V4-250 VISCOUNT_V1-0
Contents
1. cn En cH OER Ti Eons switche AOD KAID os nan ow MODE SWITCH SETTINGS This LED lights up when the amplifier is powered on 8 Input Level Indicator Display oF or EAE 7 x x There are three high accurate LED indicators which shows the level of the input signal When the respective channel s output signal distortion exceeds 0 5 the red LED clip indicator lights up it will warn you that the level of the input signal is too high and may cause distortion please attenuate the level of the input signal Use the following formula to determine the fuse capacity according to the speaker s input capacity Protection LED Oo Po l R gt Po R This green LED indicator lights up when the amplifier is powered ON indicating that the soft start protection Po W Speaker s continuous input capacity noise or RMS system is working No sound is output during soft start up if one of the protection systems is activated during R Q Speaker s nominal impedance normal use this indicator lights up and no sound is output The speakers system is actually disconnected from I A Required fuse capacity the amplifier outputs when this indicator lights up The protection systems are activated when overheating As to the speaker cable if you use a long one use as thick a cable as possible to prevent deterioration of the occurs or a DC voltage is corrected the protection systems deactivate automatically this indicator goes out and dampin2. Bridge or parallel operation Ultra low noise and hum High pass filter allow selection of flat 35 Hz or 75Hz protect speakers and prevent speaker transformer saturation with minimal effect on program material DIP switch control for clip limit high pass filter bridge mono selections AUTO variable speed low noise fans ensure high reliability even under demanding conditions Detachable Euroblock Barrier strip input connectors Rugged amplifier in a strong compact chassis 3 CONTROL ELEMENTS 6 CAUTION FOR APPLICATION 3 1 The Front Panel 6 1 General Application instruction the following instructions describe the common ways to install your V4 250 power amplifier into a sound application system First turn off power switch before connection Refer to chapter 5 for speaker connection V4 250 power amplifier may be operated in one of the three modes please slide the mode selector for the Specific operating mode 6 2 caution for speak connection The output capacity of V4 250 power amplifier is very high be sure to use a speaker system that has sufficient input capacity If the input capacity of your speaker system is lower than the rated output of the V4 250 power amplifier you can protect your speakers by connecting a fuse serially between the speaker and the amplifier Power Switch as shown below Fuse It switches on off V4 250 main power i use Speaker System Power LED T EER INPUTS
3. RE AR EER ER Ee AR EA RE GR KEER RR GER Re R KEER RR Ee AR Ee KEER ee ee aaa 1 BLOCK DIAGRAM ees es ede ee os ee RE Ke eg ees ede ie ee Ge ke ee OE ge ee Ee RE Ee Ge bek ee Ee Ge dee 11 8 TECHNICAL SPECIFICATIONS esse ese es sede ee Be ee ge Eie des stent vee hee gus ed nee kes dd ke Ge eg ee Kie de ee ede Dk Ke ee EE NEE 12 9 GET ID AE EE N 13 GEN DUE 8 TECHNICAL SPECIFICATION Model Output Power 20Hz 20KHz O 1 THD stereo Mode 4x180W 4x250W Bridge Mono Mode 2x500W lt 0 05 Frequency Response 20Hz 20kHz 1dB 3dB point 10Hz 60kHz Damping Factor 1kHz 0 1 THDI EIAJ gt 300 8 ohms Signal to Noise 20Hz 20kHz 90dB Voltage Gain 40x 32dB Input sensitivity 4 ohms 1Vrms Input clipping 10 Vrms 22dB Input impedance 10Kohms unbalanced 20 Kohms balanced Controls Front AC Switch Ch1 Ch4 Gain Knobs Rear MODE SWITCHS Indicators Power On Blue LED Protection Green LED LIMITER Yellow LED ip Red LED Parallel input Yellow LED Bridge Yellow LED Level Green LED 20 and 10dB Connectors each channel Input Terminal Block Output Screw terminal Barrier Block cooling Continuously variable speed fan front to rear air flow Load protection On Off muting overheat amp short circuit protection Power supply 220 240 110 120 Vac 50 60 Hz Dimensions 19 48 3 cm rack mounting 3 5 8 9 cm tall 2 rack spaces 15 9 40
4. 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 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 adry 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 9 WARRANTY PREFACE 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 t
5. 3 cm deep rack mounting to rear support ears Net weight 17Kg BLOCK DIAGRAM E S 4 3 D POWER SWITCH m a CIRCUIT BREAKER AC POWER i OUTPUT2 OUTPUT1 FAN BRIDGE D CH3 Heat Protection CHI j d O a aal sa hand 6 IT E 1 e J e N 7 2 cE z n sa 5 58 AI 8 oe x xT Ly 2 i H n Al IE EIS Al IE f ske EES ON EES BEES sl AE EL ef EESERSECESS ag GE ec IB od HE sie OEEBSSSEBER i SBEESSSEBAO HE 9OEESERBEES pal E SEAotABrRR IE iS iS EIE EIE BE LILI N OE N N 28 BE DRIE 22 ELI E amtmonen S SEL RT jaa oO IR z aN Ea 5 8 gE 5 so i 0 58 at U Us 1 xT J xT 2 s g El S s IE ELE naase Le ARES BEES BRSd4 EDE IGEEESSEEBEE ab DEER DEER 8 HEB SEBAD ale OETA A a ma n S E ZENS n EIE Bl el gE JJI 3 N EEN 5 a8 PETET af Bz aw Z aamtnenweac og TT TIK IR 1 INTRODUCTION The V4 250 Four Ch
