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User's Manual
MAC
STEREO POWER AMPLIFIER
2.2/2.3/2.4
R
LTO
www.altoproaudio.com
Version 1.0 September 2004
English
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the recommended fuse type as indicated in this SAFETY RELATED SYMBOLS manual. Do not short-circuit the fuse holder. Before replacing the fuse, make sure that the product is CAUTION OFF and disconnected from the AC outlet. RISK OF ELECTRIC SHOCK DO NOT OPEN Protective Ground This symbol, wherever used, alerts you to the pre- Before turning the product ON, make sure that it is sence of un-insulated and dangerous voltages with- connected to Ground. This is to prevent the risk of in the product encl
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PREFACE Dear Customer: Thanks for choosing LTO MAC 2.2/2.3/2.4 Stereo Power Amplifier which is the result of our LTO AUDIO TEAM's endeavors. For LTO AUDIO TEAM music and audio are much more than a job, they are a passion and an obsession! We have been designing professional audio products for a long time in cooperation with many of the world's major brands. The LTO line represents unparalleled analogue and digital products made by musicians, for musicians. With our design centres in Italy, Nethe
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TABLE OF CONTENTS 1. INTRODUCTION.....................................................................................................................................4 2. FEATURE LIST.......................................................................................................................................4 3. CONTROL ELEMENTS..........................................................................................................................4 3.1 The Front Panel 3.2 The Rear Pane
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1. INTRODUCTION Thank you very much for expressing your confidence in LTO products by purchasing our MAC 2.2/2.3/2.4 Stereo Power Amplifier. With the MAC 2.2/2.3/2.4 you have acquired an extremely musical and flexible high power amplifier which is based on many years of experience and finding in amplifier technology and is used through the world in the renowned studios. The MAC 2.2/2.3/2.4 is used for professional output of stage stereo with excellent performance. Output power can be adjusted at
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2 1 3 2 1 3 Signal LED These signal indicators light up when the output is more than 100mV. 5 5. Level Control These level controls are used to adjust the output signal level, you'd better adjust them properly to avoid any distortion. 3.2 Rear Panel 11 6 7 INPUT CH-2 CONNECTION (+) SRT 2 1 3 LINE CH-1 CH-2 T(+) WARNING (GND) R(-) TO REDUCE THE RISK OF FIRE () - BREAKER OR ELECTRIC SHOCK, DO NOT S(GND) EXPOSE THIS APPARATUS TO RAIN OR MOISTURE. SEE INSTRUCTION BEFORE OFF ON USING! LF 30HZ FILTER
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In this mode, CHA input signal will be output from the bridge output connector, detail wiring diagram you can refer to chapter 5. 13. Fan 13 This fan release the heating from the unit by accelerating the air circulation (air flowing from front to back), and the speed is continuously variable. 4. INSTALLATION & CONNECTION 4.1 Mains Connection Do not insert the power cord into this unit until voltage has been correctly set. Do not plug the power cord into the mains until the voltage has been corre
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1 2 1 2 1 2 1 2 1 2 3 3 3 3 3 2 1 3 2 1 3 easily interface with most professional audio devices. Follow the configuration examples below for your particular connection. Balanced Tip Tip Ring Ring SLEEVE RING TIP TIP RING SLEEVE Sleeve Sleeve 1 1 2 2 3 3 Tip 1 Ring 2 TIP RING SLEEVE Sleeve 3 Unbalanced Tip 1 Ring 2 TIP RING SLEEVE Sleeve 3 Tip 1 2 Sleeve 3 TIP SLEEVE 1 Centre 2 3 Screen Tip Tip TIP SLEEVE SLEEVE TIP Sleeve Sleeve Tip Tip Ring Ring TIP RING SLEEVE SLEEVE RING TIP Sleeve Sleeve Tip
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2 1 3 2 1 3 2 1 3 2 1 3 Input wiring tips BALANCED UNBALANCED GND SHIELD 1 1 3 3 2 2 FROM FROM INPUT INPUT SOURCE SOURCE + + SHIELD SHIELD INPUT CH-2 CONNECTION (+) SRT 2 1 LINE 3 CH-1 CH-2 T(+) WARNING (GND) TO REDUCE THE RISK OF FIRE CHANNEL B () - R(-) BREAKER OR ELECTRIC SHOCK, DO NOT S(GND) EXPOSE THIS APPARATUS TO RAIN OR MOISTURE. SEE INSTRUCTION BEFORE OFF ON USING! LF 30HZ BRIDGED FILTER Apparaten skall anslutas till MONO jordat uttag nar den ansluts BALANCED 1.15V/20K till ett natverk
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2 1 3 2 1 3 2 1 3 2 1 3 Input wiring tips BALANCED UNBALANCED GND SHIELD 1 1 3 3 2 2 FROM FROM INPUT INPUT SOURCE SOURCE + + SHIELD SHIELD INPUT CH-2 CONNECTION (+) SRT 2 1 LINE 3 CH-1 CH-2 T(+) WARNING (GND) R(-) TO REDUCE THE RISK OF FIRE NO USING () - BREAKER S(GND) OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE. SEE INSTRUCTION BEFORE OFF ON USING! LF 30HZ BRIDGED FILTER Apparaten skall anslutas till MONO jordat uttag nar den ansluts BALANCED 1.15V/20K till ett natverk I
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6.2 Caution for Speaker Connection The output capacity of MAC 2.2/2.3/2.4 stereo power amplifier is very high, be sure to use a speaker system that has sufficient input capacity. If the input capacity of your speaker system is lower than the rated output of the MAC 2.2/ 2.3/2.4 stereo power amplifier, you can protect your speakers by connecting a fuse serially between the speaker and the amplifier as shown below. (+) Fuse + Speaker (-) - System Output ON CH1 CH2 POWER PROT CLIP SIG OFF POWER Use
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7.2 Block Diagram 11 CH-A CH-A E.R LA DIF PWR AMP 30Hz-9dB INPUT OUTPUT LINK MODE TURN-ON CIRCUIT SHOCK DC OFFSET +/- 1.15VRMS AUTORAMP DC SERVO +4dB SUB WOOFER OVER TEMP MONO 15Kohm (OPTION) SHORT CIRCUIT BRIDGED BALANCED PARALLEL CURRENT LIMITER TURN-ON/TURN-OFF TRANSIENTS CH-B CH-B E.B LA DIF PWR AMP 30Hz-9dB OUTPUT INPUT OPTION LINK CH-A BINDING POST ACTIVE TERMINALS POWER CLIP SWITCH CH-B AC POWER 120V/220V/230V /240V50/60Hz (OPTION) CH-A SIG AMP POWER TRANS NOTICE CH-B CH-A CIRCUIT BREAKER
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7. 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. Please fill out all the information carefully and genuinely, miswriting or absence of this card will
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SEKAKU ELECTRON INDUSTRY (H.K.) CO. LTD. No.1, Lane 17, Sec. 2, Han Shi West Road, Taichung, 401 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 c manual without written permission is forbidden. Copyright 2004 Sekaku Electron NF01893-1.0
