Warranty, Knoll Systems | Knoll MA250 instruction

Trigger does not 1. Measure trigger voltage with a voltmeter. It

workneeds to be 11-16 volts DC to work (current is about 35mA total per amp). See page 5 for details.

Speaker pops	1. Speaker may need resistor placed across terminal.
when MA250 is	Suggest 2000 ohm 1/4 watt. This discharges the
turned on or off	speaker internal capacitor if it has one.

Warranty

Knoll Systems warrants MA250 amplifiers sold in the USA and Canada by authorized Knoll dealers to be free of defects in materials and workmanship. This warranty extends for three full years from the date of purchase by the original consumer. Any products returned to Knoll Systems and found to be defective by Knoll Systems within the warranty period will be repaired or replaced at Knoll Systems decision, at no charge. Knoll Systems will not be responsible for the actual cost of installation or removal of the product, nor for any incidental or consequential damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you. This warranty gives you specific legal rights. You may have additional legal rights that vary from state to state.

Specifications:


	Line level inputs /outputs	Gold RCA jacks

	Input impedance	50k ohms

	Speaker inputs /outputs	detachable plug

	Output power	50 watts RMS per channel (8 ohms)
	Peak output power	100 watts per channel (8 ohms)

	Ideal impedance	4 - 8 ohms
	Frequency response	10 Hz - 40 kHz +/- 1dB (1w)
	S/N ratio	over 95 dB A weighted (50 watts)
	THD distortion	less than 0.1% 20 Hz to 20 kHz

	IMD distortion	less than 0.01% 60 Hz 7 kHz 4:1 (SMPTE)
	Trigger control	12 VDC 35mA on 3.5mm mono jack

	Dimensions	8.5" x 3.5" x 11.75" (216 x 89 x 298mm)
	Dimensions	8.5" x 3.5" x 11.75" (216 x 89 x 298mm)

	Video trigger	0.5 v p-p minimum

	Power	175 watts at 117 VAC or 230 VAC
	Weight	8 lbs (3.6 kg)

Note: Specifications subject to change without notice.

Knoll Systems

145 Tyee Drive Point Roberts, WA 98281

12140 Horseshoe Way, Richmond, BC V7A 4V4 Tel: (604) 272 4555, fax (604) 272 5595

Made in Canada

MA250

Stereo Amplifier

Installation Instructions v1.0

Warning: To be installed and/or used in accordance with appropriate electrical codes and regulations.

Description: Designed primarily for custom installations, the MA250 is used to power stereo speakers, usually in a single room. Each channel has a gain control. The MA250 can be turned on and off using the front panel power switch, composite video detection, when music is sensed or the 12 VDC trigger. A special feature of the MA250 is that whole house music from another amplifier can be heard on the speakers connected to the MA250. When the local source needs amplifier power the MA250 senses this, disconnects the other amplifier and amplifies the local source. The MA250 amplifier is designed to meet the amplifier needs of custom installed systems where high-quality sound is a specific requirement.

Key Features:

Manual and Automatic Power On and Off. The MA250 stereo power amplifier is designed to be turned on when a video signal is detected, music inputs are sensed, a 12-volt trigger is activated or the front panel power switch is pushed on. Power off is automatic in all modes except the front panel power button.

Whole house music override. In homes, yachts, businesses and motor home applications (typically with plasma or large screen TV's) the MA250 features amplifier inputs so that whole house music system can be heard on the local speakers (without the MA250 turned on). When the local source (TV, dish, etc.) needs amp power, the whole house music switches off automatically and the MA250 amplifier plays the local source. Automatic protection circuitry. Each MA250 channel is individually and fully protected against low impedance, overheating, overloading, overvoltage and undervoltage. The protection circuitry automatically restores the amplifier channel as soon as its parameter returns to the safe operating area. Individual input gain adjustment. Each channel features an input gain adjustment pot to adjust each channel for gain and speaker sensitivity variations. The gain adjustments are on the rear of the MA250 so installers normally set the gain.

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.