6. annels Power Amplifier is designed for professional use and provides unparalleled quality It Includes soft start signal limit two variable speed low noise fans and a LED meter display Each channel is equipped with independent protective circuitry against open circuit short circuit mismatched loads and overheat It includes four independent channels with separate power supply Furthermore every channel has also a main LED that becomes green for power on indicator and green for muting or protection another red LED that shows true amplifier clipping and a yellow one for the limit stage The high quality components and the carefully designed circuits ensure excellent audio performance and an extremely linear frequency response giving crystal clear sound in the high range and an up front full bodied bottom end This amplifier guarantees total reliability and a trouble free use even in the most demanding conditions We believe the V4 250 not only look great but provide a perfect performance what you get is unprecedented performance at an incredibly attractive price FEATURE Innovative design and high stability power amplifier Fan cooled AB class high power amplifier in 19 2U size 4 independent channels with separate protection system DC infrasonic overheat amp short circuit protection Smart designed protection system for auto re operation after fault Parallel input channel 1 to channel 2 channel 3 to channel 4 Allow selection of Stereo
7. counterclockwise Then you can control the volume of the whole system by adjusting the channel 1 volume control CH2 Ea H al Erone switches oeeeg cHs puan cH Ban 1 TY ID MODE SWITCH SETTINGS OUTPUTS BRIDGE MODE 12345678 910 3 2 The Rear Panel INPUTS cH nan ce pan E E II rie EEIMODE switches DOOD DUOC KD ao om Han D CH3 oeeeg A INPUT Terminal This unit is provided with balanced terminals which are used to connect the input signal Channel 1 and channel 3 are used in bridge and parallel mode a Mode Selector You can choose the right function and output you need via the mode selector switch In order to make you acquire these settings now let me introduce the dip switch 345678910 This switch is made up of 10 small dip switches these small dip switches from1 to 5 control one channel these rest ones 6 10 control the other channel ok you can choose the right mode setting you need via these small dip switches Take the dip switch of channel 1 and channel 2 for example Channel 3 and channel 4 are the same as channel 1 and channel 2 Output Mode Selector This unit provides three output modes stereo bridge and parallel Here are some details Stereo mode turn these small dip switches of 4 5 6 7 up to the top then channel 1 and channel 2 are in stereo mode STEREO MODE 12345678910 Parallel mode turn these small dip switches of 4 5 6
8. er supply The power supply will be 12345678910 restored with pushing this switch again faalala 4 Ac inlet This standard IEC receptacle is supplied to allow to connect your V4 250 to mains via the supplied power cord 4 Installation 4 1 Mains connection Do not insert the power cord into this unit until voltage has been correctly set Do not plug the power cord into the mains until the voltage has been correctly set Please ensure that the V4 250 professional power amplifi ris supplied with the correct voltage before turning on this unit If you can t power up this unit while turning on the mains switch 1 check the Breaker 14 on the rear panel fist maybe it is pressed to reset Otherwise contact the technician or qualified personnel for any service Caution To reduce the risk of electric shock do not perform any servicing other than contained in this manual unless you are qualified to do so Please turn off this unit before any installation and connection esp when you connect your unit into the sound system This is important to prevent damage to the unit itself as well as other consequent speaker system This is important to prevent damage to the unit itself as well as other consequent speaker system The mains connection of the V4 250 professional power amplifier is made by using the enclosed power cord and a standard IEC receptacle and it meets all of the international safety certification requirement
9. g factor or power loss inside the cable normal amplifier operation is resumed 5 Output Limiter LED Set the clip limit switch at ON position the yellow LED lights up when the unit is limiting the output signal 6 Level Control This pot provides smooth level changes control 7 Fan The unit is equipped with two fans which can accelerate the flow of air to lower the temperature inside unit The inside temperature determines the fan speed which controls the inside air flowing speed Bridge Mode LED Indicator When you operate the unit in bridge mode the LED indicator lights up 9 Parallel Mode LED Indicator When you operate the unit power amplifier in parallel mode the LED indicator lights up 5 2 Operate V4 250 Power Amplifier In Parallel Mode In this mode the channel 1 input signal will be output from the output connectors of both channel 1 and channel 2 The channel 2 input jack is not used The channel 1 and channel 2 volumes can be adjusted independently INPUTS cH nan cHe EA ii N Emone SWT HEER oeeeg Fe Die a de gan BEN Fr hd _ X al bg l Bets pocoo Channel 1 PARALLEL MODE 12345678910 L E w J AF 5 3 Operate V4 250 In Bridge Mode In this mode the channel 1 input signal will be output from the bridge output connectors In this case use the channel 1 volume control to adjust the volume keep the volume control of channel 2 turned completely down
