Electro-Voice Comprehensive Guide to Professional Power Amplifiers: Q1212, Q66, Q44 & Q99

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PROFESSIONAL POWER AMPLIFIER

2.6 Groundlift

The ground lift switch allows for eliminating noise loops. When operating the power amplifier together with other equipment in a rack case, setting the switch to the GROUNDED position is recommended. Set the switch to UNGROUNDED, when the power amplifier is operated together with appliances with differing ground potentials.

2.7 LPN-Filter

The patented LPN (Low-pass notch) filter corrects the frequency and phase response of the connected loudspeakers. This effect can not be reached using equalizers or „Bass-Boosters”, because the LPN filter mainly optimizes the rise time of the audio signal. Switch the filter ON or OFF for evaluation of the actual effect that the filter has on the sound. The sound is getting more powerful, especially when using fullrange speakers (e.g. 12/2, 15/2) or subwoofers. For large systems (e.g. controlled via EV‘s DC-One) using the LPN filter is not recommended.

2.8 Selecting the Mode Of Operation and Audio Output Cabeling

The MODE switch on the power amp‘s rear panel defines how the audio inputs handle the input signals. Possible settings are DUAL, PARALLEL or BRIDGED.

DUAL

In DUAL mode, the two channels of the power amplifier work independent from each other. This mode of operation is being used for all 2-channel applications, like stereo operation. Using the input level controls on the power amp’s front panel allows independently adjusting the channels’ amplification.

PARALLEL

In PARALLEL mode, the inputs of channel A and channel B are directly electrically linked. The audio signal has to be applied to the input connectors of channel A. Using the input level controls to independently control the amplification of the two channels is still possible because only the channels’ inputs are linked. PARALLEL operation is the mode of choice, whenever the same input signal drives multiple power amp channels of a large system installation.

CAUTION:

In PARALLEL mode, the input signal has to be fed to input channel A only.

Typical Speaker System Cabling

The first possibility in DUAL or PARALLEL mode is to use the two Speakon-type connectors, whereas speakers have to be connected to pins 1+ and 1– of the sockets. The correct connection is also indicated at the amplifiers rear panel.

Bi-Amp Cabling

The second possibility for connecting the speakers when the power amplifier is operated in DUAL or PARALLEL mode is to

only use the Speakon-type connector CHANNEL A and to connect one speaker cabinet to pins 1+ and 1–, as described above and the second cabinet to pins 2+ and 2– as shown in illustration. Only pins 2+ and 2– of the Speakon CHANNEL A connector are assigned. Proceeding like this facilitates the cabling of speaker systems that are used in active 2-way operation (Bi-

Amp). The correct connection is also indicated at the amplifiers rear panel.

Owner‘s Manual 9

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Contents Page Page Professional Power Amplifier Owner‘s Manual Important Safety InstructionsIntroduction Professional Power Amplifier Controls, Indicators and Connections InstallationFront View Rear ViewOperating Voltage Mains SwitchMounting VentilationSelecting the Mode Of Operation and Audio Output Cabeling GroundliftLPN-Filter Anschluss Belegung Speakon Channel B Speakon Channel a ConnectorIllustration 2.3 Balanced connection of output Daisy-Chain Operation Volume ControlIndications FAN CoolingProfessional Power Amplifier Specifications/Technische Daten Bedienungsanleitung Hinweise zur Entsorgung/Wiederverwendung gemäß Weee Wichtige SicherheitshinweiseBeschreibung Bedienelemente, Anzeigen und Anschlüsse FrontseiteRückseite Netzschalter BetriebsspannungEinbau KühlungLPN-Filter Low-Pass-Notch Betriebsart Mode und Verkabelung des Audio-AusgangsTypische Lautsprecherverkabelung Speakon Channel B Speakon Channel a Anschluss BelegungAbbildung 2.1 Symmetrische Beschaltung des Eingangs Eingangspegel-Regler BetriebAnzeigen LüfterQ44 Q66 Q99 Q1212 Specifications/Technische DatenBlock Diagram / Blockschaltbild Dimensions / Abmessungen Professional Power Amplifier Professional Power Amplifier Americas

Q99, Q1212, Q44, Q66 specifications

Electro-Voice is well-recognized in the audio industry for its innovative and high-quality sound reinforcement products. Among their impressive lineup, the Q series amplifiers—namely the Q44, Q66, Q1212, and Q99—stand out for their performance, durability, and versatility.

The Q44 is a reliable choice for smaller venues, featuring a lightweight design combined with a high output power of 800 watts per channel at 4 ohms. This amplifier utilizes advanced technology such as a switch-mode power supply, which enhances efficiency and reduces heat generation. The Q44 is ideal for driving passive loudspeakers, offering robust low-frequency response, and is equipped with sophisticated protection circuits to prevent damage from overload or short circuits.

The Q66 builds on the foundation of the Q44, providing higher output power at 1,000 watts per channel at 4 ohms. It is designed for medium-sized applications, whether they are live events, installations, or corporate audiovisual setups. The Q66 features a subwoofer crossover built into the device, facilitating a seamless integration of sub-bass frequencies without the need for external processing. Additionally, the amplifier's sleek front panel provides clear wattage meters and consistent feedback on performance.

For more extensive and complex sound systems, the Q1212 is a powerhouse, delivering up to 1,200 watts per channel at 4 ohms. This model boasts extensive connectivity options, including balanced XLR inputs and speakON outputs, catering to professional setups requiring flexibility. Its advanced thermal management systems ensure operational stability even in demanding environments, making it suitable for large-scale concerts and events.

The Q99 rounds out the series with a compact design that does not compromise on power. With an output of 900 watts per channel at 4 ohms, it provides ample power for various applications. Its lightweight and rack-mountable structure make the Q99 an excellent choice for mobile DJs and touring professionals. The built-in signal indicators and protection features ensure longevity and reliability, critical for on-the-go performance.

All models in the Electro-Voice Q series employ sophisticated Class-D amplification technology, notable for its high efficiency and low thermal output. This technology not only ensures clean and powerful sound but also enhances portability—making them ideal companions for both installation and live sound scenarios. With their various power outputs and features, the Q series offers a comprehensive solution for audio professionals looking to achieve exceptional sound quality.