HPA4 4-Channel Headphone Amplifier
Contents
1. See figure above To change the voltage pull the fuse holder out rotate it 180 and push it back again The operating voltage will be that indicated by one of the two triangular markers AC Inlet After the correct voltage has been set you can connect the AC plug to the unit and in the AC power socket Main Input Connectors These connectors are used to input the stereo signal You can input the main signal via the balanced 1 4 TRS phone jack or XLR connector Main Output Connectors These connectors are used to output the stereo signal You can output the main signal via the balanced 1 4 TRS phone jack or XLR connector In some typical field you can also use these connectors to interlink several Headphone Amplifiers for more groups monitor Headphone Out1 In Parallel with the Headphone Out on the front panel for Channel 1 these are the headphone outputs of Channel 1 Headphone Out2 In Parallel with the Headphone Out on the front panel for Channel 2 these are the headphone outputs of Channel 2 Headphone Out3 In Parallel with the Headphone Out on the front panel for Channel 3 these are the headphone outputs of Channel 3 Headphone Out4 In Parallel with the Headphone Out on the front panel for Channel 4 these are the headphone outputs of Channel 4 4 INSTALLATION amp CONNECTION 4 1 Mains Connection This is a dual voltage unit Please ensure that the ALTO HPA4 4 Channel Headphone Amplifier is set to2. A HPA4 Mamo o prectn T T gt ei ee AMPLIFIER Excluding 1 knob control 1 jack and 8 LEDs for the common main section the ALTO HPA4 4 Channel Headphone Amplifier also contains 3 Push button switches 2 knob controls 2 phone jacks and 4 LEDs for each individual channel 3 1 The Front Panel 0200 WY eur LEVELER J OUTPUr LEVELE 1 C eooo oooo eoo ooojoo oN ome J LE i y CE O 4 C MAIN SECTION E CHANNEL 1 O WOW 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 10 11 12 13 14 The Aux In Input is used to feed the further input signal which can be mixed with the Main Direct In signal via Balanced Control L Mute Switch The Left input signal will be muted if this switch is activated R Mute Switch The Right input signal will be muted if this switch is activated Mode Switch This push button switches the operational mode between Mono and Stereo Press this button for Mono application and the Mono LED 8 lights up Mono LED This LED informs you the c
3. Headphone output 4 oe Fat ener pda ERA SIE ER 0 e cecccce ecccccs ceccccs eccccccs i LE a m H E m a Piel gt lt Aamo o prectn ON HEADPH WE z AMPLIFIER CO CJ Direct in program source 5 2 Use the HPA4 as Independent Power Amplifiers Instead of using the HPA4 as the Headphone Amplifier in many particular circumstances it can also be conducted as the independent power amplifiers as for this kind of application please turn the Balanced Control to complete clockwise By setting the Balanced Control to AUX position the Main signal will then be muted only the signals coming from Aux In Input can be routed to the headphone amplifiers circuit So now you can apply up to four independent stereo program sources to the mixing console and consequently four different and individual monitor facilities for up to four musicians can be created CO Headphone output 1 Headphone output 2 Headphone output 3 Headphone output 4 gurur F LEVEL ABU o o UTEUT hp rat ae LEVEL HRG eooo oooo ecccces eecccce eccccee vin 6 Me H H H a ome Ls i gt lt Fok 15 gt lt gt lt gt lt Aamo DIRECT 5a ON HEADPHOME AMPLIFIER POWER AUX in 1 S AUX in 2 2e sa AUX in 3 kj AUX in 4 eeeveseeane eee 2 eS LC im eee eee ee eee TTET GEGEEEELEEEEEEEE YS 5 3 The HPA4 in Studio Application Generally the Aux In Inputs are used t
4. 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 e Fuse To prevent fire and damage to the product use only 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 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
5. abuse or misuse of this product e Normal tear and wear e The product has been altered or modified in any way e Damage which may have been caused either directly or indirectly by another product force etc e Abnormal service or repairing by anyone other than the qualified personnel or technician And in such cases all the expenses will be charged to the buyer 3 5 In no event shall ALTO be liable for any incidental or consequential damages Some states do not allow the exclu sion or limitation of incidental or consequential damages so the above exclusion or limitation may not apply to you 3 6 This warranty gives you the specific rights and these rights are compatible with the state laws you may also have other statutory rights that may vary from state to state 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 manual is allowed without prior written permission Copyright 2004 Seikaku Technical Group Limited NF0O1185 1 0