10. 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 VISCOUNT be liable for any incidental or consequential damages Some states do not allow the exclusion 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 ENS TABLE OF CONTENTS 1 INTRODUGTION sees sesse ees ages KERE ek Ee ek ede El dee de dee ek LE KA GN de Ke ER de ee ARE Re VN ed Ed dek Ke GE Weed ERA HER REEDE KG Se 4 2 FEATURES ie io en ee ed ee ee ele ee ee be ee ee eeu ek OE aaae N EER ee EE ee 4 Se CONTROL ELEMENTS niono eae de ee ee ge be deu ee ae eed ee Gee Se Dee ve ku ee des Ee Ui ewe es 5 4 INSTALLATION rerasanan aeaa anaa RR RE KERR KERR EER RE GER sees KEER gee EA AREA ER GR RE GR RR GR EE AEE Re RR Ee AREA seas RR ORR Ra ER KEER KERK EER RE Ee 7 5 APPLICATION ERA ENE LE ER ENE EE EE IE EN 8 6 CAUTION FOR APPLICATION ee ee ee RR EER RE ER KEER
11. les will show you the typical connections you can refer to install your V4 250 into a sound system OFF OFF Filter this unit are equipped with two low cut filter eliminating unwanted low frequency signals like rumble noise 75Hz and 35Hz You will activate 35Hz low cut filter by Turning these two small dip switches of 2 and 9 up to the top and turn these two small dip switches down you will choose 75Hz low cut filter 5 1 Operate V4 250 Power Amplifier In Stereo Mode In this mode channel 1 and channel 2 operate independently as a conventional stereo amp The channel 1 input signal will be output from the channel 1 output jacks and the channel 2 input signal will be output form the channel 2 z m m Z output jacks take channel 1 and channel 2 for example 05 FO oe zg N N z 5 5 5 GEREI ipamana Ce 1 LL 0 4 5 6 7 oe i 0 T a E Jula led Sy See O LL o oc LL DE Et 5 z ii LL LY LU Le gs LU Le LH Ly af de L L 123 Output Terminal Channel 2 You can output the powered signal by the specific output connectors according to the actual application circumstance Caution turn off the unit before connecting the output connectors so as to avoid any electric shock 43 Breaker Channel 2 This switch works as fuse for protecting the unit from damage When the unit is overloaded or the temperature STEREO MODE inside the unit is too high this push button will spring up and break the pow
12. o 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 Abrief 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 VISCOUNT 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 VISCOUNT 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
13. 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 e 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
14. to the top and turn the small dip switch of 7 down then channel 1 and channel 2 are in parallel mode PARALLEL MODE 12345678910 Bridge mode turn these small dip switch of 7 up to the top then channel 1 and channel 2 are in bridge mode BRIDGE MODE 345678910 Imma Please refer to chapter 5 for the connection of loads in detain 6 function selector Clip limit set these small dip switches of 1 ON and 10 ON at ON position then the clip limit of channel 1 and channel 2 has been working once the output level is reach or exceed the level that is predetermined by the threshold setting selected it may result in the undesirable distortion in order to avoid the distortion the clip begins if the dip switch are set at OFF the clip limit doesn t work 4 2 Rack Mounting the most secure mounting is on a universal rack shelf available from various rack manufactures or your music dealer The V4 250 professional power amplifier fits into one standard 19 rack unit of space Be sure that there is enough air space around the unit for sufficient ventilation If heat release is inadequate this unit will retain heat inside which may cause the protection or even a fire CLIP LIMIT 5 Application ON234567890N The V4 250 provides three operating modes with each unit stereo mode parallel mode and bridged mode you can decide each specific operating mode according to your actual application circumstance Following examp
15. viscount Viscount International S p A Via Borgo n 68 70 47836 Mondaino RN ITALY From Italy TEL 0541 981700 FAX 0541 981052 From all other countries TEL 39 0541 981700 FAX 39 0541 981052 E MAIL organs viscount it WEB http www viscount it Users Manual V4 250 FOUR CHANNELS POWER AMPLIFIER V4 250 Four Channels Power Amplifier viscount 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 k 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 Disposing of this product should not be placed in municipal waste and should be mmm SEparate collection 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
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