M O A P SO H S R E R A T I U N N G D S E D M A N G I N Power amplifier U A L A400S
Warning The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to people. RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: To prevent the risk of electric shock, do not remove the cover (or back) . No user-serviceable parts inside. Refer servicing to qualified service personnel.
Important/Precautions Before proceeding with the installation, please read the instructions carefully and completely. If you have any problems, do not hesitate to contact your retailer or our Service Department. 1. All warnings on the unit and in the operating manual should be followed. 2. Operate the unit only from a power source of the appropriate voltage indicated on the rear panel. 3. Do not use a damaged or deformed power cord as it may cause electric shock.
Thank You for purchasing the MARSH SOUND DESIGN MSD-A400S. MSD brings you extraordinary components that are true, above all, to the art of music.
Table of Contents Important/Precautions..............................................................................................2 Preface.....................................................................................................................6 Unpacking............................................................................................................8 Placement Considerations.........................................................................................9 Functions.......
M SD's logo comes from an ancient Native American petroglyph pecked in stone, high in the Sierra Nevada mountain range. Long ago, small, selfsufficient groups of people moved about the mountains, hunting and gathering, and celebrating rituals. Leaving behind little about themselves, except for these rock figures and a few stone tools. The mark we found, created a thousand years ago, could have been a sun sign, a map, or a symbol of focus and concentration-or yet some mystery we cannot imagine today.
Preface J ust as a great performer spends years learning his or her instruments, so a master designer spends years understanding the complexities of audio circuitry and the science of electronics. For more than 30 years, Richard N. Marsh, author, lecturer, engineer, and inventor, has shared the art of perfecting audio circuits with other designers. Now, his goal is to bring you his accumulated experience in the service of music.
Unpacking 1 2 2 WARNING: PEOPLE WITH BACK PROBLEMS SHOULD NOT UNPACK THIS EQUIPMENT WITHOUT ASSISTANCE. 1. Carefully lift the unit out of the box. 2. Remove the foam packing material. 3. Set up the unit for use. REMEMBER: Keep all the original packing in case it is necessary to return the unit for servicing.
Placement Considerations DO NOT INSTALL THE UNIT IN THE FOLLOWING LOCATION: 1. In a place subject to direct sunlight. 2. In a humid place. 3. In an extremely hot or cold place. 4. In a place subject to vibrations. 5. In a dusty place. 6. In a poorly ventilated place.
Functions 2 Marsh 1 H IGH R ESOLUTION P USH- P ULL S OLID- S TATE A MPLIFIER Marsh Sound Design MSD- A400 S 1. POWER Pressing the POWER button once to turn the unit ON. Press the POWER button again to turn the unit OFF. 2. LED indicator The LED on the front panel will appear BLUE when the unit is ON. The LED will not be lit when the unit is switched OFF. In case of a malfunction, the unit will go into protect mode. The LED will be off. See more detail in the internal Protections section.
Connections 2 7 1 2 1 7 INPUTS BI-WIRED PUSH SPEAKERS LEFT RIGHT PUSH BI-WIRED SPEAKERS A A UNBALANCED 7 UNBALANCED BALANCED BALANCED LEFT RIGHT 3 B 6 Marsh MODEL: MSD-A400S POWER AMPLIFIER REMOTE IN 12A SLO-BLO 4 S FU E 3 7 B CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS : RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR WARNING TO PREVENT FIRE AND SHOCK HAZARD, DO NOT EXPOSE THIS DEVICE TO RAIN OR MOISTURE.
Internal Protections 1. OVER-CURRENT PROTECTION The MSD-A400S will go into protect mode and cut off the main power supply to protect the amplifier and speakers. This usually happens when the speaker terminals or wires are accidentally shorted together. 2. DC-FAULT PROTECTION The MSD-A400S will go into protect mode when it detects DC voltage at the speaker output.
Troubleshooting Guide If the unit does not function properly, please check the list below and follow the instructions. If the problem still occurs, please contact our service department. PROBLEM 1. Unit does not turn on. The LED is not lit. SOLUTION Confirm that the power cord is plugged in properly. Check If the fuse is still good. 2. No sound. Check the speaker cable connection. Check the interconnect cable connection. Check the setting of the input selector switches at the rear panel.
Care & Maintenance Use a soft, dry cloth to remove dust from the cabinet. For stubborn dirt, soak the cloth in a weak detergent solution. Be sure to wring the cloth well before wiping the unit. Use a dry cloth to wipe it dry. Do not use any volatile agents such as benzine or thinner. They may damage the surface of the cabinet. CAUTION: DISCONNECT YOUR ENTIRE SYSTEM FROM THE AC MAINS BEFORE CLEANING. NEVER APPLY LIQUID CLEANSERS DIRECTLY TO THE UNIT.
Warranty information 1. A MARSH SOUND DESIGN warranty only applies to the original retail purchaser. The warranty certifies that the product is free from defects in material and workmanship and authorizes free service and/or parts exchange for a period of TWO years from the date of purchase. Service must only be done at an authorized MARSH SOUND DESIGN Service center. 2. The warranty is subjected to the following conditions and limitations.
Specifications Maximum Power Output per Channel 200 W both channels driven continuously into 8 ohms load at 1 kHz 330 W both channels driven continuously into 4 ohms load at 1 kHz Frequency response, 20-20000 Hz +0/- 0.2 dB at 1 W to 200 W output into 8 Ohms loads -1 dB at 80 kHz THD+ Noise at maximum output <0.02% from 20 Hz to 20 kHz into 8 Ohms loads (<0.01% at 1 kHz.) Input Sensitivity for 200 W at 8 Ohms load 1.
Dimensions A400S Marsh 180.0 mm. 7 1/8” H IGH R ESOLUTION P USH- P ULL S OLID- S TATE A MPLIFIER Marsh Sound Design MSD- A400 S 482.0 mm. 19.0” 450.0 mm. 17 3/4” INPUTS BI-WIRED PUSH SPEAKERS RIGHT LEFT PUSH 160.0 mm. 6 3/8” BI-WIRED SPEAKERS A A UNBALANCED UNBALANCED BALANCED BALANCED LEFT RIGHT 12A SLO-BLO S FU E B Marsh 170.0 mm.
Notes Marsh 18
Notes Marsh 19
Marsh MARSH SOUND DESIGN Email: sales@marshsounddesign.com www.marshsounddesign.
