Nilfisk DPA900-1500 User Manual

User's Manual

40 BIT ENHANCED

DPA 900/1500

STEREO POWER AMPLIFIER

LTO

www.altoproaudio.com

Version 1.0 September 2004

English

SAFETY RELATED SYMBOLS

CAUTION

RISK OFELECTRIC SHOCK

DO NOTOPEN

This symbol, wherever used, alerts you to the presence of un-insulated and dangerous voltages within the product enclosure. These are voltages that may be sufficient to constitute the risk of electric shock or death.

This symbol, wherever used, alerts you to important operating and maintenance instructions. Please read.

Protective Ground Terminal AC mains (Alternating Current) Hazardous Live Terminal

ON: Denotes the product is turned on. OFF: Denotes the product is turned off.

WARNING

Describes precautions that should be observed to prevent the possibility of death or injury to the user.

the recommended fuse type as indicated in this manual. Do not short-circuit the fuse holder. Before replacing the fuse, make sure that the product is OFF and disconnected from the AC outlet.

Protective Ground

Before turning the product ON, make sure that it is connected to Ground. This is to prevent the risk of electric shock.

Never cut internal or external Ground wires. Likewise, never remove Ground wiring from the Protective Ground Terminal.

Operating Conditions

Always install in accordance with the manufacturer's instructions.

To avoid the risk of electric shock and damage, do not subject this product to any liquid/rain or moisture. Do not use this product when in close proximity to water.

Do not install this product near any direct heat source. Do not block areas of ventilation. Failure to do so

could result in fire. Keep product away from naked flames.

CAUTION

Describes precautions that should be observed to prevent damage to the product.

WARNING

Power Supply

Ensure that the mains source voltage (AC outlet) matches the voltage rating of the product. Failure to do so could result in damage to the product and possibly the user.

Unplug the product before electrical storms occur and when unused for long periods of time to reduce the risk of electric shock or fire.

External Connection

Always use proper ready-made insulated mains cabling (power cord). Failure to do so could result in shock/death or fire. If in doubt, seek advice from a registered electrician.

Do Not Remove Any Covers

Within the product are areas where high voltages may present. To reduce the risk of electric shock do not remove any covers unless the AC mains power cord is removed.

Covers should be removed by qualified service personnel only.

No user serviceable parts inside.

Fuse

To prevent fire and damage to the product, use only

IMPORTANT SAFETY INSTRUCTIONS

Read these instructions Follow all instructions Keep these instructions. Do not discard. Heed all warnings. Only use attachments/accessories specified by the

manufacturer.

Power Cord and Plug

Do not tamper with the power cord or plug. These are designed for your safety.

Do not remove Ground connections! If the plug does not fit your AC outlet seek advice from

a qualified electrician. Protect the power cord and plug from any physical

stress to avoid risk of electric shock. Do not place heavy objects on the power cord. This

could cause electric shock or fire.

Cleaning

When required, either blow off dust from the product or use a dry cloth.

Do not use any solvents such as Benzol or Alcohol. For safety, keep product clean and free from dust.

Servicing

Refer all servicing to qualified service personnel only . Do not perform any servicing other than those instruc-

tions contained within the User's Manual.

PREFACE

Dear Customer:

Thanks for choosing LTO DPA900/1500 Stereo Power Amplifier which is the result of our LTO AUDIO TEAM's

endeavors.

For LTOAUDIO TEAM,

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 Netherlands, and the United Kingdom we provide you with world-class designs, while our software development teams continue to develop an impressive range of audio specific algorithms.

By purchasing our LTO products you become the most important member of our LTO AUDIO TEAM. We would like to share with you our passion for what we design and we invite you to make suggestions, which will aid us in developing future products for you. We guarantee you our commitment to quality, continual research and development, and of course the best performance/price ratio.

Our LTO DPA900/1500 Stereo Power Amplifier is the result of many hours of listening and tests involving

common people, area experts, musicians and technicians. The result of this effort is the sophisticated circuit design featuring high power and superb quality together with superior reliability and stability to provide the highest possible audio performance.

music and audio are much more than a job, they are a passion and an obsession!

We would like to thank all the people that worked with us to make a vision real! Our designers and LTO staff

made the DPA900/1500 Stereo Power Amplifier, a very reliable and high quality product ready for all your

venues. And thanks to their passion for music and professional audio it has been possible for us to offer you, our most important team member, our continued support too.

Thank you very much.

LTOAUDIO TEAM

TABLE OF CONTENTS

1. INTRODUCTION.....................................................................................................................................4

2. FEATURES.............................................................................................................................................4

3. CONTROL ELEMENTS..........................................................................................................................4

3.1 The Front Panel

3.2 The Rear Panel

4. GETTING STARTED................................................................................................................................6

4.1 Preset Selection

4.2 Edit Menu

4.3 Channel Selection

4.4 Comm Selection:

4.5 SIG/LIMITER LED

5. REMOTE CONTROL ...............................................................................................................................7

5.1 How to set the DPA's ID number

5.2 Connection to the PC

5.3 First Steps with the PC Editor

5.4 Edit Mode (Password Protection)

5.5 Help File

5.6 Introduction to the PC Editor

6. .................................................................................................11PARAMETER MENUS DESCRIPTION

7. ..................................................................................................................11WORKING WETH PRESETS

8. .......................................................................................................................................... 12CONNECTIONS .

