Amplifier Maintenance, Cleaning, and Protection

Maintenance and Cleaning

All Jeff Rowland Design Group products are designed to provide a lifetime of enjoyment and listening pleasure. The chassis is sealed to prevent dust from entering and the interior of the chassis should not need cleaning during the lifetime of the product. All internal circuitr y is self-adjusting such that no adjustments or maintenance of any kind are necessary over the lifetime of the product. If the amplifier is ever in need of service, updating, or upgrading, it should only be returned to an authorized repair facility or technician for servicing.

The Model 302 Stereo Power Amplifier is uniquely constructed from a number of precision machined aluminum subassemblies. The front panel of the unit is machined in a unique process that incorporates a diamond tipped cutting tool. This process was refined over many years to produce an artistic and attractive finish.

Because the surface is not finished in the typical fashion of most audio and video equipment, there are a few rules that must be kept in mind when cleaning the equipment.

!Please allow the front panel to cure for 6 months before attempting to clean it. This will prevent small scratches from marring the surface before the surface coating has had a chance to harden completely.

!The top cover, sides, and bottom cover can all be cleaned with a soft cotton cloth (such as an optical lens cleaning cloth or fine furniture polishing rag) dampened with plain water. Water should be applied directly to the cloth and not the chassis. If a mark has been left on the chassis, do not use any type of abrasive or chemical cleaner to remove the mark. A ver y mild plastic or glass cleaner that does not contain ammonia should be tried only as a last resort.

!Please contact the factory before trying any type of cleanser on the chassis other than water to clean the unit.

!The front panel of the unit should never be cleaned with anything other than a very soft cotton cloth and plain water or fine oil-based furniture polish. Because of the fine finish of the front panel, small scratches from the use of any other agent to clean the front panel will become very visible.

If you have any questions about the care or cleaning of your Model 302 amplifier, please contact your dealer or the Jeff Rowland Design Group factory before attempting to clean the chassis. The use of a cleanser or abrasive to clean the chassis that has not been approved by the factory will almost certainly damage the finish and will not be covered under warranty.

Protection Systems

The Model 302 Stereo Power Amplifier is equipped with active circuitry and thermal circuit breakers for protection against excessive AC mains voltage. However, since no protection circuitry or system can completely protect a product from every electrical hazard, certain precautions should be observed. In the event of severe voltage hazards such as lightning or when the amplifier will not be used for extended periods of time, the amplifier should be unplugged from the AC mains to avoid potential damage to the internal circuitry. All other audio/video system components should also be disconnected from AC mains power as hazardous voltages can travel throughout an interconnected system.

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Jeff Rowland Design Group 302 owner manual Maintenance and Cleaning
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302 specifications

Jeff Rowland Design Group (JRDG) is renowned for its commitment to high-end audio equipment, and the Model 302 amplifier is a testament to that legacy. This amplifier exemplifies not only sonic performance but also the innovative technologies that JRDG employs in its designs.

The Model 302 is a stereo amplifier that delivers outstanding audio fidelity, rated at 150 watts per channel into 8 ohms, with a remarkable 300 watts into 4 ohms. It is crafted to drive a wide range of speakers, making it extremely versatile, and ensuring that it can perform optimally in various audio setups. The amplifier presents an unmatched dynamic capability, allowing it to reproduce both the most delicate notes and the most powerful crescendos with equal clarity and precision.

One of the standout features of the Model 302 is its use of power supply regulation. JRDG employs a proprietary technology known as "Dynamic Power Management," which continuously adjusts the power supply in response to the demands of the audio signal. This dynamic approach helps maintain low distortion and high efficiency, resulting in a clean and accurate sound reproduction. The design minimizes noise and interference, ensuring an immersive listening experience.

Additionally, the Model 302 showcases an elegant design, featuring a minimalist aesthetic that is characteristic of Jeff Rowland's philosophy. Its understated yet sophisticated look is complemented by a chassis that effectively dampens vibrations, further enhancing audio performance. The construction itself uses high-quality materials, ensuring durability and longevity, appealing to both audiophiles and casual listeners alike.

The amplifier also incorporates advanced thermal management technology, designed to keep the unit cool even during extended periods of intense use. This is essential for maintaining consistent performance and avoiding overheating, which can negatively affect sound quality.

Overall, the Jeff Rowland Design Group Model 302 epitomizes high-end audio engineering. With its powerful performance, innovative features, and timeless aesthetics, it appeals to discerning listeners who seek not just a component, but a significant part of their audio journey. The Model 302 is a celebration of what can be achieved when technology and art converge in pursuit of perfect sound.
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