Trigger does not 1. Measure trigger voltage with a voltmeter. It
workneeds to be
Speaker pops | 1. Speaker may need resistor placed across terminal. |
when MA252 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 MA252 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:
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| Line level inputs /outputs | Gold RCA jacks |
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| Input impedance | 50k ohms |
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| Speaker inputs /outputs | detachable plug |
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| Output power | 50 watts RMS per channel (8 ohms) |
| Peak output power | 100 watts per channel (8 ohms) |
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| 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 |
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| IMD distortion | less than 0.01% 60 Hz 7 kHz 4:1 (SMPTE) |
| Trigger control | 12 VDC 35mA on 3.5mm mono jack |
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| Dimensions | 17" x 3.5" x 11.75" (431.8 x 89 x 298mm) |
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| Video trigger | 0.5 v |
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| Power | 175 watts at 117 VAC or 230 VAC |
| Weight | 11 lbs (5 kg) |
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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
MA252
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 MA252 is used to power stereo speakers, usually in a single room. Each channel has a gain control. The MA252 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 MA252 is that whole house music from another amplifier can be heard on the speakers connected to the MA252. When the local source needs amplifier power the MA252 senses this, disconnects the other amplifier and amplifies the local source. The MA252 amplifier is designed to meet the amplifier needs of custom installed systems where
Key Features:
Manual and Automatic Power On and Off. The MA252 stereo power amplifier is designed to be turned on when a video signal is detected, music inputs are sensed, a
Whole house music override. In homes, yachts, businesses and motor home applications (typically with plasma or large screen TV's) the MA252 features amplifier inputs so that whole house music system can be heard on the local speakers (without the MA252 turned on). When the local source (TV, dish, etc.) needs amp power, the whole house music switches off automatically and the MA252 amplifier plays the local source. Automatic protection circuitry. Each MA252 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 MA252 so installers normally set the gain.
