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Multi-room audio systems are great for distributing music throughout your home from a centrally located music source, like a mass-storage CD changer. But what if you want to listen to your bedroom TV through your nice-sounding in-wall speakers? This amplifier from Niles Audio is one elegant solution. It lets you switch easily between your central sources and a "local" audio/video component. The compact and powerful TVA50 mounts on the shelf, sidewall or back panel of your audio/video cabinet, for a clean, low-profile installation.

In standby mode, the TVA50 simply passes signals from your main system to your in-wall speakers, so you can listen to your shared music sources. When it senses current coming in from a connected local source (such as your bedroom TV), this high-quality digital amplifier turns itself on and plays that source through your speakers. Enjoy clear, rich sound from a television, game system, CD player, or other audio/video component. This amp can even power up to two pairs of speakers at the same time.

Product Highlights:

  • built-in auto-switching for integration with a multi-room audio system
  • 50 watts x 2 into 4 or 8 ohms at 0.05% THD
  • signal-to-noise ratio: >94 dB
  • automatic current-sensing power on/off
  • voltage trigger on/off input accepts 3V-30V AC/DC
  • 12VDC control-out trigger output (200mA)
  • 3.5mm mini phone jack for trigger in and out
  • gold-plated RCA inputs for local source component
  • accommodates two pairs of speakers via removable screwless connectors
  • adjustable gain
  • DC, short-circuit, and overload protection with automatic reset
  • grounded, current-sensing AC outlet (for powering local source component)
  • detachable three-wire IEC line cord included
  • 8"W x 2-1/4"H x 7-1/2"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

Niles TVA50 Reviews

Hands-on research

What's in the box?

Download owner's manual

  • TVA50 Amplifier
  • 7.5' AC power cord
  • 4 Four-pin speaker connectors
  • 4 Rubber feet
  • Installation and operation guide

Product Research

Overview: The TVA50 is an automatically switching amplifier designed to integrate a whole-house audio system with a local source (TV, CD player, etc-located in the same room as the speakers). The amp has a line-level input, two pair of speaker level inputs, and two pair of speaker outputs. When the TVA50 is turned off, the speaker inputs are shorted with the speaker outputs and the whole-house system operates as if the amp wasn't there. When the TVA50 is turned on, it disconnects the speaker level inputs, amplifies the line-level signal from the local source, and feeds it to the connected speakers.



Automatic Trigger: There are two methods of turning the TVA50 on; current sensing and voltage trigger. If a source unit is plugged into the AC output on the amp, it recognizes the current drawn when that unit is turned on, and the amp also turns on automatically. The amp also turns on when an AC or DC voltage (3-30 volts) is applied to the 3.5mm trigger input.

Trigger Output: Whenever the amp is on, a 12-volt DC/200mA output (3.5mm) is energized to trigger an outboard device (TV lift, projection screen, drapes, etc).

Volume Control: The relative amp volume is adjustable so you can choose a level similar to the incoming whole-house signal. Once the amp volume is set to match the incoming signal, day to day volume adjustment is typically made on the source unit.

Current Sensitivity: Most components draw some nominal current when they're off. The current sensing circuit is adjustable to account for that idle current.

Protection Circuitry: The amp has automatic DC voltage, short circuit, and overload protection.

Speaker Wire: The speaker connectors will accept stranded copper wire up to 14-gauge. Niles recommends 16-gauge for wire runs under 80 feet and 14-gauge for 80 feet or more. Larger wire will not fit into the connectors and is not recommended.

Impedance: When using one pair of speakers, 4Ω, 6Ω, or 8Ω speakers are compatible. Use only 8Ω speakers when connecting two pair.

Mounting: The TVA50 can be mounted horizontally (four rubber feet included) or vertically (four keyhole slots on the back).


Power: 50 watts RMS per channel into 4Ω or 8Ω

S/N: >94 dB

THD: 0.05% at rated power

Line Input Sensitivity: 500 mV

Input: 120 volts AC, 60 Hz

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