Studio Reference I & II Professional Studio Amplifiers

4 Operation

4.1 Precautions

Although your amplifier is protected from internal and external faults, you should still take the following pre- cautions for optimum performance and safety:

1.Improper wiring for the Stereo, Bridge-Mono or Parallel-Mono modes can result in serious operat- ing difficulties (see Sections 3.3.1 through 3.3.3).

2.When driving an inductive load like an electrostatic loudspeaker, use a high-pass filter or protective network to prevent premature activation of the amplifier’s protection circuitry (see Section 3.3.4).

3.WARNING: Do not change the position of the ste- reo/mono switch unless the amplifier is first turned off.

4.CAUTION: In Parallel-Mono mode, a jumper must be installed between the channel 1 and 2 red (+) binding post outputs. Be sure to remove this jumper for Stereo or Bridge-Mono modes, otherwise high distortion and excessive heating will occur. Check the stereo/mono switch on the back panel for proper position.

5.Turn off the amplifier and unplug it from the AC mains before removing the amplifier’s P.I.P. mod- ule or dust filter.

6.Use care when making connections, selecting sig- nal sources and controlling the output level. The load you save may be your own!

7.Do not short the ground lead of an output cable to the input signal ground. This will form a ground loop and may cause oscillations.

8.Operate the amplifier from AC mains of not more than 10% above or below the selected line voltage and only at the rated line frequencies.

9.Never connect the output to a power supply output, battery or power main. Such connections may re- sult in electrical shock.

10.Tampering with the circuitry by unqualified person- nel, or making unauthorized circuit changes may be hazardous and invalidates all agency listings.

Remember: Crown is not liable for damage that results from overdriving other system components.

4.2 Indicators

The front panel has several helpful indicators. The en- able indicator is provided to show the amplifier has been turned on (or enabled) and that its low-voltage

Fig. 4.1 Indicators

power supply and on-demand forced air cooling sys- tem are working. It does not indicate the status of the high-voltage power supplies. For example, the enable indicator will stay on in the improbable event that one or both channels overheat causing an internal shut down of the high voltage supplies.

The green ODEP indicators confirm the normal opera- tion of Crown’s patented Output Device Emulation Pro- tection circuitry. During normal operation, they glow brightly to confirm the presence of reserve thermody- namic energy. They dim proportionally as the energy reserve decreases. In the rare event that there is no reserve, the indicators will turn off and ODEP will pro- portionally limit the drive level of the output stages so the amplifier can continue safe operation even when the operating conditions are severe. (For a more de- tailed description of ODEP, see Section 4.3.1.)

A channel’s ODEP indicator also turns off if its high- voltage power supply is put in “standby” mode or the amplifier’s circuit breaker is tripped. The standby mode is activated if DC or heavy common-mode cur- rent is detected in the output, if the transformer thermal protection system is activated, if a P.I.P. like the Smart Amp IQ-P.I.P. is used to shut down a high-voltage sup- ply, or if excessive AC mains voltage is detected. For more information see Section 4.3 and the table in Fig- ure 4.2.

The yellow IOC indicators act as sensitive distortion meters to provide proof of distortion-free performance. The IOC (Input/Output Comparator) circuitry compares the incoming signal’s waveform to that of the output. Any difference between the two is distortion. The IOC indicators flash if there is a difference of 0.05% or more. The IOC indicators also show input overload by flashing brightly with a half-second hold delay. It is nor- mal for them to light momentarily when the amplifier is first turned on. Note: The channel 2 IOC indicator will stay on in Parallel-Mono mode. Also, an IOC indicator will stay on in abnormal situations where a high-voltage power supply is temporarily put in standby mode.

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Crown Audio STUDIO AMPLIFIER owner manual Operation, Precautions, Indicators
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STUDIO AMPLIFIER specifications

Crown Audio, a leader in professional audio solutions, has long been renowned for producing high-quality amplifiers, and their Studio Amplifier series exemplifies this reputation. The Crown Studio Amplifier is meticulously engineered for audiophiles and professionals seeking excellence in sound reproduction, characterized by its superior performance, reliability, and advanced features.

At the heart of the Crown Studio Amplifier lies its robust power output, designed to deliver pristine audio quality at high volumes without distortion. With various models available, users can choose from a range of power ratings, ensuring they have the right amount of amplification for their specific needs. This versatility makes the amplifier suitable for various applications, including recording studios, live sound environments, and high-fidelity home listening.

One of the standout features of the Crown Studio Amplifier is its advanced signal processing technology. The unit includes built-in DSP (Digital Signal Processing), which allows users to tailor the audio output with precision. This feature enables various EQ settings and dynamic range adjustments that enhance sound clarity and compensate for room acoustics, making it an essential tool for audio engineers and sound designers.

Further enhancing its capabilities, the Crown Studio Amplifier is designed with a sophisticated thermal management system that ensures optimal performance even during prolonged usage. Users can rely on its ability to maintain consistent output without overheating, which is crucial during demanding sessions, whether in the studio or at a live event.

Moreover, the Crown Studio Amplifier boasts a user-friendly interface, featuring intuitive controls that simplify operation. The LCD display provides vital information at a glance, allowing users to monitor levels, settings, and system status easily. This focus on usability enhances the overall experience, allowing professionals to concentrate on their craft rather than getting bogged down in technical complexities.

In addition to outstanding performance, the Crown Studio Amplifier is built for durability and longevity. The rugged chassis and high-quality components are designed to withstand the rigors of the road, making it a reliable choice for touring musicians and sound technicians alike.

With its impressive combination of power, advanced technology, and user-friendly features, the Crown Studio Amplifier continues to set a high standard in the audio industry, making it an ideal choice for anyone serious about sound quality. Whether for studio work, live performances, or home audio setups, the Crown Studio Amplifier delivers exceptional fidelity and reliability, upholding Crown's legacy of excellence in professional audio.
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