6. 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 ALTO HPA4 4 Channel Headphone Amplifier and thanks for choosing the one of results of ALTO AUDIO TEAM job and researches For our ALTO 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 ALTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our R amp D Centres in Italy Netherlands United Kingdom and Taiwan The core of our digital audio products is a sophisticated DSP Digital sound processor and a large range of stat
7. panel and Direct In Input on the front panel to drive any or all of the 4 stereo headphone amplifiers when using the Direct In Input the Main Inputs signal will be interrupted automatically the Main Outputs on the rear panel can be used to interlink any number of HPA4s for expanding The AUX In input on each channel is used to add an additional input signal to the master signal with the corresponding Balanced Control to determine the mix ratio between the two signals In parallel with the Headphone Outputs on the rear panel the Headphone Output on the front panel is also used to output the signal of the individual channel 2 FEATURE LIST e Signal Rack Unit e 4 individual channels e Common input gain control and individual output gain control e Up to 3 headphone outputs per channel e Direct In and Headphone Output on the front panel for easy operation esp used in the rack mounting application e Input and Output Level Meter e Balance Control to mix up the Main In and the Aux In signal e Main Outputs for chaining further HPA4 headphone amplifiers e Maximum audio quality even at high volume levels e Exceptionally rugged construction ensures long life and durability e Universal and professional headphone amplification system for studio and stage application e Manufactured under QS9000 certified quality system 3 CONTROL ELEMENTS nee LEVEL ARU CD ecoooooo eeccccce Oo Cceccces 100 ececcccs OD eeeccece 88 C eu casa n ne H H H
8. OUTPUT XLR and 1 4 jack Type balanced unbalanced Impedance dependent on the input impedance 21 dBu balanced and unbalanced SYSTEM SPECIFICATIONS 10Hz to 50kHz 3dB T O Z OJ gt Ol 3 IRRIS 2 3 S S S 2 3 8 8 D gt 2 x L 5 Z O 5 O S O S O i D ja D Ue aa D lt lt D o 2 o E oF zy 5 m O O D Z 5O C F Noise gt 90dB unweighted 22 Hz to 22kHz gt 95dB 4dBu THD 0 005 typ 4 dBu 1kHz Gain 1 POWER AMPLIFIER re 1000hms FUNCTION CONTROLS mix between aux and main signal 15 15 FUNCTION SWITCHES mutes the left signal of the respective channel mutes the right signal of the respective channel switches channel to mono 8 digit LED display 18 12 6 0 6 12 18dBu CLIP 8 digit LED display 18 12 6 0 6 12 18dBu CLIP POWER SUPPLY USA Canada 120V 60Hz UK Astralin 240V 50Hz ee Europe 230V 50Hz general export model 95 120V 210 240V 50 60Hz 40W 95 120V T315mA L 210 240V T200mA L standard IEC receptacle 483 W x217 D x44 H mm 19 x8 54 x1 7 2 9kg 6 301 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 afte
9. RODUC TION teeta nner etnerC nn teeer es nese teen ee ee ee ee 2 FEATURE COST erect tne E sp ep E E ee E E E emaeneesontes 3 CONTROL ELEMENTS agecseenconcastearcrasaresannbad cesnconccussaeveqsenesnntatinaeusesseunauvie E EEE EE riri 3 1 The Front Panel 3 2 The Rear Panel 4 INSTALLATION amp CONNECTION o cccc ccc cece cece cece ccceccccccececececccecceccaeaceueneauaceteneauaeseeneaesesneeaners 4 1 Mains Connection 4 2 Audio Connection a Wiring Configuration b In Line Connection 4 3 Rack Mounting FE PO IN oreen ea e i E SEAE E A E wad E EE E E EE S S E 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 6 TECHNICAL SPECIFICATIONS oo ciscsnvcuxaxteornnonedocandiecnenssntinneseatieas dnianeidashaneatieetaameveradsvantiuasaneneteyarse tens DMN PS PIE eet csc sige cette et econ eee ec teesceee este ante E ect ogee E te ueceesee ee 1 INTRODUCTION Thank you very much for expressing your confidence in ALTO 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 ALTO 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
10. User s Manual 4 Channel HEADPHONE AMPLIFIER a LTO www altoproaudio com Version 2 0 February 2003 English SAFETY RELATED SYMBOLS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol wherever used alerts you to the pre sence of un insulated and dangerous voltages with in 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 impo rtant 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 CAUTION Describes precautions that should be observed to prevent damage to the product WARNING e 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
