Electro Voice Q66, Q44, Q1212, and Q99 Manual - Professional Power Amplifiers

PROFESSIONAL POWER AMPLIFIER

3 Operation

3.1 Volume Control

In DUAL and PARALLEL mode, the level controls CH A and CH B on the power amp’s front panel are used to control the amplification of the corresponding channel. Turning the control to the right increases and turning it to the left decreases the volume. In BRIDGED mode operation, the output volume of the power amp is only controlled by the CH A level control. Any changes in the setting of the CH B level control are ignored.

3.2 Indications

PROTECT

The PROTECT LED lights indicating that one of the internal protection circuits against thermal overload, short-circuit, Back-EMF, HF-occurrence at the output, etc., has been activated. In that case, the output relays separate the power amps from the load connected to prevent the connected loudspeaker systems and the power amplifiers as well from being damaged. Whatever caused the fault – e.g. a short-circuited speaker cable – needs to be removed. In case of thermal overload you have to wait until the power amplifier cools down and automatically regains normal operation.

-40dB...LIMIT

Level indication is realized via vertical LED chains on the power amp’s front panel that individually indicate the actual levels of each channel at -40dB, -30dB, -20dB and -10dB below full modulation and 0dB as soon as full modulation is reached. 0dB indication results from comparing the power amp‘s internal ratio of input to output voltage, which ensured precise indication of the full modulation limit, even before limiting becomes audible. The LIMIT LED lights as soon as the integrated dynamic audio limiter is activated and the power amplifier is driven at the clipping limit or generally at its maximum capacity. Short-term blinking is not a problem, because the internal limiter controls input levels of up to +21 dBu down to a THD of approximately 1 %. If, on the other hand, the LIMIT LED light constantly, reducing the volume is recommended to prevent the loudspeaker systems connected from being damaged by probable overload.

POWER

The POWER LED lights green when the power amplifier is on. If the POWER-LED does not light, despite the fact that the amplifier has been switched on, this indicates that the power amp is not connected to the mains or the primary fuse has blown.

3.3 FAN Cooling

The power amplifier has two fans. The fans are switched in three performance-optimized levels, i.e. they are not running permanently but the speed of the fans is controlled depending on the ambient temperature. That in return ensures very silent running during idle state. The temperatures of the power amps‘s channels are registered and monitored separately.

12 Owner‘s Manual

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.