Micro-Tech Series Power Amplifiers

6 Principles of Operation

To further protect the output stages, the pat- ented ODEP circuitry is used. It produces an analog output proportional to the always changing die temperature of the output transis- tor. This output controls the translator stage previously mentioned, removing any further drive that may exceed the safe operating area of the output stage.

Thermal sensors S100 and S200 give the ODEP circuits vital information on the operat- ing temperature of the heat sink on which the output devices are mounted.

Should the amplifier fail in a way that would cause DC across the output lead, the DC pro- tection circuit senses this on the negative feed- back loop and shuts down the output stage drive until the DC is removed.

6.2.2 Bridge-Mono Operation

By setting the back panel stereo/mono switch to Bridge-Mono, you can convert a Micro-Tech amplifier for bridged-mono operation. With a signal applied to the channel 1 input and the load connected between the positive (+) output terminals, twice the voltage can be delivered to the load.

The channel 1 output feeds the channel 2 error amp U204-A. The signal feeding channel 2 is inverted so the channel 2 output will have the

opposite polarity of channel 1. This makes it possible to deliver twice as much voltage to the load while the protection mechanisms for each channel continue to work independently.

6.2.3 Parallel-Mono Operation

With the stereo/mono switch set to Parallel- Mono, the output of channel 2 is paralleled with that of channel 1. A suitable jumper capable of handling high current must be connected across the positive (+) output terminals to gain the benefits of this operating mode.

The signal path for channel 1 is the same as previously discussed, except that channel 1 also drives the output stage of channel 2. The balanced input, error amp, translators, and LVAs of channel 2 are disconnected and no longer control the channel 2 output stage. The channel 2 output stage and protection mecha- nisms are also coupled through S1 and func- tion as one.

In Parallel-Mono mode, the amplifier can deliver twice the current of a single channel. Because the channel 2 ODEP circuit is coupled through S1, the amplifier gains additional pro- tection if a fault occurs in the channel 2 output stage. The channel 2 ODEP circuit will limit the output of both output stages by removing the drive from the channel 1 voltage translator.

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Operation Manual

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Crown Audio MT-601, 1201, 2401 operation manual Bridge-Mono Operation, Parallel-Mono Operation
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MT-601, 1201, 2401 specifications

Crown Audio is synonymous with high-performance amplifiers, and their models 1201, 2401, and MT-601 embody the brand's commitment to quality and reliability in sound reinforcement. Each model caters to different needs, making them valuable assets in live sound and installation applications.

The Crown 1201 amplifier is designed for versatility, providing 120 watts per channel at 8 ohms. This model features Crown's patented "Power Factor Control," which ensures maximum power delivery with minimal distortion and heat generation. The 1201 is lightweight yet rugged, making it ideal for portable applications. It's equipped with comprehensive protection circuitry, including short circuit and thermal protection, safeguarding both the amplifier and connected speakers.

Moving to the Crown 2401, it ups the power with 240 watts per channel at 8 ohms. The 2401 also employs Crown's advanced input circuitry, which enhances audio clarity and reduces noise. Its design includes an intelligent cooling system with variable-speed fans, accommodating demanding situations while ensuring quiet operation. The amplifier's robust build quality and efficient power usage make it a favorite among sound engineers who require both reliability and performance.

The MT-601 is a versatile addition to Crown's lineup, known for its flexibility in various applications. Delivering 300 watts per channel at 8 ohms, the MT-601 features an advanced monitoring system that provides real-time feedback on system performance. This capability allows sound technicians to make adjustments on the fly, optimizing sound quality. The MT-601's lightweight chassis and modern design make it easy to integrate into any setup.

All three models embody Crown Audio's dedication to innovation through technologies such as output peak limiter and gain monitoring, which prevents signal clipping and distortion. They also feature variable-speed cooling fans that adapt based on the amplifier's thermal load, ensuring efficiency without compromising performance.

In summary, Crown Audio’s 1201, 2401, and MT-601 amplifiers showcase the brand’s expertise in delivering powerful, reliable audio solutions. With their unique features, robust build quality, and advanced technologies, these amplifiers meet the diverse needs of both live performance environments and fixed installations, making them an ideal choice for audio professionals.
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