Knoll Systems service information, Problem Action

Precautions: The amplifier is a wideband design with substantial power output capability. Certain precautions must be taken to ensure proper operation:

1.Never expose the unit to moisture.

2.Never plug an input cable into the amplifier while the amplifier is turned on.

3.Never apply the “thumb test” (touching the “hot” lead of the input cable with your finger) to the tip of the input cable or input jack of the amplifier. RF rectification and/or hum will be created and could cause damage to the loudspeakers. Knoll will not be responsible for damage to the loudspeakers due to improper use of the equipment.

4.Under no circumstances should the output terminals of the amplifier be short-circuited.

5.Avoid restricting the airflow around the unit. Good airflow is necessary to help ensure proper operation.

6.Be sure that the loudspeakers connected can handle the output power of the amplifier at the loudspeakers rated impedance. The warranty on the amplifier does not cover damage to loudspeakers that have inadequate power handling capabilities.

7.Do not stack other system components or any other materials directly on top of the unit. The heat dissipating system of the amplifier depends on free-flowing air around the chassis.

SAFETY INSTRUCTIONS:

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.

Read all the safety and operating instructions before connecting or using this unit. All warnings on the unit and in this operating manual should be adhered to. All operating and use instructions should be followed.

WARNING: This product contains chemicals, including lead, known to the State of California to cause birth defects or other reproductive harm. Wash hands after handling.

Knoll Systems service information

The MA250 amplifier does not contain any user serviceable parts inside.

If a problem is encountered with the MA250, the most expedient procedure is to locate the problem and if possible repair it before requesting service. Be sure to carefully check other system components such as controllers, CD players, volume controls, wiring, speakers, etc. that may be at fault. If you suspect a problem that may require servicing, contact us at www.knollsystems.com/contact.html, or by phone at 800-566-5579 or 604-272-4555.

Problem		Action
Power LED does	1. Check that the MA250 is plugged in.
not light -	2.	Test the AC outlet with a lamp.
no sound	3.	If remote on/off is used, check that
		the trigger voltage is at 12 VDC.
	4.	Check MA250 power button on (in).
Sound cuts out	1. Verify speaker impedance is 4-16 ohms.
		Changing speakers may be required.
	2.	Check if the MA250 feels hot. If it's
		hot increase cooling - see Installation.
	3.	If music sense is selected on the rear, the

music level may be too low to activate and hold the amp on. Turn the source volume up and the MA250 gain controls down to compensate. Connect a 12 VDC trigger (trigger mode) or contact Knoll for information on defeating the music sense mode.

Distorted sound	1. Turn the volume down.
	2.	Check speakers for damage.
	3.	Check inputs for proper levels. MA250 gain
		and source output level may need adjusting.
	4.	Speakers may be less than 4 ohms.
MA250 does	1. In trigger mode, make sure trigger power is
not turn off		turning off by removing trigger plug on rear.
		Front panel power switch needs to be OUT.
	2.	In music sense mode, turn off source music

components. If the MA250 doesn’t turn off after about 2 minutes remove the RCA input plugs. If the MA250 turns off, reconnect the RCA plugs and turn down the sensitivity.

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MA250 specifications

The Knoll MA250 is a notable addition to the world of office seating, combining style, comfort, and functionality in an elegant design. This chair is particularly designed for those who spend long hours working at a desk, catering to the needs of professionals who require both support and aesthetic appeal in their workspace.

One of the standout features of the MA250 is its ergonomic design. The chair offers a contoured backrest that provides essential lumbar support, promoting healthy posture during long periods of sitting. This feature is crucial for reducing fatigue and discomfort associated with prolonged desk work. Additionally, the seat height is adjustable, allowing users to tailor the chair to their specific preferences, ensuring optimal comfort.

The MA250 is built with high-quality materials, enhancing both its durability and visual appeal. The upholstery options available vary from premium fabrics to leather, allowing users to choose a finish that best fits their office decor. This versatility means that the MA250 can seamlessly integrate into various office environments, whether modern or traditional.

Another significant feature of the MA250 is its advanced mechanisms. The chair is equipped with a synchro-tilt mechanism that allows the backrest and seat to move in harmony. This feature supports users in a variety of seated positions, enabling comfortable transitions between tasks and promoting movement throughout the day. This adaptability makes the MA250 suitable for collaborative spaces where dynamic work habits are common.

In terms of sustainability, Knoll emphasizes eco-friendly practices in the production of the MA250. The materials utilized are sourced responsibly, and the design prioritizes longevity, aiming to reduce waste over time. The chair can be easily disassembled for recycling, reflecting a commitment to environmental stewardship.

With its combination of elegance, ergonomic design, and sustainable practices, the Knoll MA250 stands out as a premier choice for modern workspaces. Its thoughtful features cater to the demands of today’s professionals, ensuring that comfort and design go hand in hand. Whether in a private office, conference room, or shared workspace, the MA250 provides the balance needed for productivity and well-being in the workplace.