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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 Panel

4. INSTALLATION & CONNECTION

........................................................................................................7

4.1 Mains Connection

4.2 Audio Connection

a. Wiring Configuration

b. In Line Connection

4.3 Rack Mounting

5.1 Use the HPA4 as a Headphone Amplifier

5.2 Use the HPA4 as Independent Power Amplifiers

5.3 The HPA4 in Studio Application

5.4 The HPA4 in Mono/Stereo Application

5. APPLICATION

.........................................................................................................................................8

6. TECHNICAL SPECIFICATIONS

...........................................................................................................11

7.WARRANTY

..........................................................................................................................................12

Содержание HPA4

Страница 1: ...User s Manual LTO R www altoproaudio com Version 2 0 February 2003 English HPA4 4 Channel HEADPHONE AMPLIFIER ...

Страница 2: ...y 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 wir...

Страница 3: ...on Thank you very much LTO AUDIO TEAM DSP Digital sound processor and a large range of state of the art algorithms which have been developed by our Because we are convinced you are the most important member of LTO AUDIO TEAM and the one confirming the quality of our job we d like to share with you our work and our dreams pay attention to your suggestions and your Following this idea we create our ...

Страница 4: ...TION 7 4 1 Mains Connection 4 2 Audio Connection a Wiring Configuration b In Line Connection 4 3 Rack Mounting 5 1 Use the HPA4 as a Headphone Amplifier 5 2 Use the HPA4 as Independent Power Amplifiers 5 3 The HPA4 in Studio Application 5 4 The HPA4 in Mono Stereo Application 5 APPLICATION 8 6 TECHNICAL SPECIFICATIONS 11 7 WARRANTY 12 ...

Страница 5: ...tputs for chaining further HPA4 headphone amplifiers Maximum audio quality even at high volume levels Exceptionally rugged construction ensures long life and durability Universal and professional headphone amplification system for studio and stage application Manufactured under QS9000 certified quality system Excluding 1 knob control 1 jack and 8 LEDs for the common main section the LTO HPA4 4 Cha...

Страница 6: ...onal mode Press the Mode Switch 7 for Mono application this LED lights up 9 Headphone Out Output In parallel with the Headphone Output on the rear panel this 1 4 TRS phone jack is also used to output the signal of the individual channel 5 10 Balanced Control This control is used to set the proportion between the signal coming from Aux In Input and Main Direct In Input 11 Output Gain Control This c...

Страница 7: ... fuse protecting the power supply but this operation must be performed by a qualified Engineer 220 240V 110 120V 110 120V 220 240V MAIN INPUT LEFT MAIN INPUT RIGHT MAIN OUTPUT RIGHT MAIN OUTPUT LEFT HEADPHONE OUT 4 HEADPHONE OUT 3 HEADPHONE OUT 2 HEADPHONE OUT 1 TIP L CHANNEL RING R CHANNEL MIN LOAD 100OHMS AC INPUT 95 120V 210 240V 60 50Hz Rated Power Consumption 40W FUSE 210 240V T200mAL 250VAC ...

Страница 8: ...fuse holder at the AC power connection socket Do not insert power cable into the unit until voltage has been correctly set Do not plug the power cable into AC power until voltage has been correctly set The mains connection of the LTO HPA4 4 Channel Headphone Amplifier is made by using the enclosed mains cable and a standard IEC receptacle It meets all of the international safety certification requ...

Страница 9: ... 3 TIP SLEEVE TIP SLEEVE TIP RING SLEEVE TIP RING SLEEVE 1 2 3 2 1 3 2 1 3 Tip Ring Sleeve 1 2 3 Tip Sleeve 1 2 3 TIP RING SLEEVE TIP SLEEVE 1 2 3 1 2 3 SLEEVE TIP SLEEVE RING TIP dealer The HPA4 4 Channel Headphone Amplifier fits into one standard 19 rack unit of space Please allow at least an additional 4 depth for the connectors on the rear panel Be sure that there is enough air space around th...

Страница 10: ...IN 2 4 5 6 1 0 3 CHANNEL 2 CHANNEL 3 CHANNEL 4 ON OFF POWER MUTE MUTE MUTE MUTE MAIN IN MAIN IN MAIN IN AUX BALANCE MAIN IN 3 0 12 CLIP 18 12 6 6 0 CLIP 18 12 6 6 18 18 18 12 18 18 R LTO INPUT LEVEL dBu DIRECT IN INPUT GAIN OUTPUT LEVEL dBu MUTE R L 3 MONO 2 4 5 6 1 0 4 Channel HEADPHONE AMPLIFIER HPA4 0 15 15 CHANNEL 1 BASS HEADPHONE OUT TREBLE OUTPUT GAIN 0 AUX IN 15 15 2 4 5 6 1 0 3 0 12 CLIP O...

Страница 11: ...5 15 2 4 5 6 1 0 3 0 12 CLIP OUTPUT LEVEL dBu 18 12 6 6 MUTE R L MONO AUX BALANCE OUTPUT GAIN 2 4 5 6 1 0 0 15 15 BASS HEADPHONE OUT TREBLE 0 AUX IN 15 15 0 12 CLIP OUTPUT LEVEL dBu 18 12 6 6 MUTE R L MONO AUX BALANCE OUTPUT GAIN 2 4 5 6 1 0 3 MAIN SECTION 0 15 15 BASS HEADPHONE OUT TREBLE 0 AUX IN 15 15 0 12 CLIP OUTPUT LEVEL dBu 18 12 6 6 MUTE R L MONO 0 15 15 BASS HEADPHONE OUT TREBLE 0 AUX IN ...

Страница 12: ... typ 4 dBu 1kHz Gain 1 21dBm 100Ohms variable mix between aux and main signal variable mutes the right signal of the respective channel mutes the left signal of the respective channel switches channel to mono 40 W 2 9kg 6 39lb 8 digit LED display 18 12 6 0 6 12 18dBu CLIP POWER AMPLIFIER FUNCTION CONTROLS FUNCTION SWI CHES T POWER SUPPLY PHYSICAL INDICATORS 483 W D H mm 19 8 54 1 7 217 44 Max outp...

Страница 13: ...d LTO of 1 year from the purchase date if you have completed the Warranty Registration Card in time 3 3 During the warranty service may repair or replace this product at its own option at no charge to you for LTO parts or for labor in accordance with the right side of this limited warranty 3 4 This warranty does not apply to the damages to this product that occurred as the following conditions Nor...

Страница 14: ...ll rights reserved to ALTO Mobile Due to continued development in response to customer feedback product features specifications and or internal external design may be changed without prior notice No photocopying translation or reproduction of any part of this user manual is allowed without prior written permission Copyright 2004 Seikaku Technical Group Limited c NF01185 1 0 ...

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