9. .......................................................................................................................................13APPLICATION

9.1 Stereo Mode

9.2 Bridge Mode

10. .......................................................................................................... 17TECHNICAL SPECIFICATIONS .

11. WARRANTY..........................................................................................................................................18

1. INTRODUCTION

The LTO DPA900/1500 40 Bit DSP Stereo Amplifier is a high power, low profile, professional Power Amplifier

with In fact, the amplifier functions far beyond a traditional power amplifier,advanced features and great reliability.

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, providing high performance under the most

demanding conditions. It contains two independent channels, with separate AC transformer secondaries, power

supplies and protection system. All protection systems, except the main AC one, are self resetting upon removal

of fault, and the remaining channels shall continue to operate. Each channel has independent protective circuitry against open circuit, short circuit, mismatched loads and over temperature.

Thanks to the use of selected and expensive components, the performance of DPA900/1500 is worth much more

than its price.

2. FEATURE LIST

Built in 40-bit digital effect processor. Remote control through PC link 1 factory preset and 32 user presets by large memory capacity Delay lines up to 582ms for each output Easy to operate front panel controls User-controllable clip limiter. Stereo (dual channel), or bridge mono (bi-amp output) operation mode. Balanced XLR inputs/parallel outputs to ensure noiseless long wiring. Binding post and Neutrik Speakon connectors for outputs. Front panel LED indicators for operating/protection, limiter, power and clip. Manufactured under QS9000, VDA6.1 certified management system.

3. CONTROL ELEMENTS

3.1 Front Panel

CH1

OFF

POWER

1. Power Switch

Turntheunit power ON or OFF.

2. Clip LED

When the signal distortion reaches or surpasses 0.5%, the LED lights up. This means the output level of

signal source is too high and it is time to reduce input level until clip LED turns off.

3. Output Limiter LED

While the unit is limiting the output signal, the LED lights up.

40 BITDSP ENHANCED

Stereo Power Amplifier

23 4

DPA1500

CLIP

LIMIT

OPERATING/ PROTECTION

POWERON

CH2

987

PRESET

VOLUME

EDIT

HUMCANCEL

CHSEL COMM

NOISEGATE MULTICOMP

SIG/LIMITER

SELECT

DOWN

ENTER

LTO

4. Operating and Protection LED

In normal operation, the LED is yellow, if the LED is off, it means the unit is in heat protection, no signal output at

the time and over-heat inside the unit (the surface temperature of power transistor is over 100 ), the temperature

must be lowered through better ventilation and decrease the signal level etc. After the temperature has dro-

pped, the protection stops and meanwhile the LED turns off with the unit recover normal work.

5. Power LED

This LED lights up when the unit is powered.

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 fan speed which controls the inside air flowing speed.

3.2 Rear Panel

12 191815

Apparatenskall anslutas tilljordat uttag nar den anslutstill ett natverk

CH1

BREAKER

BRIDGE

MONO

CH2

RS485IN

RS485OUT

RS232

SERIAL PORT

MODEL

SERIAL

TIP/PIN2 RING/PIN3 SLEEVE/PIN1

1714

POWER OUTPUTS

CH1

CH2

PARALLEL

OUTPUT

PARALLEL

OUTPUT

1+ 1-

POS NEG

CH2

2+ 2-

POS NEG

BRIDGE

LIMITER

MODE

OFF

STEREO

1+ 2+

BRIDGE

POS NEG

OUTPUT1

CH2

1+ 1-

POS NEG

OUTPUT2

1315 16

11. Power Source Socket

It is used to connect power cord after setting the proper voltage, connect one end of power cord with the unit

and another end with mains.

12. Breaker

This switch functions 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 recovered after pushing this switch down again.

13. Output Connector

These connectors have two kinds: Binding post and Speak-on connector. You can choose proper connectors

according to practical need. For your safety, please be careful when do connecting work.

14. Limiter Switch

Set this switch at "ON" position, once the output level is above maximum output level, the limiter begins,

thus keeping consistent output level for protecting apparatus. If the switch is set at "OFF", the limiter function

doesn't work.

15. Balanced Input Connectors

These connectors connect the input signal of channel 1 and channel 2 separately.

16. Parallel Output Connectors

These two output connectors are paralleled inside with the two input connectors. It enables the unit to work under

paralleled mode. Please also refer to wiring diagram for paralleled mode.

17. Mode Selector

Total two optional modes: Up for Stereo mode; Down for Bridge mode.

- Stereo Mode

In this mode, channel 1 and channel 2 operate independently (just as traditional stereo amplifier). The signal

input into channel 1 can be output from channel 1 only, similarly, the signal input into channel 2 can be output

from channel 2 only.You can also operate the paralleled mode via outside wiring, so, the signal input from

channel 1 or 2 will be output from both channel 1 and 2 simultaneously. Details refer to the chapter 9.

- 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 turned down to smallest.Details refer to the chapter 9.

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