High Definition 5-channel Audio-Video Amplifier HT750 O W N E R ’ S M A N U A L
PREFACE Marsh Sound Design O Congratulations! n your acquisition of your new HT750 is a high definition Audio/Video amplifier. As such, this product represents a unique synthesis of form, function and fidelity, superbly crafted to deliver all the critical requirements of a truly high performance home theater. You will find only the finest audiophile-grade electronic components used in the signal path.
UNPACKING Marsh Sound Design 1 2 2 Your new product was diligently handcrafted, thoroughly tested and carefully packed at our factory. In the unlikely event that this product is damaged during shipment, be sure to save the carton as evidence for the freight carrier's inspection and call your local dealer immediately. We strongly recommend that you always save the box and packing materials should you have to transport your product for any reason.
WARRANTY Marsh Sound Design 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.
TABLE OF CONTENTS Marsh Sound Design 6 PREFACE 3 UNPACKING 4 CONTENTS 4 WARRANTY 5 YOUR RECORDS 5 RECOMMENDATIONS 7 FRONT PANEL CONTROLS 8 REAR PANEL CONNECTIONS 9 INTERNAL PROTECTIONS 10 GENERAL PRECAUTIONS 11 REPLACE THE AC POWER FUSE 12 TROUBLE SHOOTING GUIDE 13 SPECIFICATIONS 14
RECOMMENDATIONS Marsh Sound Design Placement Recommendation Do not install the unit inthe 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. Listening Recommendation Please note that your new HT750 will improve sonically over the course of the first week.
FRONT PANEL CONTROLS Marsh Sound Design Front Panel Controls Marsh 3 2 1 DIMMER POWER High Definition 5-Channel Audio-Video Amplifier MSD-HT750 Figure 1. HT750 Front Panel Controls. 1. POWER Pressing the POWER button once to turn the unit ON. Press the POWER button again to turn the unit OFF. 2. DIMMER Press this button to adjust the brightness of the channel indicators on the front panel display. The brightness can be adjust into five different levels for variety of room condition. 3.
REAR PANEL CONNECTIONS Marsh Sound Design Rear Panel Connections CHANNEL 5 UNBALANCED INPUT 3 CHANNEL 4 UNBALANCED INPUT PUSH 1 CHANNEL 3 UNBALANCED INPUT PUSH CHANNEL 2 UNBALANCED INPUT PUSH CHANNEL 1 UNBALANCED INPUT PUSH Marsh PUSH 5 6 IN OUT I2 VDC REMOTE TRIGGER MARSH SOUND DESIGN S FU E CHANNEL 5 BALANCED INPUT CHANNEL 4 BALANCED INPUT CHANNEL 3 BALANCED INPUT CHANNEL 2 BALANCED INPUT CHANNEL 1 BALANCED INPUT 2 High Definition Five Channel Audio-Video Power Amplifier CHANN
INTERNAL PROTECTIONS Marsh Sound Design Internal protections 1. Over-current protection The MSD-HT750 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-HT750 will go into protect mode when it detects DC voltage at the speaker output.
GENERAL PRECAUTIONS Marsh Sound Design 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.
REPLACE THE AC POWER FUSE Marsh Sound Design Replacing the AC Power Fuse 1. 2. 3. 4. Turn the unit off. Disconnect the AC power cord. Slide open the fuse drawer completely. Remove and replace the fuse in the rear compartment. Use fuse type 6.35 x 3.18 mm 8 Amp. Slow blow 5. Close fuse drawer completely. 6. Reconnect the AC power cord.
TROUBLE SHOOTING BASICS Marsh Sound Design Trouble Shooting the Basics Problems Unit does not turn on. The CHANNEL INDICATORS are not lit. Solutions Confirm that the power cord is plugged in properly. Check If the fuse is still good. No sound. Check the speaker cable connection. Check the interconnect cable connection. Check the setting of the input selector switches at the rear panel. They must be set according to the type of input (Balanced or Unbalanced) being used. No sound from one speaker.
SPECIFICATIONS Marsh Sound Design MSD-HT750 Specifications Power Output (All channel driven) 150 W(Rms) @8 ohms 20 Hz-20 kHz 250 W(Rms) @4 ohms 20 Hz-20 kHz Power Output - Peak (Burst 1 cycle sine, interval = 10) 205 W @5 ohms 385 W @4 ohms Total Harmonic Distortion (THD)+Noise < 0.02% @20 Hz-20 kHz at 150W, 8 ohms < 0.04% @20 Hz-20 kHz at 250W, 4 ohms Frequency response 20 Hz-20 kHz @0.
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