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User's Manual
40 BIT ENHANCED
DPA 900/1500 STEREO POWER AMPLIFIER
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 DPA900/1500 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, the Neth
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TABLE OF CONTENTS 1. INTRODUCTION.....................................................................................................................................4 2. FEATURES.............................................................................................................................................4 3. CONTROL ELEMENTS..........................................................................................................................4 3.1 The Front Panel 3.2 The Rear Pa
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1. INTRODUCTION The LTO DPA900/1500 40 Bit DSP Stereo Amplifier is a high power, low profile, professional Power Amplifier with advanced features and great reliability. In fact, the amplifier functions far beyond a traditional power amplifier, it is also a versatile effect processor. You can set the input and output audio configuration through recalling one of the presets included in the internal memory or PC editor software. The amplifier delivers tremendous power in only two rack spaces, provi
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2 1 3 2 1 3 6. Level Control for Channels 1&2 These two controls are used to adjust output level of channel 1 and channel 2 respectively. 7. UP/DOWN Key This key is used to move inside the menus or to modify the parameter's value. 8. SELECT Key This key is used to select the menu that you wish to edit. 9. ENTER Key This key is used to edit or confirm the parameter's value. 10. Fan The fan can accelerate the flow of air to lower the temperature inside unit.The inside temperature deter- mines the
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18. RS485 IN The function of the RS485 IN is opposite to RS85 OUT. It allows incoming communication between a DPA900/ 1500 stereo amplifier and PC or another DPA900/1500 stereo amplifier. The RS485 port is very suitable for remote control over long distances (Difficult with RS232 standard ports) and daisy-chaining several DPA900/ 1500 stereo amplifiers. 19. RS485 OUT This is the standard serial communication interface. It allows outgoing communication between a DPA900/ 1500 stereo amplifier and
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- Hum Cancel (ON/OFF) Select "EDIT" using SELECT key. Then select "HUM CANCEL" using UP/DOWN keys, both the "HUM CANCEL" and "EDIT" indicators will light up. Press "ENTER" to set Hum Cancel function ON or OFF. Note: the HUM CANCEL indicator will be lighting all the time if you set this function ON, and it effects only on the selected channels. - Noise Gate (ON/OFF) Select "EDIT" using SELECT key. Then select "NOISE GATE" using UP/DOWN keys, both the "EDIT" and "NOISE GATE" indicators will light
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2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 5.2 Connection to the PC Connect the First DPA to the PC's RS232 serial port, using a 9-pin female plug connected to the RS232 socket on the rear panel of unit. Connect RS485 IN of the Second DPA to the First DPA 's RS485 OUT socket, in this way, you can connect up to 32 DPA units for a same PC. IMPORTANT!!! If the first unit is placed at a distance to the PC that exceeds 5 meters, RS232 to RS485 converters must be used to reach it. And the first unit connecte
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2>. The PC Editor should now load. A welcome screen will appear. This closes after 5 seconds (or click on it). Select NEW from the FILE menu. A window will open showing several different model names, because the same software is used for some of our pro audio models. Select DPA amp and click OK. You will then be presented with 2 options NEW UNIT and NETWORK SCAN. If your DPA unit has already been installed and set-up and you now wish to view and/or modify some param- eters, do the following: Sel
