User`s Manual - Full Compass
Contents
1. 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 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 Power2. dr inning N I ee Tip O 0 7r TIP SLEEVE SLEEVE TIP Sleeve Q mlm i OO Sleeve Tip O XV ir ra u_u op Ring Ring TIP RING SLEEVE SLEEVE RING TIP Sleeve an __ _r _ _ MI Sleeve uu E Tp O Centre Sleeve Oaa Screen TIP SLEEVE Tipo Centre dee 7 gt ce 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 HPA6 6 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 HPA6 6 Channel Headphone Amplifier on high tem perature devices such as power amplifiers etc to avoid overheating 5 APPLICATION This section introduces some typical applications of your ALTO HPA6 6 Channel Headphone Amplifier Please reserve your time to well understand the control elements see Chapter 3 and the following application examples so as to be able to fully exploit the HPA6 6 Channel Headphone Amplifier 5 1 Use the HPA6 as a Headphone Amplifier This is the basic application for HPA6 6 Channel Headphone Amplifier While using the HPA6 as a Headphone Amplifier please apply the program source to Main Direct In Inputs and connect the headphone cable to o
3. 2 FEATURE LIST Later SiCONTROLELEMEN DS Lloret 3 1 The Front Panel 3 2 The Rear Panel 4 INSTALLATION amp CONNECTION Lilla ai 4 1 Mains Connection 4 2 Audio Connection a Wiring Configuration b In Line Connection 4 3 Rack Mounting 5 APPLICATION curricolo LR 5 1 Use the HPA6 as a Headphone Amplifier 5 2 Use the HPA6 as Independent Power Amplifiers 5 3 The HPA6 in Studio Application 5 4 The HPA6 in Mono Stereo Application 6 TECHNICAL SPECIFICATIONS e cece eee e ee eee e ee eae eee seers eae eeee eae eeeaaaeeeesaaaeeesaaeeeeeaaeed k WARRANTY eri 1 INTRODUCTION Thank you very much for expressing your confidence in ALTO products by purchasing our HPA6 6 Channel Head phone Amplifier With the HPA6 you have acquired an extremely musical and flexible 6 Channel Headphone Amplifier Featuring six stereo headphone amplifiers The ALTO HPA6 6 Channel Headphone Amplifier performs a number of necessary tasks not all of which are headphone related The HPA6 6 Channel Headphone Amplifier provides Main Inputs on the rear panel and Direct In Input on the front panel to drive any or all of the 6 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 HPA6s for expanding The AUX In input on each channel is used to add an additional input signal to the master signal
4. S a C O KZ INPUT GAIN O Q C MAIN SECTION TEES i 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 24dBu to 18dBu 4 Aux In Input 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 5 L Mute Switch The Left input signal will be muted if this switch is activated 6 R Mute Switch The Right input signal will be muted if this switch is activated 7 Mode Switch This push button switches the operational mode between Mono and Stereo Press this button for Mono appli cation and the Mono LED 8 lights up 8 Mono LED This LED informs you the current operational 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 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 control is used to adj
5. 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 CH 1 these are the headphone outputs of Channel 1 Headphone Out2 In Parallel with the Headphone Out on the front panel for CHI 2 these are the headphone outputs of Channel 2 Headphone Out3 In Parallel with the Headphone Out on the front panel for CH 3 these are the headphone outputs of Channel 3 Headphone Out4 In Parallel with the Headphone Out on the front panel for CH 4 these are the headphone outputs of Channel 4 Headphone Out5 In Parallel with the Headphone Out on the front panel for CH 5 these are the headphone outputs of Channel 5 Headphone Out6 In Parallel with the Headphone Out on the front panel for CH 6 these are the headphone outputs of Channel 6 4 INSTALLATION amp CONNECTION 4 1 Mains Connection This is a dual voltage unit Please ensure that the ALTO HPA6 6 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 cord into the unit until voltage has been correctly set Do not plug the power cord into AC power until voltage has been correctly set The mains connection of the ALTO HPA6 6 Channel Headphone
6. of state 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 HPA6 6 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 6 separated channels each channel provides 3 push button switches 2 knob controls 2 phone jacks and 4 LEDs The common main section contains 1knob control 1 jack and 8 LEDs Nothing else to add but that we would like to thank all the people that made the ALTO HPA6 6 Channel Headphone Amplifier a reality available to our customers and thank our designers and all the ALTO staff there to make possible the realization of products containing our idea of music and sound and there to support you our customers in the best way conscious that you are our best richness Thank you very much ALTO AUDIO TEAM TABLE OF CONTENTS I INTRODUGIHON a er rece oe ete te