11. e of the art algorithms which have been developed by our Software Team for the last 7 years Because we are convinced you are the most important member of ALTO 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 comments Following this idea we create our products and we will create the new ones From our side we guarantee you and we will guarantee you also in future the best quality the best fruits of our continuous researches and the best prices Our ALTO HPA4 4 Channel Headphone 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 a versatile Headphone Amplifier featuring 4 separated channels each channel provides 3 push button switches 4 knob controls 2 phone jacks and 8 digit output level meters The common main section contains 1knob control 1 jack and 8 digit input level meters Nothing else to add but herewith we would like to thank all the people that made the ALTO HPA4 4 Channel Headphone Amplifier a reality available to you and thank our designers and all the ALTO staff who make possible the realization of products containing our idea of music and sound and there to support you our customers in the best way and are conscious that you are our best richness Thank you very much ALTO AUDIO TEAM TABLE OF CONTENTS 12 INT
12. nts see Chapter 3 and the following application examples so as to be able to fully exploit the HPA4 4 Channel Headphone Amplifier 5 1 Use the HPA4 as a Headphone Amplifier This is the basic application for HPA4 4 Channel Headphone Amplifier While using the HPA4 as a Headphone Amplifier please apply the program source to Main Direct In Inputs and connect the headphone cable to one of the appropriate outputs Ensure the Balanced Control adjusted to the complete counter clockwise position and turn up the Input Gain control The Input Gain control is used to boost or attenuate the general volume of all the headphones while the individual Output Gain controls are used to set the desired channel volume Three headphones can be connected per channel each time but please be sure that the resulted connection impedance must over 100o0hms otherwise the output amplified signal may sound a little offensive in terms of long time fault condition usage the headphone amplifiers will be finally damaged or distorted If you still need further headphone ports or more groups headphone amplifier please interlink any number of HPA4 via the Main outputs In parallel with the Headphone Output on the rear panel the Headphone Output on the front panel is also used to output the signal of the individual channel such function proves to be very useful esp in the rack mounting application CO Headphone output 1 Headphone output 2 Headphone output 3
13. o feed a further input signal which can be mixed with the Main Direct In signal via Balanced Control so that well understood this function you can get the wonderwork in the studio field Normal practice if you want to record a vocal track which is intended to ride on an already existing background musical tracks take it easy just use the Main Input to feed the musical background signals and input the Vocal signal through Aux In Background musical signals Headphone Output 1 pS al Aaa C eooo oooo Coccccce 10 Ccccccce aOO i C HEF H om a m om LS HPAG Mamo o RECT 4 Channel ON HEADPHONE AMPLIFIER HOFF POWER CD s AUX In 1 Vocal signal 5 4 The HPA4 in Mono Stereo Application The HPA4 4 Channel Headphone Amplifier can be switched between the Mono and Stereo operational mode via Mode Switch control Press the Mode Switch for Mono application the Mono LED 8 lights up In Mono application the input two signals are combined together and the resulting mono signal routes to both the Left and Right Head phone Out Outputs 6 TECHNICAL SPECIFICATIONS AUDIO INPUT XLR and 1 4 jack Type HF filtered servo balanced input Impedance 40 kOhms balanced 20 kKOhms unbalanced 21 dBu balanced and unbalanced CMRR typ 40 dB gt 55 dB 1kHz 1 4 TRS tip left ring right sleeve ground Type unbalanced Impedance gt 15 kOhms unbalanced 21 dBu unbalanced CMRR typ 40 dB gt 55 dB 1 kHz AUDIO
