Basic Troubleshooting

A summary of fault conditions and their causes and remedies are listed below.

The Model 12 Mono Power Amplifier can produce high power levels that, without well-designed protection circuitry, could damage loudspeakers. Therefore, most fault conditions will result in the Model 12 reverting into Standby Mode.

Condition:

Cause:

Remedy:

Front panel POWER INDICATOR LED does not illuminate after pressing POWER/STANDBY BUTTON, amplifier does not operate normally:

Incorrect power connections, incorrect speaker connections, or circuit breaker must be reset.

Abnormal Operation of the Model 12 internal circuitry.

Reset circuit breaker, review Installation and Rear Panel Connections section of Owner’s Manual.

Contact your dealer immediately.

FRONT PANEL STANDBY/POWER button reverts to Standby Mode during listening but can be returned to normal operation:

Excessive sub-sonic or DC signals produced by source components.

Repair or replace source component. Identify and correct abnormal conditions such as low frequency rumble and/or acoustic feedback caused by phono playback (if applicable).

Severe clipping of amplifier circuitry.

Reduce volume slightly or use higher efficiency loudspeakers.

AC MAINS CIRCUIT BREAKER switches OFF or will not AC mains voltage too high for amplifier. remain ON:

Consult your dealer immediately to have the amplifier reconfigured for the proper AC mains voltage.

	Abnormal operation of amplifier internal circuitry.	Contact your dealer immediately.
50/60 Hz buzz noise in loudspeakers:	Ground loop condition created between	Use balanced system configuration if possible.
	components in system.
		Inspect interconnect cables for poor connection or
		termination.

12 specifications

Jeff Rowland Design Group, renowned for its high-end audio equipment, continually pushes the boundaries of audio performance and engineering innovation. Among their flagship offerings is the Model 12, a powerful integrated amplifier that embodies the company’s commitment to excellence in sound reproduction.

The Model 12 features a sleek, minimalist design, showcasing Jeff Rowland's dedication to both aesthetics and functionality. Its elegant chassis is crafted from high-quality materials, ensuring durability while maintaining a refined look that seamlessly fits into any sophisticated audio setup. The attention to detail extends beyond the exterior, as the internal components are selected for their performance and reliability.

At the heart of the Model 12 lies advanced Class D amplification technology, which enables it to deliver high power output with remarkable efficiency. This innovative design minimizes heat generation while maximizing audio clarity, making it suitable for a variety of speaker setups. With an output of 150 watts per channel into 8 ohms, it can effortlessly drive demanding loudspeakers without sacrificing sonic integrity.

One of the standout features of the Model 12 is its outstanding dynamic range, allowing it to reproduce music with striking realism and emotional depth. This amplifier ensures that even the most subtle nuances in recordings are captured, providing an immersive listening experience for audiophiles and music enthusiasts alike. The incorporation of a sophisticated power supply further enhances audio performance, stabilizing and optimizing power delivery to the amplifier’s output stage.

The Model 12 also offers a range of connectivity options, accommodating both modern digital inputs and traditional analog sources. This versatility makes it an ideal choice for users looking to integrate various media players, streamers, and even home theater systems. Its user-friendly interface and remote control capability allow for convenient operation, ensuring ease of use without compromising on performance.

In summary, the Jeff Rowland Design Group Model 12 is a testament to the company’s philosophy of creating high-performance audio solutions. With its elegant design, advanced Class D technology, and remarkable sonic capabilities, it stands as a premier choice for those seeking to elevate their audio experience to new heights. Whether for casual listening or critical evaluation, the Model 12 delivers audio fidelity that resonates with clarity and power.