QSC Audio MX 1500a, MX2000a, MX3000a owner manual III. Inputs, MX 1000a Inputs

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III. INPUTS

An MXa amplifier features balanced inputs, connected via barrier strip terminals or 1/4” (6.3 mm) tip/ring/sleeve phone jacks. The tip of the input jack is wired for “nega- tive’ or inverted polarity, while the ring is the non-inverting input. Thus, if the voltage at the tip is positive with respect to that at the ring, the amplifier channel will produce a negative voltage at its output.

For use with unbalanced signals, connect the unused terminal to ground to avoid a reduction in gain caused by a floating input; use a two-conductor (tip/sleeve) plug, or connect a jumper between the inverting input terminals on the barrier strip and their adjacent ground terminal.

MX 1000a INPUTS

The amplifier’s input sensitivity is 1.1 volt rms; at this signal level and input attenuators set for full gain, the amplifier will produce full rated power—250 watts, 20Hz- 20kHz, 0.1% THD—into an 8-ohm load. The input imped- ance is 20 kilohm balanced and 10 kilohm unbalanced, typical of QSC amplifiers.

MX 1500a INPUTS

The amplifier’s input sensitivity is 1.07 volt rms; at this signal level and any attenuators set for full gain, the amplifier will produce full rated power—350 watts, 20Hz- 20kHz, 0.1% THD—into an 8-ohm load. The input imped- ance is 20 kilohm balanced and 10 kilohm unbalanced, typical of QSC amplifiers.

MX 2000a INPUTS

The amplifier’s input sensitivity is 1.05 volt rms; at this signal level and any attenuators set for full gain, the amplifier will produce full rated power—450 watts, 20Hz- 20kHz, 0.1% THD—into an 8-ohm load. The input imped- ance is 20 kilohm balanced and 10 kilohm unbalanced, typical of QSC amplifiers.

MX 3000a INPUTS

The amplifier’s input sensitivity is 1 volt rms; at this signal level and any attenuators set for full gain, the amplifier will produce full rated power—800 watts, 20Hz-20kHz, 0.1% THD—into an 8-ohm load. The input impedance is 20 kilohm balanced and 10 kilohm unbalanced, typical of QSC amplifiers.

An MXa Series amplifier features a Level I Open Input Architecture slot. See Section 2 for more information about Open Input Architecture.

 

WARNING: TO REDUCE THE RISK OF FIRE

 

 

OR ELECTRIC SHOCK, DO NOT EXPOSE THIS

 

 

EQUIPMENT TO RAIN OR MOSTURE.

 

 

TIP NEG RING POS

CH 2

INPUT

CH 1

TIP NEG RING POS

 

SLEEVE GND

SLEEVE GND

 

 

 

 

 

STEREO

CH 2

+

– GND –

+

CH 1 PARALLEL

BRIDGE

 

– BRIDGED MONO –

+

+

CHANNEL 2

CHANNEL 1

– –

STEREO 4 OHM MIN/CH. CLASS 2 WIRING

BRIDGED MONO 8 OHM MIN. CLASS 1 WIRING MUST BE USED BRIDGED MONO OPERATION: PLACE BRIDGING SWITCH ON INPUT PANEL

TO BRIDGED POSITION. CONNECT INPUT SIGNAL TO CH 1 ONLY. CONNECT SPKR (+) TO CH 1 (+) OUTPUT. CONNECT SPEAKER (–) TO CH 2 (+) OUTPUT. SET CH 2 GAIN FULLY CLOCKWISE AND REGULATE LEVEL WITH CH 1 GAIN CONTROL.

A U D I O

AVIS

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Figure 3: QSC MX 1500a Back Panel (identical to the MX 1000a)

 

WARNING: TO REDUCE THE RISK OF FIRE

 

 

OR ELECTRIC SHOCK, DO NOT EXPOSE THIS

 

 

EQUIPMENT TO RAIN OR MOSTURE.

