Installation and operation, cont’d

4Balanced or unbalanced audio input connector — Marked “L” and “R”, this 3.5 mm captive screw input is for bare wire, balanced or unbalanced audio signals.

Tip

Tip

 

Ring

Sleeve

Sleeve (s)

Tip

Tip

 

Ring

Unbalanced Input

Balanced Input

Figure 2-7 — 3.5 mm captive screw audio input connector wiring

Remote control

5Remote input connector — An optional 3-pin captive screw connector that allows a wall mounted audio controller or MediaLink product to remotely control volume and mute levels for the MPA 122 unit.

For more information on using the remote input connector, see Chapter 3, Remote Operation.

Audio output

6Speaker connector — Marked “L” and “R”, this 4-pin, 5 mm captive screw connector is used to connect the amplifier to the speakers.

The recommended MPA 122 output set-up includes 4 ceiling speakers of 8 ohm impedance, (2 sets in parallel with each other), so that each output drives a maximum of 4 ohm loads.

Do not tie both L and R outputs to each other and/ or to input ground. Doing so will short out the outputs and damage the amplifier.

Front Panel Features

 

ON

STEREO LEVEL

BASS

TREBLE

1

LIMITER

 

 

 

OFF

DUAL

MPA 122

MONO

 

 

MINI POWER AMPLIFIER

23

Figure 2-8 — MPA 122 front panel

2-8 MPA 122 • Installation and Operation

1Power LED — A green LED lights to indicate that the unit is receiving power.

2DIP switches — This 2-bank DIP switch controls the limiter (on and off) on one side, and allows for setting the Stereo and Dual Mono modes on the other.

1— Limiter — When the limiter is switched to on, the MPA will automatically reduce the level to prevent the amplifier from clipping.

2— Stereo/Dual Mono:

Stereo mode — In stereo mode, the audio signal input from each channel will be output to the speakers respectively.

Dual Mono mode — In dual mono mode, the inputs from channels L and R will be summed together and output to the speakers as two mono channels. In essence, output L and R contain the same combined signal information.

3Potentiometer adjustments — These three potentiometers optimize level, bass, and treble adjustments.

Setting Up the MPA 122 Amplifier

The following steps ensure optimal sound by adjusting the projector volume to match the level, bass, and treble of the MPA 122 amplifier.

When setting up volume control, ensure that the projector output is set to variable out. Consult the projector’s user manual for detailed instructions on its calibration.

To adjust the MPA 122 input level, bass, and treble, do the following:

1.If connecting to a projector, ensure that the volume on the device is at its lowest point, then adjust the level of the MPA 122 fully counterclockwise.

2.Set the projector volume to its maximum volume level. No sound should come out.

3.Return to the MPA and raise the level until sound distortion occurs, then lower the level slightly until any distortion disappears. This setting ensures that, whatever the projector volume setting may be, no clipping occurs.

4.Adjust bass and treble to preference.

MPA 122 • Installation and Operation

2-9

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Extron electronic user manual Front Panel Features, Setting Up the MPA 122 Amplifier, Remote control, Audio output
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MPA 122 specifications

Extron Electronics is known for its innovative solutions in the field of professional AV systems, and among its comprehensive range of products, the MPA 122 stands out as a highly versatile audio amplifier. Designed to deliver clear and powerful audio in various applications, the MPA 122 is particularly well-suited for installations in conference rooms, classrooms, and other environments where high-quality sound reinforcement is essential.

One of the main features of the Extron MPA 122 is its ability to deliver 2-channel power, with output capabilities of 2 x 60 watts into 4-ohm loads. This dual-channel setup allows for extensive variances in configuration, catering to both stereo and monaural applications. Users can leverage the compact design of the MPA 122, which takes up minimal rack space while providing ample audio output.

The MPA 122 incorporates Extron's advanced Class D amplifier technology, which ensures high efficiency and low power consumption while still delivering impressive sound quality. This technology contributes to reduced operating costs and less heat generation, making the amplifier ideal for integration into tight spaces.

Another characteristic that enhances the MPA 122's appeal is its wide range of input options. The amplifier features both balanced and unbalanced inputs, including 3.5mm stereo and Euroblock connectors. This flexibility simplifies integration into existing systems, allowing users to connect various audio sources seamlessly.

The amplifier also offers comprehensive signal processing capabilities. Integrated DSP features include comprehensive equalization and limiting functions, which allow users to fine-tune the audio output for specific environments. This level of customization ensures that the sound produced is balanced and appropriate for the specific space being used.

Moreover, the MPA 122 is equipped with a built-in priority mixing capability. This function allows one signal to take precedence over others, making it ideal for applications that require announcements or emergency message broadcasting.

Reliability is another key consideration with the MPA 122. The unit is designed for long-term, continuous use and comes with a robust cooling system to prevent overheating during extended operational periods.

In conclusion, the Extron MPA 122 is a high-performance audio amplifier that combines compact design with extensive capabilities. With its advanced technology, versatility in connectivity, and user-friendly features, it stands as an excellent choice for various audio amplification needs in professional installations.
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