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5.5 Help File The HELP file accessible from within the PC Editor will be updated as necessary. Since software updates after the printing of this manual may affect the instructions provided here, please check the Help File for any later remarks. 5.6 Introduction to the PC Editor When you launch the editor on your PC, you will see the opening screen following (later software versions may differ). Each of the numbered sections is explained in this page - just look for the number icons within the te
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6. PARAMETER MENUS DESCRIPTION - HUM CANCEL: allows the modification of the dynamic NOTCH filter parameters. The graph included shows the filter response curve. - NOISE GATE: allows the modification of the noise gate parameters. The graph included shows the filter curve. - MULTICOMP: allows the modification of the multiband compressor parameters. The graphs below show the response curves of the two compressors. - DELAY: allows to apply a delay to each amplifier's channel, with the possibility to
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8. CONNECTIONS The following diagrams show the schemes of the recommended cables and some connection examples referred to various system configurations. Inputs A & B, RS485 IN 1 GROUND 3 BALANCED XLR-M 2 HOT (+) COLD ( ) Inputs A & B SLEEVE GROUND TIP BALANCED JACK RING HOT (+) COLD ( ) Parsllel Output Connectors, RS485 OUT 2 HOT (+) 3 BALANCED XLR-F 1 GROUND COLD ( ) RS232 RS232 (9-Pin) 12
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2 1 3 2 1 3 2 1 3 2 1 3 9. APPLICATION Total two optional modes: Please see following diagram for connecting the power amplifier into your audio system. 9.1 Stereo Mode In this mode, channel 1 and channel 2 operate independently (just as traditional input into channel 1 can be out- put from channel 1 only, similarly, the signal input into channel 2 can be output from channel 2 only. Input Input Connector Connector + Balanced Channel 1 GND 1 3 2 INPUT Apparaten skall anslutas POWER OUTPUTS till j
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2 1 3 2 1 3 2 1 3 2 1 3 You can also operate the paralleled mode via outside wiring, so the signal input from channel 1 or 2 will beo- tuput from both channel 1 and channel 2 simultaneously. The volume of channel 1 or channel 2 can be controlled separately. Input Input Connector Connector + Balanced Channel 1 GND 1 3 2 INPUT Apparaten skall anslutas POWER OUTPUTS till jordat uttag nar den TIP/PIN 2 ansluts till ett natverk RING/PIN 3 CH1 SLEEVE/PIN 1 1+ 1- POS NEG CH2 CH1 2+ 2- POS NEG MODE LIMI
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1 2 3 2 1 3 2 1 3 2 1 3 Input Input Connector Connector + Balanced Channel 1 GND 1 3 2 INPUT Apparaten skall anslutas POWER OUTPUTS till jordat uttag nar den TIP/PIN 2 CH1 ansluts till ett natverk RING/PIN 3 1+ 1- SLEEVE/PIN 1 POS NEG CH2 CH1 2+ 2- POS NEG MODE LIMITER BRIDGE RS485 IN STEREO OFF 1+ 2+ PARALLEL BRIDGE ON BREAKER CH1 POS NEG OUTPUT OUTPUT1 BRIDGE MONO TIP/PIN 2 CH2 RING/PIN 3 SLEEVE/PIN 1 1+ 1- RS485 OUT POS NEG CH2 MODEL SERIAL PARALLEL CH2 RS232 OUTPUT OUTPUT2 SERIAL PORT MODE R
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2 1 3 2 1 3 2 1 3 2 1 3 9.2 Bridge Mode In this mode, the signal input into channel 1 will be output from the bridged end, on the other hand, the output level control of channel 2 should be turn down to smallest (turn the volume control at counterclockwise). Only the volume control of channel 1 is used to control the volume of whole system. Input Input Connector Connector Balanced GND 1 3 2 INPUT Apparaten skall anslutas POWER OUTPUTS till jordat uttag nar den TIP/PIN 2 ansluts till ett natverk
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10. TECHNICAL SPECIFICATIONS MODEL DPA900/1500 40 Bit DSP Enhanced Stereo Amplifier 20Hz 20KHz@0.1% THD, Stereo Mode 8 ohms per channel(EIAJ) 190W / 320W 4 ohms per channel(EIAJ) 300W / 500W Bridge Mono Mode 8 ohms, 1KHz, 0.1%THD 600W / 1000W Distortion (SMPTE-IM) <0.05% Frequency Response 20Hz-20KHz 1dB, -2dB points: 20Hz-20KHz Damping Factor, 1 kHz and below >300 at 8ohms Signal to Noise,20Hz-20KHz 102dB Voltage Gain 40x (32dB) Input Sensitivity @ 4 ohms 1Vrms 10Vrms (+22dB) Input Clipping 10K
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11. 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 wil
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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 NF01981-1.0
