power, activate  
and switch to the local source (TV).  
3. Using the remote control for the TV or the volume control  
on the TV, turn the volume on the TV all the way up. (Use  
the on-screen volume bar or numeric display for reference).  
4. Slowly turn the volume control on the TVA50 clockwise, until  
the audio from the TV is coming out of the speakers at the  
loudest level that will ever be used. (If the sound is distorted,  
reduce TV volume.) This will be the maximum level the TV  
will play through the TVA50 and speakers.  
5. Reduce TV volume to a normal listening level.  
6. Turn the TV off. The system should switch back to the whole-  
house system. Properly tuned, the speaker level from the  
whole-house system and TV should be about the same at a  
normal listening level.  
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NOTE: The speaker level, when switched from the whole-house  
system to the TV will not always be the same. If the whole-house  
system was set to CD with the volume turned up and the TV gets  
turned on to it’s normal listening level, the speaker level might  
drop when the system switches to TV. This is normal performance  
and the user can adjust whole-house speaker level and TV speaker  
level as needed depending upon the source selected and the users  
preference.  
Using In-Wall Volume Controls  
In a whole-house audio distribution system, an in-wall volume  
control, such as the Niles VCS100R or MVC100R, can be used  
to adjust the speaker level in a given room. There are two  
options for using volume controls with the TVA50. Both of  
these examples assume use of a multi-channel audio distribu-  
tion amplifier such as the Niles SI-1260.  
Example1: In-Wall Volume Control With a Variable  
Output Device  
When switching to a variable output device such as a TV with  
the TVA50, the volume control for the whole-house system  
should be installed between the whole-house amplifier and  
the TVA50. In whole-house mode, the TVA50 will pass the  
speaker level output of the whole-house system straight  
through to the speakers. A volume control, installed between  
the whole-house system and the TVA50, provides speaker level  
control of the whole-house sources. (CD, Tuner, etc). When  
switched to TV, speaker level can be controlled using the TV  
remote control volume commands or the volume Up/Down  
controls on the front of the TV.  
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Example 2: In-Wall Volume Control With a Fixed  
Output Device  
In some applications, it may be desirable to control speaker  
level of both the whole-house sources and the TV, or perhaps a  
local CD or DVD player that might not have a variable output,  
with the in-wall volume control. In this application, the vol-  
ume control would be connected to the output (SPEAKER  
OUT) of the TVA50 and the fixed line level output of the TV or  
local device would be used.  
NOTE: If driving speakers and using volume controls on both  
SPEAKER OUT A and B, minimum acceptable impedance is 4  
ohms. Be sure to check speaker specifications and impedance  
magnifying settings on the volume controls to assure proper per-  
formance. Exceeding this load will cause the TVA50 to go into pro-  
tection and shut down.  
12V Trigger Out  
The TVA50 has a 12VDC 200mA Trigger OUT that will be acti-  
vated in the current sense mode or when 3-30V AC/DC is  
detected on the Trigger IN terminal. This Trigger OUT voltage  
can be used to control 12VDC controlled devices such as  
drapes, screens and TV lifts.  
12V Trigger Out and a TV lift  
In certain exotic applications, it is desirable to keep all compo-  
nents hidden from sight when not in use. A TV mounted in a  
lift cabinet is a perfect example. When not in use, the TV is  
hidden away in an attractive furniture quality cabinet. A  
motorized lift mechanism will raise the TV up out of the cabi-  
net for use when activated by voltage, IR or RF commands.  
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Integrating a Niles IR repeater system with a TV plugged  
into the current sensed outlet of a TVA50, and a 12VDC  
controlled lift mechanism, provides an inexpensive, yet  
elegant solution to system automation. (Figure 5) When the  
system is in whole-house mode, music from the main system  
plays through the in-wall speakers in a room. The TV is hidden  
away in the lift cabinet. With a Niles MS100 Microsensor™  
inconspicuously mounted in the lift cabinet, and properly  
configured for control of the TV hidden inside, the TV power  
ON command from an IR remote control, will turn the TV on.  
The TVA50 current sensing outlet will detect the change in  
current draw, switch the local room speakers to TV and send a  
12VDC Trigger OUT to the lift and automatically raise the TV  
out of the cabinet...all from just the ON command for the TV!  
Turn the TV OFF, the TVA50 current sensed outlet detects the  
change, switches the speakers back to the whole-house system  
and cuts the 12VDC Trigger OUT causing the lift to lower the  
TV back into the cabinet.  
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Are the speakers connected to the  
TVA50?  
TROUBLESHOOTING  
TVA50 will not power up  
Are the 4 pin speaker connector plugs  
(IN/OUT; A/B) properly seated?  
Is TVA50 plugged in to an unswitched  
outlet?  
Is the speaker wire properly stripped?  
Are the lock tabs snapped down?  
Is the POWER/ACTIVE LED Red?  
120VAC measured from outlet with  
voltmeter?  
Is the whole-house audio source ON  
and playing?  
Try another unswitched outlet.  
Is the volume up on the whole-house  
system?  
TVA50 will not activate (Current  
Sense Mode)  
Is the TV plugged in to the sensed out-  
let on the TVA50?  
If using an in-wall volume control, is it  
turned up?  
Is the TV turned ON?  
No audio output A pair/B pair  
(local/switched mode)  
TVA50 will not activate (12V Trigger  
Mode)  
Is the POWER/ACTIVE LED on the  
TVA50 Green?  
Is the voltage on the TRIGGER IN ter-  
minal 3-30 VAC/DC?  
Is the TV/source line out connected to  
the LINE IN on the TVA50?  
Is polarity of 3.5mm miniplug correct?  
(tip=+12VDC; sleeve=ground. DC  
only. Polarity non-critical for AC  
voltage trigger.)  
Is the volume up on the TV?  
Is the volume control on the TVA50  
properly adjusted?  
No audio output A pair/B pair  
(whole-house/nonswitched mode)  
Is the POWER/ACTIVE LED Red?  
Audio level in local/switched mode  
too high/low  
See "Volume Control" section, page 15.  
23  
 
