SYSTEM OPERATION AND SETUP

Powering the MPA-400

Turn on the unit using the Power ON Switch (9). The Power ON LED

(12)indicating the MPA-400 is receiving power. The MPA-400 is powered internally by the 12V/3.3A rechargeable battery. A fully charged battery can power the unit for up to 2 hours of normal operation. The unit will start charging the internal battery automatically when on; or when the internal rechargeable battery is low. When charging, the Charging ON LED (11) will remain lit.

(Note: To avoid damaging your unit, use only the provided AC cord connected to the power input socket.)

When the Low Battery ON LED (10) is on, this means the MPA-400 needs to be charged as soon as possible. When charging, the LED remains red. When charging is complete, the LED turns Green. For op- timum use, the MPA-400 should be fully charged each time. Disconnect the AC cord when charging is complete.

(Note: Do not turn off the MPA-400 Power ON Switch until the Battery charging LED ON indicator lights green, the battery is fully charged and ready to power the MPA-400 alone. Shut off the Power ON Switch and disconnect the AC cord. If the unit is not to be used for a long period of time, make sure the battery is fully charged before put it away for next use.)

(Note: When the Charge ON LED is not turns Green or the operating hours is noted less, the internal battery might need replacing.)

External Power for Charger

Plug the external provided power cord into AC Input Socket (13). Then plug the AC plug into a standard 115VAC or 240VAC outlet (The AC adapter will detect the Line Voltage Automatically).

External 12V DC Supply

The MPA-400 can be powered externally supply via the External DC +12V DC Input Terminal (8). Connect the external power supply wires to the two input terminals, observing the correct polarity as marked. The power source should provide 12VDC at current 3A or higher. The 3A Fuse (7) is used to protect power the unit overloading. Should the fuse burn, replace with the same type SB (Slow-Blow).

(Note: External 12V DC Supply will not charge the internal rechargeable battery.)

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WIRED AND WIRELESS OPERATION

WIRED OPERATION

The front panel has 1x ¼” input jack for connecting a wired microphone. Doing so will disconnect the wireless microphone audio and allow wired microphone use only.

•Plug wired microphone into ¼” input (MIC IN) with XLR-1/4” cable

•Make any necessary adjustments to Mic level and Tone

•“MIC/WIRELESS” adjusts the input sensitivity.

NOTE: The gain knob can be used to avoid distortion and feedback. It is best to begin with the gain lower and increase as needed.

•“TONE” adjusts the bass and treble. Top center produces flat operation (no EQ).

-Turning the knob to the right increases the treble and reduces the bass. -Turning the knob to the left increases the bass level and reduces the treble.

•If feedback occurs, first try turning down the Tone control (4) to MIN. If feedback still is present, try turning down the Wire/Wireless Mic Volume Control (5) or repositioning the MPA-400 with respect to the wired or wireless Mic being used.

Note: Microphone elements can easily be destroyed by the buildup of salts and minerals from perspiration and saliva. It is good practice to place a windscreen on the mic at all times.

WIRELESS OPERATION

•Unscrew the battery compartment cover end cap (14) and remove, exposing the battery compartment. Insert a fresh 9V alkaline battery, observing polarity. Replace the battery cover.

•Turn on the microphone power switch (15) on the handle of the microphone. The battery indicator LED (16) will give a single quick flash, indicating usable battery strength. In the case of a dead or low battery, the indicator will either not go on at all or will stay on continuously, indicating a need to replace the battery. To preserve battery life, turn the transmitter off when not in use.

•If there is no audio, check that the Power Switch (15) is not on MUTE/Standby - second position.

•Adjust the volume of the MPA-400 to the desired level.

•Extend the Wireless Mic Receiver Antenna (1) fully whenever using the wireless microphone to ensure optimum performance and maximum range.

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Nady Systems owner manual Powering the MPA-400, Wired Operation, Wireless Operation
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MPA-400 specifications

The Nady Systems MPA-400 is a versatile and powerful multi-channel amplifier designed for a wide range of applications in both live sound and installation scenarios. With its robust construction and innovative technology, the MPA-400 meets the demands of professional users seeking reliable performance and audio quality.

One of the standout features of the MPA-400 is its four-channel design, allowing it to drive multiple speaker systems simultaneously. Each channel is independently adjustable, which provides users with the flexibility to tailor the output to suit various speakers and acoustic environments. The amplifier delivers a total output power of 400 watts, ensuring ample headroom for dynamic performances and events.

The MPA-400 incorporates advanced cooling technology, including internal fans that maintain optimal operating temperatures. This feature not only extends the lifespan of the unit but also ensures consistent performance during extended use. The weighted internal components are designed to minimize noise interference, contributing to the unit’s clean and clear audio output.

In terms of connectivity, the MPA-400 offers a comprehensive array of options. It includes balanced XLR inputs for professional-grade microphones and instruments, as well as RCA inputs for connecting consumer audio devices. The outputs provide compatibility with a range of speaker configurations, making it suitable for both passive and active monitoring systems.

The amplifier is engineered with a built-in limiter, which prevents peak overload while maintaining signal integrity. This safeguard is especially beneficial in live sound applications, where sudden volume spikes can lead to distortion or speaker damage. Additionally, the unit features LED indicators for signal presence and clipping, allowing users to monitor performance at a glance.

Portability is another significant advantage of the MPA-400. Its compact chassis and lightweight design enable easy transportation, making it an ideal choice for mobile DJs, bands, and sound reinforcement professionals. The rugged construction ensures it can withstand the rigors of frequent travel and setup.

Overall, the Nady Systems MPA-400 stands out in the crowded field of audio amplifiers thanks to its power, flexibility, and reliability. Whether for live performances, recording sessions, or public address use, the MPA-400 provides an exceptional solution for elevating sound quality and delivering exceptional audio experiences. Its combination of features and technologies makes it a valuable asset for any audio professional.
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