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Alto MAC 2.2, MAC 2.3, MAC 2.4 manual

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Table of contents for the manual

  • Page 1

    STEREO POWER AMPLIFIER MAC 2.2/2.3/2.4 User's Manual LTO R www .altoproaudio.com V ersion 1.0 September 2004 English[...]

  • Page 2

    1 SAFETY RELA TED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol, wherever used, alerts you to the pre- sence of un-insulated and dangerous voltages with- in the product enclosure. These are voltages that may be sufficient to constitute the risk of electric shock or death. Protective Ground T erminal AC mains (Alternating Current) H[...]

  • Page 3

    2 PREF ACE Dear Customer: For L TO AUDIO TEAM music and audio are much more than a job, they are a passion and an obsession! By purchasing our products you become the most important member of our AUDIO TEAM. W e would like LT O LT O to share with you our passion for what we design and we invite you to make suggestions, which will aid us in developi[...]

  • Page 4

    T ABLE OF CONTENTS 1. INTRODUCTION .....................................................................................................................................4 2. FEA TURE LIST .......................................................................................................................................4 3. CONTROL ELEMENTS ......[...]

  • Page 5

    1. INTRODUCTION 2. FEA TURE LIST Sophisticated protecting circuit protects the machine from improper tampering Excellent frequency echo and sound quality High fidelity and low noise Balanced XLR and 1/4" TRS input connectors Output connectors are speak-on jacks and binding post terminals Stereo mode, parallel mode and bridged mode are availabl[...]

  • Page 6

    6. Breaker This switch works as fuse for protecting the unit from damage. When the unit is overloaded or the temperature inside the unit is too high, this pushing-button will spring up and break the power supply . The power supply will be restored with pushing the switch down again. 7. AC Inlet This connector is meant for the connection of the supp[...]

  • Page 7

    a. Wiring Configuration Either the 1/4" TRS (T ip-Ring-Sleeve) phone jack or the XLR servo connector can be wired in balanced and unbal- anced modes, which will be determined by the actual application status, Please wire your systems as the following examples: 4. INST ALLA TION & CONNECTION 4.1 Mains Connection Do not insert the power cord[...]

  • Page 8

    5.OPERA TION easily interface with most professional audio devices. Follow the configuration examples below for your particular connection. The MAC provides three operating modes with each unit: s 2.2/2.3/2.4 tereo mode, parallel stereo power amplifie (mono) mode and bridged mode, you can decide each specific operating mode according to your actual[...]

  • Page 9

    5.2 Operate MAC in Parallel (Mono) Mode 2.2/2.3/2.4 In this mode, the channel A input signal will be output from the output connectors of both channels. The channel B input jack is not used, the channel A and B volumes can be adjusted independently . 8 P ARALLEL (MONO) STEREO CHANNEL A NO USING Channel B + Channel A + BRIDGED 1 2 3 GND INPUT FROM S[...]

  • Page 10

    5.3 Operate MAC in Bridged Mode 2.2/2.3/2.4 In this mode, the channel A input signal will be output from the bridge output connectors. In this case, use the channel A volume control to adjust the volume, keep the volume control of channel B turned completely down (counterclockwise). Bridged mode is intended for driving loads with a total impedance [...]

  • Page 11

    7. TECHNICAL SPECIFICA TIONS 7.1 Specifications ELECTRICAL SPECIFICATIONS INPUT SENSITIVITY INPUT IMPEDANCE FREQUENCY RESPONSE (at 10dB below rated output power) VOL TA GE GAIN DISTORTION(SMPTE-1M) S/N ratio Full short circuit, open circuit, thermal, ultrasonic, and RF protection stable into reactive or mismatched loads, turn ON/OFF , muting, tried[...]

  • Page 12

    7.2 Block Diagram INPUT LINK E.R 30Hz-9dB LA DIF PWR AMP OUTPUT CH-A CH-A 1.15V RMS +4dB 15Kohm BALANCED SUB WOOFER (OPTION) +/- MODE INPUT LINK E.B LA DIF PWR AMP OUTPUT CH-B CH-B AUTORAMP TURN-ON CIRCUIT SHOCK DC OFFSET DC SERVO OVER TEMP SHORT CIRCUIT CURRENT LIMITER TURN-ON/TURN-OFF TRANSIENTS BRIDGED P ARALLEL MONO ACTIVE CLIP CH-A CH-B AMP SI[...]

  • Page 13

    12 7. W ARRANTY 1. W ARRANTY REGISTRA TION CARD T o obtain Warranty Service, the buyer should first fill out and return the enclosed W arranty Registration Card within 10 days of the Purchase Date. All the information presented in this W arranty Registration Card gives the manufacturer a better understanding of the sales status, so as to purport a [...]

  • Page 14

    NF01893-1.0 SEKAKU ELECTRON INDUSTR Y (H.K.) CO. L TD. No.1, Lane 17, Sec. 2, Han Shi West Road, T aichung, 401 T AIW AN http://www .altoproaudio.com T el:886-4-22313737 email: alto@altoproaudio.com Fax:886-4-22346757 All rights reserved to AL TO. All features and content might be changed prior notice. Any photocopy , translation, or reproduction o[...]