Bridging Precautions

Use extreme caution when operating the amplifier in the bridged mode; as potentially lethal voltage may be present at the output ter- minals. Never ground either side of the speaker cable when the amplifier is in the bridged mode; both sides are hot. If an output patch panel is used, all connections must be isolated from each other and from the panel. The recommended minimum nominal load imped- ance in the bridged mode is 4Ω (equivalent to driving both channels at 2Ω ). Driving bridged loads of less than 4Ω will activate the IGM circuitry resulting in a loss of power, and may also cause a thermal overload.

Connecting amplifier outputs to oscilloscopes or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test equipment!

Switches & Controls

AC Power Switch/Circuit Breaker

The Professional Series amplifiers have a combination AC switch/circuit breaker on the front panel. If the switch shuts off during nor- mal use, push it back to the ON position once. If it will not stay on, the amplifier needs servicing. The 10001 has two AC switch/cir- cuit breakers (one for each channel); the 10004 has two, one for each twin-channel amp.

Input Attenuators

Whenever possible, set the attenuators fully clockwise to maintain optimum system headroom. The input attenuator controls (one for channel A, one for channel B) located at the front panel adjust gain for their respective amplifier channels in all modes. See the spec- ifications at the end of this manual for standard voltage gain and input sensitivity information.

When operating a Professional Series amplifier in the bridged mode, both attenuators must be in the same position so the speaker load will be equally shared between the channels. See the section on Bridged Mono Operation for more information and precautions.

Note: on the Model 7301, channel attenuators are labeled "LOWS" and "HIGHS", corresponding to the low and high frequency mon- itor output channels.

Mode Select Switch

The rear panel Mode Select Switch determines whether the amplifier is in the stereo, parallel, or bridged mono mode. Do not operate the Mode Select Switch with the amplifier powered on. See the sections on Stereo and Bridged Mono Mode for more information.

Note: On the 10004 model, there are two Mode Select Switches on the rear panel. The Model 7301 power amplifier does not have a Mode Select Switch. For more information, see the Model 7301 section.

Signal Ground Lift Jumper

In a properly designed system (for safety and to minimize noise), the amplifier should receive its ground from the AC line cord. Whenever possible, the signal source equipment should share the same AC ground as the amplifier(s). In some cases, however, this may result in a ground loop. If this happens, remove the ground lift jumper (supplied) on the rear barrier strip. This jumper electrically con- nects the signal ground (Pin 2) to the chassis/AC ground (Pin 1). If the jumper is removed, the signal ground is lifted and completely isolated from the chassis/AC ground. Do not remove the jumper if the amplifier and the signal source equipment are not on the same AC ground.

Note: On the Model 10004 power amplifier, there are two (2) signal ground lift jumpers.

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Crest Audio Pro Series Power Amplifiers

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Crest Audio Stereo Amplifier owner manual Bridging Precautions, Switches & Controls
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Stereo Amplifier specifications

The Crest Audio Stereo Amplifier has established a notable reputation in the audio industry, particularly among professionals seeking dependable and high-performance amplification solutions. Renowned for its robustness and exceptional sound quality, this amplifier is a popular choice for both live sound applications and studio settings.

One of the standout features of the Crest Audio Stereo Amplifier is its outstanding power output, which ensures that it can drive a wide range of loudspeakers with ease. Typically available in various power ratings, these amplifiers can provide significant wattage, allowing them to handle high-demand audio situations without distortion. This makes the Crest Audio amplifier an excellent choice for large venues, theaters, and event spaces.

The design of the Crest Audio Stereo Amplifier prioritizes efficiency and performance. Utilizing high-quality components, the amplifier is constructed with a rugged chassis and offers extensive heat dissipation to ensure longevity and reliability during prolonged use. This durability is particularly crucial in professional settings where equipment is often subjected to rigorous conditions.

In terms of technology, Crest Audio amplifiers incorporate advanced circuitry that enhances audio fidelity and minimizes noise. The use of Class AB amplification technology allows for a balanced performance that delivers both output power and audio clarity. This technology enables the amplifier to produce rich, warm tones, making it particularly effective for musical genres requiring dynamic range and precision, such as classical and jazz.

Another notable characteristic of the Crest Audio Stereo Amplifier is its comprehensive protection features. These amplifiers are designed with built-in thermal, short circuit, and overload protection, ensuring that the equipment can withstand potential hazards without compromising performance. The intuitive LED indicators provide visual feedback on the status of the amplifier, allowing users to monitor operation easily.

Connectivity is another essential factor, with Crest Audio amplifiers typically featuring a variety of input and output options. This flexibility enables integration with different audio systems, whether for simple stereo setups or complex multi-channel configurations. The professional-grade speakON and binding post outputs ensure secure connections to loudspeakers, promoting optimal performance.

Overall, the Crest Audio Stereo Amplifier is a reliable, high-performance solution for any audio professional. With its powerful output, sturdy construction, advanced technology, and user-friendly features, this amplifier continues to be a top choice for delivering exceptional sound quality in various applications. Whether in a studio environment or a live concert setting, the Crest Audio Stereo Amplifier stands out as a trusted tool for achieving audio excellence.
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