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User's Manual
HPA4 4-Channel HEADPHONE AMPLIFIER
R
LTO
www.altoproaudio.com
Version 2.0 February 2003
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 HPA4 4-Channel Headphone Amplifier and thanks for choosing the one of results of LTO AUDIO TEAM job and researches. For our LTO AUDIO TEAM, music and sound are more than a job...are first of all passion and let us say...our obsession! We have been designing professional audio products for a long time in cooperation with some of the major brands in the world in the audio field. The LTO line presents unparalleled analogue and digital products made by
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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 HPA4 4-Channel Head- phone Amplifier. With the HPA4 you have acquired an extremely musical and flexible 4-Channel Headphone Amplifier. Featuring four stereo headphone amplifiers, the LTO HPA4 4-Channel Headphone Amplifier performs a number of necessary tasks, not all of which are headphone related. The HPA4 4-Channel Headphone Amplifier provides Main Inputs on the rear panel and Direct In Input o
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1. Direct In Input The Direct In Input is used to feed the external program sources into the main signal path, comparing to the Main Input on the rear panel, this input presents the priority character. 2. Input Gain Control This control sets the input signal level coming from Main In. 3. Input Level Meter This meter tells you the level of the main input signal coming from Main/Direct In, and the range goes from -18dBu to +18dBu. 4. Aux In Input The Aux In Input is used to feed the further input
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3.2 The Rear Panel PUSH PUSH AC INPUT TIP/PIN 2 TIP/PIN 2 TIP/PIN 2 TIP/PIN 2 95-120V /210-240V 60-50Hz RING/PIN 3 RING/PIN 3 RING/PIN 3 RING/PIN 3 Rated Power Consumption 40W SLEEVE/PIN 1 SLEEVE/PIN 1 SLEEVE/PIN 1 SLEEVE/PIN 1 220-240V NEW TIDE NEW TIDE FUSE: 210-240V: T200mAL 250VAC 3 3 TIP:L- CHANNEL 95-120V: T315mA 250VAC 21 21 RING:R- CHANNEL REPLACE FUSE WITH CORRECT MIN. LOAD 100OHMS TYPE ONLY Apparaten skall anslutas till jordat uttag nar den ansluts A101 till ett natverk HEADPHONE OUT 4
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4. INSTALLATION & CONNECTION 4.1 Mains Connection This is a dual voltage unit. Please ensure that the LTO HPA4 4-Channel Headphone Amplifier is set to the correct supply voltage before plugging the power cord into the wall outlet, use the same fuse as marked on the 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 L
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1 2 1 2 1 2 1 2 1 2 3 3 3 3 3 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 Centre Sleeve Screen TIP SLEEVE Tip Centre Ring Sleeve Screen TIP RING SLEEVE 1 1 2 2 3 3 4.3 Rack Mounting The most secure mounting is on
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Headphone output 1 Headphone output 2 Headphone output 3 Headphone output 4 INPUT LEVEL(dBu) OUTPUT LEVEL(dBu) 0 0 OUTPUT LEVEL(dBu) 0 0 OUTPUT LEVEL(dBu) 0 0 OUTPUT LEVEL(dBu) 0 0 18 12 6 0 6 12 18 CLIP 18 12 6 0 6 12 18 CLIP 18 12 6 0 6 12 18 CLIP 18 12 6 0 6 12 18 CLIP 18 12 6 0 6 12 18 CLIP MUTE L MUTE R MONO MUTE L MUTE R MONO MUTE L MUTE R MONO MUTE L MUTE R MONO 3 24 HPA4 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 3 3 3 3 R TREBLE BASS TREBLE BASS TREBLE BASS TREBLE BASS 4-Channel 24
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Background musical signals Headphone Output 1 MI ain nput INPUT LEVEL(dBu) OUTPUT LEVEL(dBu) 0 0 OUTPUT LEVEL(dBu) 0 0 OUTPUT LEVEL(dBu) 0 0 OUTPUT LEVEL(dBu) 0 0 18 12 6 0 6 12 18 CLIP 18 12 6 0 6 12 18 CLIP 18 12 6 0 6 12 18 CLIP 18 12 6 0 6 12 18 CLIP 18 12 6 0 6 12 18 CLIP MUTE L MUTE R MONO MUTE L MUTE R MONO MUTE L MUTE R MONO MUTE L MUTE R MONO 3 24 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 HPA4 3 3 3 3 TREBLE BASS TREBLE BASS TREBLE BASS TREBLE BASS R 4-Channel DIRECT IN 24 AUX IN
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6. TECHNICAL SPECIFICATIONS AUDIO INPUT MAIN input XLR and 1/4" jack Connectors Type HF filtered, servo balanced input Impedance 40 kOhms balanced, 20 kOhms unbalanced Max.input level +21 dBu balanced and unbalanced typ.40 dB, >55 dB @ 1kHz CMRR AUX IN and DIRECT IN input 1/4" TRS (tip=left, ring=right, sleeve=ground) Connectors Type unbalanced Impedance >15 kOhms unbalanced Max.input level +21 dBu unbalanced typ,40 dB, >55 dB@1kHz CMRR AUDIO OUTPUT XLR and 1/4" jack Connectors Type balanced /un
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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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SEIKAKU TECHNICAL GROUP LIMITED No. 1, Lane 17, Sec. 2, Han Shi W. Road, Taichung, 401 Taiwan http://www.altomobile.com Tel: 886-4-22313737 email: info@altomobile.com Fax: 886-4-22346757 All 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 c manual is allowed without prior written
