Do not use this amplifier near water including near a bathtub, swimming pool or hot tub.

This unit should be installed so that its location does not interfere with proper ventilation. For example, don’t place the amplifier on a bed, sofa, rug, or similar surface that may block the ventilation openings; or place in a built-in installation such as a bookcase or cabinet that may block the flow of air through its ventilation openings.

The unit should be set away from heat sources such as radiators, heat vents, or other devices (including amplifiers) that produce heat.

The unit should be connected to a power supply outlet only of the voltage and frequency marked on its rear panel.

The power supply cord of the unit should be unplugged from the wall outlet when it is to be unused for a long period of time.

Care should be taken so that objects to not fall, and liquids are not spilled, into the enclosure through any openings.

The unit should be serviced by qualified service personnel when:

The power cord or plug has been damaged; or objects have fallen, or liquid has been spilled into the unit.

The unit has been exposed to rain, or liquids of any kind; or the unit does not appear to operate normally, or exhibits a marked change in performance.

The amplifier has been dropped, or the enclosure damaged.

To prevent electric shock, do not use the polarized plug with an extension cord, receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure.

Introduction: Thank you for your purchase of a Knoll 21K stereo power amplifier and congratulations on your choice. This amplifier is specifically designed to be the best sounding amplifier available anywhere. Our engineers and designers spent years of pain staking research and testing to perfect the sound quality. We hope you will appreciate this effort and enjoy the amp.

Unpacking: The carton and packing materials used in shipping your new amplifier were specially designed to protect it from the shock and vibration of shipping. We suggest that you save the carton and packing materials to use if you move, or if the unit ever needs to be shipped back to us for any reason. Should you discover that your amplifier has been damaged during shipping, please contact your dealer or Knoll immediately and request the name of the carrier so a written claim can be made.

The right to a claim against a public carrier can be forfeited if the carrier is not notified immediately in writing and if the shipping carton and packing materials are not available for inspection by the carrier. Save all packing materials until the claim is settled.

Placement

During normal home operation the amplifier will become warm. However, there are instances during high-level playback into low impedance speakers when the amplifier will become much warmer than normal. To ensure the amplifier’s trouble-free operation, it is necessary to provide adequate ventilation. Your amplifier should be kept away from external sources of heat such as radiators and hot- air ducts. The amplifier should never be placed with other heat-producing components in a cabinet or enclosure lacking free airflow. Do not stack other components on top of your amplifier.

Rack mounting

A rack mount version of the 21K is available. For best operation when rack mounting the 21k we suggest it be near the top of the rack and have vented blank 1 rack space panels above and below the 21k. For multiple 21k amps in one rack we suggest spacing the amps 1 rack space apart and inserting a vented blank 1-rack space panel between each amp.

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Knoll 21K installation instructions Placement, Rack mounting

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.