MA-1212 Mixer Amplifier

120-Watt, 12 Input

Mixer Amplifier

General Description:

The Electro-Voice ® MA-1212 is a 120-watt, twelve-input mixer amplifier designed for commercial sound applications. It features twelve separate input controls which can be used to adjust the level from any of 12 input sources. Figure 1 shows the layout of the front and rear panels.

Input channels 1-10 are designed to either be used as low-Z balance microphone or line level inputs. The combination connector on inputs 1-10 permits use of either XLR or ¼” input connectors. The block diagram shown in Figure 2 outlines the signal flow for the MA-1206. A signal appearing at either input 1 will automatically mute the other channels unless the mute function is defeated via a switch on the rear panel.

Inputs 11 and 12 are for auxiliary line-level sources such as tape or CD players. Mono or stereo signals may be applied to inputs 11 or 12. The left and right components of a stereo signal can be applied to the dual RCA phono jacks of these inputs and mixed together to drive the built- in monaural power amplifier. A rear panel paging input with gain control is provided for the paging output of a telephone system. An audio signal appearing at this input automatically mutes all other inputs. A preamplifier output jack and power amplifier input jack permit the mixed output to be fed to an external signal processor (graphic EQ or compressor), and then returned to the built-in amplifier. The preamp output may be used to drive an additional power amp with its own set of speakers without interrupting the function of the built-in amplifier.

There is also a 24v dc power option to operate the unit off of a 24v emergency power source. The speaker output is available at a barrier strip, which includes terminals for driving low impedance loudspeaker loads, as well as 25, 70.7 or 100 volt distributed systems.

at the paging input, it shall automatically mute other input sources. The paging input shall be equipped with its own gain control. There shall be a master level control. Separate bass and treble equalization controls shall be provided. The mixer amplifier shall meet the following performance criteria: output power shall be 120 watts; total harmonic distortion shall be less than 1% at 1 kHz; frequency response shall be within ±3 dB from 50 Hz to 15 kHz; input impedance shall be 600-ohms (balanced inputs) or 47 kW (unbalanced inputs); nominal load impedance shall be 4-, 8- or 16-ohms for voice- coil-connected loudspeakers, 25, 70.7 or 100-volt nominal transformer windings for the constant-voltage output.

In addition to a preamplifier output/power amplifier input link, there shall also be a line-level balanced XLR output. The mixer amplifier shall operate from either a standard 120 V ac 50/60 Hz or a 24V dc power source, and measure 13.3 cm (5.2 in.) high x 48.0 cm (18.9 in.) wide x 32.0 cm (12.6 in.) deep. The net weight shall be 11.5 kg (25.4 lb). The mixer amplifier shall be the Electro-Voice ® Model MA-1212.

Architects’ and Engineers’ Specifications:

The mixer amplifier shall have twelve input channels, with individual mix gain controls. Input channels 1 through 10 shall be configured for either low-Z balanced microphone operation or hi-Z line level signals via switches on the rear panel. A signal present channel 1 shall trigger the muting of channels 2-12. The mute circuit shall be defeatable using a switch on the rear panel. Inputs 1 - 10 shall be available via combination female XLR / ¼” connectors. Inputs 11 and 12 shall accept either monaural or stereo sources. If a stereo source is connected, it shall be properly mixed to mono via a resistor network mounted on the input plate. There shall be a paging input that accepts a 600-ohm line- level feed from a phone system. When a signal is present

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Electro-Voice specifications MA-1212 Mixer Amplifier, General Description, Architects’ and Engineers’ Specifications
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MA-1212 specifications

The Electro-Voice MA-1212 is a versatile, high-performance audio solution designed to meet the diverse needs of professional sound reinforcement. As a key part of the Electro-Voice product line, the MA-1212 stands out for its innovative features, reliability, and superior sound quality, making it a preferred choice for venues ranging from concert halls to corporate events.

One of the main features of the MA-1212 is its dual 12-inch woofer design, which delivers powerful bass response while maintaining clarity in the mid and high frequencies. This dual-driver configuration enables the speaker to handle high sound pressure levels without distortion, ensuring a consistent audio experience, even in large spaces. The robust construction of the cabinet enhances durability and minimizes unwanted resonance, allowing the system to perform optimally under various conditions.

The MA-1212 employs cutting-edge technologies such as high-frequency waveguide management, which contributes to even sound distribution across the listening area. This technology optimizes the dispersion pattern of the sound, making it suitable for both indoor and outdoor applications. Furthermore, the speaker integrates advanced electronic processing, ensuring seamless performance across a wide range of frequencies. This capability allows audio professionals to achieve precise EQ adjustments, tailoring the sound to meet specific venue requirements.

One of the distinct characteristics of the MA-1212 is its versatility. It can function as a standalone unit or be integrated into larger sound systems, adapting effortlessly to different configurations. This makes it ideal for various applications, including live performances, DJ setups, corporate AV presentations, and more. The speaker is also equipped with multiple input options, facilitating easy connectivity with a range of audio sources.

Moreover, the MA-1212's sleek design not only enhances its aesthetic appeal but also contributes to its functionality. The rugged exterior is built to withstand the rigors of touring and frequent setup changes, while the user-friendly features make installation and operation straightforward, even for those with minimal technical expertise.

In summary, the Electro-Voice MA-1212 is a powerful and adaptable loudspeaker that combines advanced technology and durability. Whether its role is in a permanent installation or on the road for an event, the MA-1212 delivers exceptional audio performance, satisfying the demands of sound professionals and enhancing the overall listening experience.
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