Hum and noise, Troubleshooting

Hum and noise

In most cases, one of the following suggestions should help you solve a hum noise in your system. Please try these steps in the order shown; proceeding from one step to the next if the prior suggestion does not eliminate the problem.

Potential ground loops in a complex A/V system

Suggestion #1

To determine if a cable TV connection is responsible for the hum, first turn off all the components. Disconnect the cable TV feed to your system at the first place where it connects to your components. Alternatively, disconnect the cable TV wire where it

Troubleshooting

Your Knoll amplifier is designed from trouble-free operation. If you follow the instructions in this manual, you should enjoy many years of high-quality listening enjoyment. However, as with any sophisticated device, there may be occasional problems upon initial installation, or during the life of the amp. The items on the list below are a brief guide to the minor problems that you may be able to correct yourself. If these solutions do not help, or if the problem persists, contact us for assistance.

ProblemSolutions

is connected at the wall outlet. Turn your system back on, and listen if the hum has disappeared. If removing the cable TV feed has eliminated the hum, you will need to insert a Ground Loop Isolator our model GB634) before reconnecting the cable TV feed, or contact your cable TV operator to see if they can better isolate your cable feed.

Suggestion #2

Turn off all components in your system, and then disconnect the input cables at the amplifier. Turn the amplifier back on to see if the hum is still present. If the hum disappears, the fault may be in the input cables used. Try replacing them with cables that have better shielding, and make certain that the input cables are not running on top of any AC power cords. Change the cables one at a time to determine if one or all cables are responsive. If the hum disappears when the input cables are disconnected, but returns after the cables are changed and the system reconnected, your source device may be causing the problem.

Amplifier won’t turn on

Amplifier won’t turn off

Amplifier turns on, but no audio from one or more channels

No audio from one or more channels

Audio levels differ from source device.

Master power switch turned off (No power light LED). Turn on Master Power Switch.

Remote trigger cable not properly connected. Verify connection of trigger cable at both ends.

Input plugs not connected to proper jack or are loose. Check input connections.

Speakers are not connected

properly. Check speaker connections at amp and speaker.

Improper settings or output levels Check the settings on your preamp, processor or controller. Also verify settings of the rear panel gain controls on your amp.

Audio plays and then cuts off Amplifier may be shorted. Check speaker connections for short-circuit at amp and speaker.

21K specifications

The Knoll 21K is a state-of-the-art ergonomic office chair designed to enhance workplace comfort and productivity. With its cutting-edge features and technologies, the 21K epitomizes modern seating solutions tailored for the dynamic office environment.

One of the standout characteristics of the Knoll 21K is its sophisticated lumbar support system. This feature has been engineered to promote healthy posture and reduce the risk of back strain during long working hours. Users can easily adjust the lumbar support to fit their individual needs, allowing for a customizable seating experience that caters to diverse body types.

The chair is built with advanced materials that not only provide durability but also contribute to its lightweight design. The breathable mesh backrest ensures optimal airflow, helping to keep the user cool and comfortable even in warmer conditions. In addition, the seat cushion is crafted from high-density foam that contours to the body, further enhancing comfort and support.

Another key feature of the Knoll 21K is its refined tilt mechanism. The chair offers a synchronized movement that allows the seat and backrest to tilt together at an optimal angle. This encourages dynamic movement and provides the user with the ability to shift positions effortlessly throughout the day. Additionally, users can easily lock the chair in an upright position or adjust the tension of the tilt to their preferences, enhancing the overall experience.

The armrests of the Knoll 21K are another highlight, featuring adjustable height and width settings. This flexibility ensures that users can find the most comfortable position for their arms, alleviating strain in the shoulders and neck. The chair also boasts a five-star base with smooth-rolling casters, enabling effortless mobility across various office surfaces.

To further enhance the chair's functionality, the Knoll 21K comes in a variety of colors and finishes, allowing businesses and individuals to personalize their workspace according to their aesthetic preferences. This customization not only elevates workplace design but also reflects the user's identity and style.

In summary, the Knoll 21K is a pinnacle of ergonomic design, featuring adjustable lumbar support, breathable materials, a synchronized tilt mechanism, and customizable armrests. Its combination of comfort, flexibility, and style makes it an ideal choice for anyone seeking to improve their sitting experience in the modern office. With its innovative technologies, the Knoll 21K is not just a chair; it's an investment in better health and productivity.