Input/Output Connections, Gain Control

Input/Output Connections

The active MD has a balanced 3-pin female XLR input marked IN and a male XLR output con- nector marked OUT. These connectors are wired in parallel, enabling connection of multiple enclosures in a “daisy-chain” fashion.

Balanced connections are recommended for less AC hum and interference, especially with long cable runs. Unbalanced connections may be suitable for short cables. The signal's source impedance should be less than 600 ohms.

Input connection

Insert the male XLR input into the jack marked IN. Ensure the connector is fully seated. The input impedance is 12k ohm balanced or 6k ohm unbalanced.

Balanced inputs: Connect to the plug as shown.

1= shield (ground)

3= minus (-) 2= plus (+)

Input (IN) and Output (OUT) Connectors

Unbalanced inputs: Connect to the plug as shown. Pin 3 and pin 1 must be connected with a jumper as shown.

1= shield (ground)

3= jumper to pin 1 2= plus (+)

Output Connection

Insert the female XLR connector into the jack marked OUT. Connect the other end of the cable to the next down-stream audio device’s input connector.

Gain Control

The Gain control is recessed and can be adjusted with a small screwdriver or flat tool. Turn the gain control clockwise to increase gain and counter clockwise to decrease gain. The attenuation in dB (from maximum) is shown on the label.

The Gain control is marked in dB of attenuation. There are 21 detents for repeatable adjust- ments. The upper 14 steps are about 1 dB each, and settings should normally be made within this range. The range below -14 dB should not be used for normal program levels, as the input headroom could be exceeded, but can be used for testing at reduced levels. At the minimum setting, the signal is completely cut off.

Filter Select Switch

Above the Gain control is a small toggle switch that selects either Full Range operation or applies a 100 Hz Lo-Cut filter to the system.

Full Range Setting

Use the Full Range setting for applications without subwoofers or dedicated low-frequency enclosures.

100 Hz Lo-Cut Setting

Use the 100 Hz Lo-Cut setting for applications with optional subwoofers or low-frequency sys- tems.

The two-way wedge will have its low-frequency content below 100 Hz filtered at 24dB per octave, yielding less distortion at low frequencies and provide improved clarity in the mid-fre- quencies.

Filter Select Switch

Gain Control

MD-FP122/64r, MD-FP122/94r specifications

QSC Audio has long been recognized for its commitment to delivering innovative audio solutions tailored for professional applications. Among its standout offerings are the MD-FP122/94r and MD-FP122/64r loudspeakers, both of which are designed to meet the rigorous demands of live sound reinforcement and installation projects.

At the core of these models is their exceptional acoustic design. The MD-FP122/94r features a 12-inch low-frequency driver complemented by a 1.75-inch high-frequency compression driver mounted on a unique waveguide. This configuration allows the speaker to deliver impressive clarity, depth, and coverage, making it highly effective for both live performances and permanent installations. The MD-FP122/64r, while sharing a similar foundation, is optimized for different applications, featuring a 64-degree dispersion pattern that enhances audience coverage within various venue sizes.

Both models utilize advanced materials in their construction, ensuring durability without compromising audio quality. The enclosures are built using high-density plywood that minimizes unwanted resonance and vibration, resulting in clearer sound reproduction. Additionally, both speakers come equipped with a robust, weather-resistant finish, allowing them to withstand the rigors of outdoor environments.

The MD-FP series also supports QSC’s proprietary technology, including their PowerWave™ design. This sophisticated approach maximizes the efficiency of the low-frequency driver, providing enhanced power handling and extending overall performance. Dynamic range is also optimized, allowing users to experience a full spectrum of audio, from the softest whispers to the most thunderous bass.

The integration of user-friendly features further enhances the versatility of the MD-FP122/94r and MD-FP122/64r. These speakers include multiple mounting options to accommodate various installation scenarios, making them suitable for both portable and fixed applications. Additionally, the models are designed to work seamlessly with QSC's Digital Signal Processors (DSP), allowing for tailored tuning to meet specific acoustic needs and ensuring optimal performance across different settings.

In summary, QSC Audio's MD-FP122/94r and MD-FP122/64r loudspeakers exemplify high-quality design and innovative technology. With their powerful performance, durable construction, and versatile application possibilities, these models represent an excellent choice for audio professionals seeking reliable and high-fidelity sound reinforcement. Whether for touring events or permanent installations, they provide the level of performance required to elevate any audio experience.