7. 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 MAIN input onnectors XLR and 1 4 jack Type RF filtered servo balanced input Impedance 50 kOhms balanced 25 kOhms unbalanced Max input level 21 dBu balanced and unbalanced unity gain CMRR typ 40 dB gt 55 dB 1kHz 1 4 TRS tip left ring right sleeve ground Type unbalanced Impedance 25 kOhms unbalanced Max input level 21 dBu unbalanced unity gain CMRR typ 40 dB gt 55 dB 1 kHz AUDIO OUTPUT XLR and 1 4 jack Type balanced unbalanced Impedance dependent on the input impedance Max output level 21 dBu balanced and unbalanced SYSTEM SPECIFICATIONS Op O OD O C gt gt zi Q O O T a la U J m O Z z O S Frequency response 10Hz to 50kHz 3dB IN gt 90dB unweighted 22 Hz to 22kHz gt 95dB 4dBu THD 0 005 typ 4 dBu 1kHz Gain 1 POWER AMPLIFIER Max output power 21dBm Min output impedance 1000hms Max gain 20dB FUNCTION CONTROLS Input level variable Balanced per channel mix between aux and main signal variable FUNCTION SWITCHES SS Max output power Min output impedance Maxgain o SS Inputlevel Balanced per channel as mutes the left signal of the respective channel mutes the right signal of the respective
8. Amplifier is made by using the enclosed mains cord and a standard IEC receptacle It meets all of the international safety certification requirements 4 2 Audio connection The HPA6 6 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 Pin1 4 XLR Type Balanced For these applications the HPA6 6 Channel Headphone Amplifier provides XLR connectors and 1 4 TRS phone jack to easily interface with most professional audio devices Follow the configuration examples below for your particular connection e Balanced ra union ep Tip Q OTP Rigo Ring TIP RING SLEEVE SLEEVE RING TIP ui i fle nia TIP RING SLEEVE Sleeve 3 e Unbalanced Ti ra wi lt A Me Ring oe TIP RING SLEEVE x Sleeve L WN wW N Centre Fie Screen
9. 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 ALTO HPA6 6 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
10. User s Manual H PASO 6 Channel HEADPHONE AMPLIFIER a LTO www altoproaudio com Version 2 0 Dec 2002 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
11. channel switches channel to mono INDICATORS LT 8 digit LED display 24 18 12 6 0 6 12 18dBu 4 digit LED display 24 0 12dBu CLIP POWER SUPPLY E USA Canada 120V 60Hz UK Australi 240V 50Hz N Europe 230V 50Hz 40W 95 120V T500MA L 210 240V T315mA L Standard IEC receptacle 483 W x217 D x44 H mm 19 x8 54 x1 7 2 9kg 6 391b 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 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 wa
12. ne 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 impe dance must over 1000hms 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 HPA6 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 Headphone output2 Headphone output4 Headphone output6 Headphone output1 Headphone output3 Headphone output5 OUTPUT LEVELI a Cc FE HO 5 HPA6 6 Channel ON HEADPHONE AMPLIFIER OFF Co Direct in program Source 5 2 Use the HPA6 as Independent Power Amplifiers Instead of using the HPA6 as the Headphone Amplifier in many particular circumstances it can also be conducted as the independent power amplifiers as for this kind of ap
13. plication 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 six indepen dent stereo program sources to the mixing console and consequently six different and individual monitor facilities for up to six musicians can be created Headphone output2 Headphone output4 Headphone output61 Headphone output1 Headphone output3 Headphone output 5 C HPA6 6 Channel ON HEADPHONE AMPLIFIER HOFF o 5 3 The HPA6 in Studio Application Generally the Aux In Inputs are used to 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 Main di CO HPA6 6 Channel ON HEADPHONE AMPLIFIER ELOFF AUX In 1 Vocal signal 5 4 The HPA6 in Mono Stereo Application The HPA6 6 Channel Headphone Amplifier can be switched between the Mono and Stereo operational mode via Mode Switch control Press
14. rrants 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 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 stat
15. ust the output level of the individual channel 12 Output Level Meter This 4 digit meter tells you the level of the output signal and the range goes from 24dBu to 12dBu 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 3 2 The Rear Panel DA d d d 13 14 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 operation 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 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
16. utory 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 Iwww 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 NF00893 1 0
17. 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 6 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 HPA6 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 CO Excluding 1 knob control 1 jack and 8 LEDs for the common main section the ALTO HPA6 6 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 deo a INPUT LEVEL dBu OUTPUT LEVEL dBu C 24 18 12 6 0 6 12 18 24 0 412 CLIP Di 0 o 0 0 0 a 0 00 Cp 3 L MUTE E 2 10 a Di NCED MA ro DIRECTIN PAUK IN IN HEADPHONE OUT N
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