14. r sales warranty service Please fill out all the information carefully and genuinely miswriting or absence of this card will void your warranty service 2 RETURN NOTICE 2 1 In case of return for any warranty service please make sure that the product is well packed in its original shipping carton and it can protect your unit from any other extra damage 2 2 Please provide a copy of your sales receipt or other proof of purchase with the returned machine and give detail information about your return address and contact telephone number 2 3 A brief description of the defect will be appreciated 2 4 Please prepay all the costs involved in the return shipping handling and insurance 3 TERMS AND CONDITIONS 3 1 ALTO warrants that this product will be free from any defects in materials and or workmanship for a period of 1 year from the purchase date if you have completed the Warranty Registration Card in time 3 2 The warranty service is only available to the original consumer who purchased this product directly from the retail dealer and it can not be transferred 3 3 During the warranty service ALTO may repair or replace this product at its own option at no charge to you for 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 e Instead of operating in accordance with the user s manual thoroughly any
15. ssional audio devices Follow the configuration examples below for your particular connection e Balanced ma fl eed Fe ae n l E l TIP RING SLEEVE SLEEVE RING TIP Pie R o o cu i mm 7 y fle sie TIP RING SLEEVE Sleeve 3 e Unbalanced Ti cu i m rT 8M Ring g oe TIP RING SLEEVE Sleeve oy iM TIP SLEEVE 4 g e lt oO xe WN oO pM cme Centre Screen ca lio oe Tip O OTP TIP SLEEVE SLEEVE TIP Sleeve O sleeve tp O_O Til ra O T lt oo ep Ring Ring TIP RING SLEEVE SLEEVE RING TIP Sleeve 9g S Sleeve cf Aa E O Tp O O Centre Sleeve O s D Screen TIP SLEEVE UDIO m D ONE W ZA gt o TIP RING SLEEVE Sleeve Screen 1 1 2 2 3 3 4 3 Rack Mounting The most secure mounting is on a universal rack shelf available from various rack manufactures or your music 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 the unit for sufficient ventilation and please do not place the HPA4 4 Channel Headphone Amplifier on high temperature devices such as power amplifiers etc to avoid overheating 5 APPLICATION This section introduces some typical applications of your ALTO HPA4 4 Channel Headphone Amplifier Please reserve your time to well understand the control eleme
16. 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 ALTO 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 requirements 4 2 Audio connection The HPA4 4 Channel Headphone Amplifier presents with balanced XLR connectors and 1 4 TRS phone jack and it can be interfaced by several ways to support a variety of applications without any signal loss a Wiring Configuration Either the 1 4 TRS Tip Ring Sleeve phone jack or the XLR servo connector can be wired in balanced and unbalanced modes which will be determined by the actual application status Please wire your systems as the following examples e For 1 4 Phone jack Ring Tip Sleeve TS Type Unbalanced TRS Type Balanced e For XLR connector Pin2 Pin3 Linked to Pin1 manually 4 XLR Type Unbalanced b In Line Connection ba Ring Tip Sleeve TRS Type Unbalanced Pint 4 XLR Type Balanced For these applications the HPA4 4 Channel Headphone Amplifier provides XLR connectors and 1 4 TRS phone jack to easily interface with most profe
17. urrent operational mode Press the Mode Switch 7 for Mono application this LED lights up 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 Balanced Control This control is used to set the proportion between the signal coming from Aux In Input and Main Direct In Input Output Gain Control This control is used to adjust the output level of the individual channel Output Level Meter This 8 digit meter tells you the level of the output signal and the range goes from 18dBu to 18dBu In case of the Clip LED lights up please turn down the Input Gain Control or and the individual Output Gain Control to avoid any distortion Bass Control This knob is used to attenuate or boost the low frequency signal by 15dB Treble Control This knob is used to attenuate or boost the high frequency signal by15dB 3 2 The Rear Panel CRC RI Q O D 15 16 17 18 19 20 21 22 Fuse holder Voltage selector You must be sure of the Voltage available in your Country because this is a Dual Voltage Unit Voltage opera tion can be changed through the fuse protecting the power supply but this operation must be performed by a qualified Engineer THIS IS SET FOR THIS IS SET FOR 110V AC TO 120V 220V AC TO 240V AC OPERATION AC OPERATION Please note the triangular markers on both sides of the fuse holder
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