DS00395ACA-TVA50.
DS00395ACA-TVA50.qxp S T E R E O TVA50 6/1/04 A 9:51 AM M P L I F I E R / Page 1 A U T O M A T E D S W I T C H E R IMPORTANT SAFETY INSTRUCTIONS STEREO AMPLIFIER/ AUTOMATED SWITCHER 1. Read these instructions. 2. Keep these instructions. TABLE OF CONTENTS Introduction 3 Features and Benefits 4 TVA50 Parts Guide 5 Installation Considerations 11 Installation 13 TroubleShooting 23 Specifications 24 Contents 24 3. Heed all warnings. 4. Follow all instructions. 5.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 2 A U T O M A T E D S W I T C H E R 11. Only use attachments/accessories specified by the manufacture. 12. Unplug this apparatus during lightning storm or when unused for long periods of time. 13. Refer all servicing to qualified service personnel.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 3 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 4 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 5 A U T O M A T E D S W I T C H E R 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 activate and switch inputs when 3-30 volts AC or DC is present. 4. 12V Trigger OUT – 3.5mm mini-phone jack.
DS00395ACA-TVA50.
DS00395ACA-TVA50.
DS00395ACA-TVA50.
DS00395ACA-TVA50.
DS00395ACA-TVA50.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A “TECH TIP” 9:51 AM M P L I F I E R / Page 11 A U T O M A T E D S W I T C H E R INSTALLATION CONSIDERATIONS 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 wholehouse system and to the local speakers, is also necessary. Installation on a cabinet shelf, sidewall or back panel are all acceptable.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 12 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 13 A U T O M A T E D S W I T C H E R 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 speaker 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 14 A U T O M A T E D S W I T C H E R 3. Gradually turn the sensitivity adjustment screw located on the bottom of the TVA50 (Figure 6) until you hear the internal 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 15 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 16 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 17 A U T O M A T E D S W I T C H E R 3. Use a small flathead screwdriver or your thumbnail to raise the locking tabs, exposing the holes on the removable connector plug. 4. Insert each wire into the appropriate hole on the removable 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 18 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 19 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 20 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 21 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 22 A U T O M A T E D S W I T C H E R 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.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / TROUBLESHOOTING TVA50 will not power up Is TVA50 plugged in to an unswitched outlet? Page 23 A U T O M A T E D S W I T C H E R Are the speakers connected to the TVA50? Are the 4 pin speaker connector plugs (IN/OUT; A/B) properly seated? Is the POWER/ACTIVE LED Red? Is the speaker wire properly stripped? 120VAC measured from outlet with voltmeter? Are the lock tabs snapped down? Try another unswitched outlet.
DS00395ACA-TVA50.qxp S T E R E O 6/1/04 A 9:51 AM M P L I F I E R / Page 24 A U T O M A T E D S W I T C H E R SPECIFICATIONS Power: 50 watts per channel RMS into 4/8 ohms. Trigger voltage: IN: 3-30VAC/DC Trigger voltage OUT: 12VDC/200mA S/N Ratio: >94dB AC requirement: 120V – 60Hz THD: Input sensitivity: 500mV @ full output .05% at rated power. Mounting: Horizontal or vertical mounting. Keyholes in back panel for vertical mount.
DS00395ACA-TVA50.
DS00395ACA-TVA50.
DS00395ACA-TVA50.qxp 6/1/04 9:51 AM Page 27 Niles Audio Corporation www.nilesaudio.com 12331 S.W. 130 Street Miami, Florida, 33186 Tel: (305) 238-4373 Fax: (305) 238-0185 ©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.
