Basic Operation

Lexicon

COOLING SYSTEM

The LX Power Amplifiers use temperature-controlled fans to exhaust heat. Heatsink temperatures are measured hundreds of times each second. Under most conditions, the fans are set to a slow speed. When the temperature climbs above 85˚C, the fans are set to a medium speed. When the temperature climbs above 100˚C, the fans are set to a high speed.

PROTECTION MODES

The LX amplifiers are equipped to protect against overheating and miswiring, as well as electrical failures such as short circuits, device failures, internal faults, and DC output to the speakers. A combination of dedicated circuitry and microprocessor control ensures that the amplifier will perform safely and reliably under extreme conditions.

THERMAL PROTECTION

JTS (Junction Temperature Simulation) provides an advanced level of thermal protection that allows the LX amplifiers to achieve maximum performance with a minimum number of output transistors. This design requires a smaller quantity of high-quality output transistors, enhancing performance and reliability.

JTS predicts the internal temperatures of output transistors to prevent them from overheating. To arrive at an accurate internal temperature prediction, JTS measures the output voltage and current each output transistor delivers and combines this informa- tion with heatsink temperatures. When an output transistor reaches its maximum allowable temperature, it is instantly restrict- ed until the temperature decreases.

JTS’s dynamic nature enables it to avoid the problems inherent in competing products that rely only on heatsink temperatures. Heatsink temperatures do not always correlate to the temperatures inside the output transistors. JTS is calibrated by device parameters, which allow it to predict overheating even if the heatsinks are relatively cool.

When JTS activates, a distorted signal will be present in the corresponding channel. Check the airflow around the amplifier and take the following measures:

•Provide additional cooling.

•Make sure speakers have adequate impedance ratings (see page 2-5).

•Reduce system volume level.

In addition to the protection provided by JTS, the amplifier includes thermal protection for each channel and the main power transformer. If a heatsink temperature exceeds 115˚C, the channel will deactivate and the corresponding channel status LED will flash red. When the heatsink cools below 115˚C, the channel will automatically reactivate and the corresponding channel status LED will light blue.

If the main power transformer temperature exceeds 110˚C, the transformer will deactivate, all channel status LEDs will no longer be lit, and the standby LED will flash rapidly. The internal fans will automatically be set to full speed to cool the transformer. Once the transformer has cooled enough, it will automatically be reset and the amplifier will operate normally. The channel status LEDs will light blue, and the standby LED will no longer be lit.

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Lexicon 070-14876 manual Cooling System, Protection Modes, Thermal Protection
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070-14876 specifications

Lexicon 070-14876 is an innovative audio processor designed for both professional and consumer audio applications. This device is renowned for its high-quality sound processing capabilities, making it a favorite among musicians, sound engineers, and audiophiles. Packed with advanced technologies, the Lexicon 070-14876 enhances audio performance while providing an intuitive user experience.

One of the standout features of the Lexicon 070-14876 is its superior reverb and effects processing. With Lexicon's renowned algorithm, users can access a wide range of reverb types, from lush halls to tight rooms, allowing for creative flexibility. This versatility enables artists to shape their audio spaces and enrich their soundscapes, making it an essential tool in both studio and live settings.

The device also includes multiple I/O options, catering to various connectivity needs. With balanced XLR inputs and outputs, along with digital connections such as AES/EBU, S/PDIF, and ADAT, the Lexicon 070-14876 is capable of integrating seamlessly into any audio setup. This broad compatibility ensures that it can be utilized with other studio equipment, digital audio workstations, and live sound systems without any issues.

Another significant characteristic of the Lexicon 070-14876 is its user-friendly interface. The built-in LCD display and clearly labeled knobs provide an intuitive way to navigate through the device's extensive features. Users can easily tweak parameters and store presets, streamlining the creative process without the need for complicated menus or lengthy setups.

In addition to its robust processing capabilities, the Lexicon 070-14876 is built with durability in mind. Its rugged chassis ensures that it can withstand the rigors of touring and live performances while maintaining consistent performance. This reliability makes it a preferred choice for professionals who rely on their equipment to deliver top-notch sound in high-pressure environments.

Finally, the Lexicon 070-14876 is capable of real-time audio processing, which is crucial for live performances where delay or latency can hinder the experience. By providing instant feedback and adjustments, it allows performers to deliver their best while ensuring an immersive experience for the audience.

In summary, the Lexicon 070-14876 stands out in the realm of audio processing with its exceptional sound quality, versatile connectivity, user-friendly interface, rugged construction, and real-time performance capabilities. Whether in the studio or on stage, this device elevates audio production and is an invaluable asset for anyone serious about sound.
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