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SPECIFICATIONS  
Trigger voltage: IN: 3-30VAC/DC  
Power: 50 watts per channel RMS into  
4/8 ohms.  
Trigger voltage OUT: 12VDC/200mA  
AC requirement: 120V – 60Hz  
Input sensitivity: 500mV @ full output  
Dimensions: 2-1/4"H x 8"W x 7-1/2"D  
Weight: 3-1/2" lbs  
S/N Ratio: >94dB  
THD:  
.05% at rated power.  
Mounting: Horizontal or vertical mount-  
ing. Keyholes in back panel for vertical  
mount.  
Connectors:  
CONTENTS  
12V Trigger IN/OUT: 3.5mm mini  
phone jack.  
TVA50  
1
1
4
4
LINE IN: Gold plated RCA  
IEC three prong AC power cord  
Screwless connectors  
Self adhesive rubber feet  
SPEAKER (All): Screwless 4 pin plug-in.  
AC IN: IEC type three prong.  
Current Sensing Outlet  
Wire requirements: 14-16 gauge two-con-  
ductor speaker wire for all speaker level  
connections.  
24  
 
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Notes  
25  
 
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Notes  
26  
 
Niles Audio  
Corporation  
©2004 Niles Audio Corporation. All rights reserved. Niles, the Niles logo, IntelliPad and Blending High Fidelity  
and Architecture are registered trademarks of Niles Audio Corporation. MicroFlasher is a trademark of Niles  
Audio Corporation. Because we strive to improve our products. All other trademarks are the property of their  
respective owners. Niles reserves the right to change product specifications without notice. The technical and  
other information contained herein is not intended to set forth all technical and other specifications of  
1-800-289-4434. 04/04 Printed in Canada. DS00395ACA  
12331 S.W. 130 Street  
Miami, Florida, 33186  
Tel: (305) 238-4373  
Fax: (305) 238-0185  
 

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