Alto A400.4 Dragonfly Owner's Manual
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Alto A400.4 Dragonfly Owner's Manual

Alto a400.4 dragonfly high efficiency digital amplifier
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R
LTO
OWNER'S MANUAL
A400.4 DRAGONFLY
HIGH EFFICIENCY DIGITAL AMPLIFIER
www.altoproaudio.com
Version 1.2 OCTOBER 2007
English

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Summary of Contents for Alto A400.4 Dragonfly

  • Page 1 OWNER'S MANUAL A400.4 DRAGONFLY HIGH EFFICIENCY DIGITAL AMPLIFIER www.altoproaudio.com Version 1.2 OCTOBER 2007 English...

  • Page 2: Important Safety Instruction

    IMPORTANT SAFETY INSTRUCTION CAUTION WARNING To reduce the risk of electric shock RISK OF ELECTRIC SHOCK and fire, do not expose this equipment DO NOT OPEN to moisture or rain. TO REDUCE THE RISK OF ELECTRIC SHOCK PLEASE DO NOT REMOVE THE COVER OR Dispose of this product should THE BACK PANEL OF THIS EQUIPMENT.

  • Page 3: In This Manual

    5. TECHNICAL SPECIFICATIONS............6. WARRANTY................... 1. INTRODUCTION Thank you for your purchasing of the LTO A400.4 Dragonfly digital stereo amplifier. It is just one of the many LTO products that a talented, multinational Team of Audio Engineers and Musicians have developed with their great passion for music.

  • Page 4: Multimedia Set Up

    HOOK RECORDING STUDIO SET UP A400.4 DRAGONFLY CLIP CLIP CLIP CLIP LIMIT LIMIT LIMIT LIMIT POWER ON CLIP CLIP CLIP CLIP LIMIT LIMIT LIMIT LIMIT POWER Also in this case, A400.4 is connected to the CTRL ROOM output of the mixer and drives four passive studio monitors such as the LTO MICRO4.
  • Page 5 HOOK SMALL GIG SET UP A500.2 DRAGONFLY CLIP CLIP POWER ON LIMIT LIMIT POWER In this case, a passive mixer with different sound sources connected such as microphone, keyboard and electric guitar send the main mix signal to the A400.4. You can connect two pairs of passive PA cabinets such as the LTO ELVIS 10 or ELVIS 12 for a gig in a small Pub/Bar or for a small Band rehearsal session.

  • Page 6: Control Elements

    3. CONTROL ELEMENTS Front Panel: 1 Power On LED This green LED will light up when you switch the A400.4 ON. 2 Power Switch To switch the A400.4 ON and OFF. 3 Level Control for Channels 1 , 2 , 3 & 4 Adjust the output signal level of the respective channel.

  • Page 7: Limiter Switch

    3. CONTROL ELEMENTS Rear Panel: 7 Input sockets These sockets accept the balanced signal from XLR and 1/4" connectors as well. These Inputs are compatible with low-impedance, unbalanced/balanced, line-level outputs emanating from such as mixers, synthesizers, drum machines, direct boxes, crossovers, etc. Electric guitars, microphones, and other low level/high-impedance output devices require a pre-amp or a D/I box.

  • Page 8: Operation

    A DEEPER LOOK: BALANCED OR UNBALANCED? When cables are very long (e.g., over 6 meters/20 feet), the cable itself can act as an "antenna" and pick up radio frequency noise, AC hum, or other types of noises. To avoid these problems, many recording studios and live sound installers use balanced lines.

  • Page 9: Power Consideration

    4.2 IMPEDANCE Your A400.4 will easily drive 4 Ohm loads in Stereo mode. However, the impedance of any loudspeaker changes with frequency, and its rated impedance is not always its minimum impedance. If you connect more than one loudspeaker to the A400.4, please check that the actual load impedance does not drop below the A400.4's rated output load that is 4 Ohm.

  • Page 10: Technical Specifications

    5. TECHNICAL SPECIFICATIONS A400.4 DRAGONFLY 20 Hz 20 kHz@ 0.1%THD, Stereo Mode 8 Ohms per channel (EIAJ) 34 Watt 4 Ohms per channel (EIAJ) 60 Watt 4 Ohms per channel (Dynamic Power) 120 Watt (PEAK POWER) Controls FRONT: POWER SWITCH, CH1 &...

  • Page 11: Warranty Registration Card

    6. WARRANTY 1. WARRANTY REGISTRATION CARD To obtain Warranty Service, the buyer should first fill out and return the enclosed Warranty Registration Card within 10 days of the Purchase Date. All the information presented in this Warranty Registration Card gives the manufacturer a better understanding of the sales status, so as to purport a more effective and efficient after-sales warranty service.
  • Page 12 NO. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan http://www.altoproaudio.com Tel: 886-4-22313737 email: alto@altoproaudio.com Fax: 886-4-22346757 All rights reserved to ALTO. All features and content might be changed without prior notice. Any photocopy, translation, or reproduction of part of this manual without written permission is forbidden. Copyright 2007 Seikaku Group NF02317-1.2...

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