 

 

TIP NEG RING POS

CH 2

INPUT

CH 1

TIP NEG RING POS

 

SLEEVE GND

SLEEVE GND

 

 

 

 

 

STEREO

CH 2

+

– GND –

+

CH 1 PARALLEL

BRIDGE

A U D I O

 

– BRIDGED MONO –

+

+

CHANNEL 2

CHANNEL 1

–

–

STEREO 4 OHM MIN/CH. CLASS 2 WIRING

BRIDGED MONO 8 OHM MIN. CLASS 1 WIRING MUST BE USED BRIDGED MONO OPERATION: PLACE BRIDGING SWITCH ON INPUT PANEL

TO BRIDGED POSITION. CONNECT INPUT SIGNAL TO CH 1 ONLY. CONNECT SPKR (+) TO CH 1 (+) OUTPUT. CONNECT SPEAKER (–) TO CH 2 (+) OUTPUT. SET CH 2 GAIN FULLY CLOCKWISE AND REGULATE LEVEL WITH CH 1 GAIN CONTROL.

AVIS

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Figure 4: QSC MX 2000a Back Panel (identical to the MX 3000a)

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Contents Owner’s Manual B L E O F C O N T E N T S Safeguards Rack Mounting PrecautionsPrecautions Speaker DamageQSC MX 1500a Front Panel identical to the MX 1000a II. Overall DescriptionMX 1000a Inputs III. InputsIV. Outputs AC PowerOperations Controls and DisplaysTroubleshooting Model SpecificationsOpen Input Architecture Level WeightLeft side of rear panel PARALLEL, STEREO, or Bridged OperationInstructions for Bridged Operation Ohm Loads VI. LONG-TERM Output PowerAC Current Consumption Heat Emissions Load Power, both channels Idle, both channelsProtection Circuits BTU/hr Kcal/hr MX 1000aVIII. Technical Assistance & Service VII. Warranty DisclaimersInternational Servicing Qualified Service CentersIX. QSC Online USA Important Address and Telephone InformationD I O

MX2000a, MX 1000a, MX 1500a, MX3000a specifications

The QSC MX series amplifiers, including the MX3000a, MX1500a, MX1000a, and MX2000a, are designed to deliver outstanding audio performance, making them popular choices in both professional audio and live sound environments. Each model combines high-quality components with innovative technologies, ensuring reliability and consistency in sound reproduction.

The MX3000a stands out with its powerful output, featuring an impressive peak power of 3000 watts at 4 ohms. It excels in larger venues, providing the headroom needed for demanding audio applications. The amplifier is equipped with advanced thermal management technology and a built-in limiter to ensure safe operation under heavy loads, automatically adjusting output levels to prevent distortion and potential damage to connected speakers.

The MX1500a is an ideal choice for mid-sized applications, delivering 1500 watts at 4 ohms. This model incorporates QSC’s rugged construction, featuring a sturdy chassis and efficient heat dissipation to withstand the rigors of professional use. With its versatile input options, including XLR and quarter-inch connectors, the MX1500a can easily integrate into various audio setups, making it suitable for both live sound reinforcement and permanent installations.

For more compact needs, the MX1000a provides 1000 watts of power at 4 ohms while maintaining exceptional sound clarity. Its lightweight design and efficient power supply make it easy to transport, catering to mobile DJs, small bands, and corporate events. The MX1000a includes a comprehensive set of LED indicators for power, signal, and clipping, allowing users to monitor performance easily.

Lastly, the MX2000a offers a versatile solution with 2000 watts of output at 4 ohms. This amplifier features a high-performance class-H design, ensuring minimal heat generation and improved efficiency. Its dual-channel configuration allows for flexibility in powering two separate speaker systems or bridging the channels for a single high-power output.

All models in the QSC MX series emphasize durability, high-quality sound, and flexible connectivity, making them suitable for a wide range of professional audio applications. With built-in protection circuits, efficient cooling systems, and ease of use, the MX series amplifiers are trusted by audio professionals for their reliability and performance, ensuring that they meet the demands of any event or installation.
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