PROLUDE AMPLIFICATION BHV450 and BHV450L
Contents
1. PROLUDE AMPLIFICATION BHV4 0 and BHV470L Bass amplifier User s manual Table of contents 1 ANTRODUCTION biiviscisscssicctcscccsisstestssssscdsecsesscedsteseascdsssabecstessUcatsesssedduasenscissssssussessovedsaseshcstsusvedesessdive 1 4 1 1 SOME WORDS TO THE CUSTOMER cccccssscsssscccccssssscccssscccesesssscscsccccsscesssscseccccosscessssceeccecesscessssoenses 1 4 1 2 SOME WORDS ABOUT ME b 0k icecccssesosecacsescsecsnssceutesvessossassoenscsescstegecscetdedvessoesessoenaddesvstecesocestedeesssevecsocs 1 4 2 SAFETY INSTRUCTIONS WARNINGS 2 1 BASICPRECAUTIONS sessensensveespesedesosensbosssesveesees 2 5 2 2 WARNINGS USED ON THE EQUIPMENT ccccccssssssscsccccccssssssscsccceccssssscccccccesecssssssccccccesesssssscensccsesesesess 2 5 2 3 GROUNDING INSTRUCTIONS vacessscocssscssonsaceccccesetoscecascvessssencsecdaceoceseceteecsssdevessseonesetuaceorssecetessccsdeceessec 2 5 2 4 CE MARK FOR EUROPEAN HARMONISED STANDARDS ccccccscscscscscscscscscssscscscscccccscsescsesescscccscceseses 2 5 3 SPECIFICATIONS 2 2 sn recens seated Ducere evcsacesliscscsteadvucttedcssdtessscststbecdsartestessasscase 3 6 4 INFORMATION FOR INSTALLING cessssssssssssssnssssssasensssusssussussnssssssnssnsssussnnssussnsssnssussnsssussunenane 4 7 5 CONTROLS AND FUNCTIONS icisssecccscccitecctscatccscssesssseseacsscccsetssesdesssssdensascesseesnssssestecdsdssencsdsusascese 5 8 5 T STHE FRONT PANEL seisccscivsscssesescncsesess2. the system will only lose some of its dynamics 5 13 6 Maintenance cleaning The amplifier has no need for particular maintenance Occasionally check the starting of the ventilator when you switch on the amplifier The preamplifier valve is a long life type probably you will never have to replace it because of aging However if you feel you are losing sound quality you can easily check it by switching on and off the Valve Loop Replacing valves must be done by a qualified person Only replace by using valves of the same type Use only soft and dry or dampened cloth for cleaning Avoid agressive caustic cleaning materials 6 14 6 15
3. Phone and FX Send are not affected by this potentiometer 5 1 11 Mute Mutes the Speaker Outputs the Phone and the Line Out but the FX Send is not affected If the button is pressed the red LED is bright Note This Mute LED gives you additional information too see section 5 1 16 5 1 12 Phone Phone output drives stereo headphones in mono mode lts volume can be controlled by the Gain potentiometer 5 1 13 Foot Sw Footswitch input You can connect a two buttons footswitch here via a stereo jack cable You can activate the Shape function with the first button and bypass the Active Equalization by the second one 5 1 14 Line Out Balanced Line Out with Neutrik XLR connector It gives a high quality line level signal to be used for PA or a recording system The GND Lift button disconnects pin 1 of the XLR connector Note In most cases the GND Lift button has to be unpressed When you get ground loop hum or buzz while connecting to PA or a recording system pressing the button may help to eliminate this The Phone output provides an unbalanced higher signal level You can use it also for connecting to a computer s soundcard 5 1 15 Mains You switch on the amplifier with this switch After switching on there is a ventilator test for about 5 seconds after which the amplifier is in ready mode Important Please avoid switching on and off the amplifier too often especially after playing at high volume level A
4. amplifier Class AB transistor Speaker output connectors Neutrik Speakon Jack combo NLJ2MD H Instrument input connectors Neutrik 6 3mm Jack NMJ4HFD2 Input impedance Passive 500kohms Active 25kohms FX Return 15kohm Active Equalization Low 12dB 40Hz Low Mid 12dB 500Hz Mid 12dB Mid freq 800 3200Hz High 12dB 10kHz shelving type Line out 250mVp 6000hms FX Send 350mVp 2200hms Phone 750mVp 1100hms Working temperature range 0 40 C Storage temperature range 25 60 C Cooling Fixed speed ventilator based on heatsink temperature Weight BHV450 9kg BHV450L 5 2kg Dimensions 2U high 19 rack Width 482mm Depth 255mm 35mm handle Height 88mm 4 Information for installing At high power level it is neccesarry to consider the wiring between the amplifier and speaker cabinets In most cases the amplifier is placed on top of the speaker cabinet therefore a very short speaker cable can be used for connecting the two This is very good because the shorter and thicker the loudspeaker cable the better Do not use an instrument cable for connecting speaker cabinets Use high quality Neutrik SPEAKON SPEAKON speaker cable with at least 2x1 5mm2 or more cross section They are reliable robust and have less influence on the sound Use a speaker cable in good condition and connect the speaker cabinet to the amplifier before you s
5. is also present in the final product The technical development has been a long process so far end it will never come to an end will make further efforts to improve the product thus satisfying the steadily changing expectations of the customer PROLUDE Amplification 2 Safety instructions warnings 2 1 Basic precautions WARNING When using electrical products basic precautions should be followed including the following Read all the instructions before using the product Do not use this product near water for example near a bathtub washbowl kitchen sink in a wet basement or near a swimming pool This product may cause permanent hearing loss Do not operate for long periods of time at a high volume level or at any level that is uncomfortable Make sure nothing interferes with the ventilation of the product when in use The product should be located away from heat sources such as radiators heat registers or other products that produce heat The product should be connected to a power supply of the type described in the operating instructions or as marked on the product The power supply cord of the product should be unplugged from the outlet when left unused for a long period of time Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings The product should be serviced by qualified personnel when The power supply cord or the plug has been damaged or Obje
6. 3 Speaker Outputs Neutrik Speakon Jack combo outlets They are conntected parallel inside the amplifier Both speakon or 6 3mm jack plugs are suitable to connect speaker cabinets One 4ohms or one 8ohms or two 8ohms cabinets can be used Note that the minimum load impedance should not be less than 4ohms Note The speakon connector is a more stable robust and reliable solution Use this if you have one instead of jack Avoid long speaker cables and low quality plugs in order to maintain sound quality and volume The amplifier can be used without speakers as well Warning There is dangerous voltage on the speaker output Connect the cabinets to the amplifier before switching on and do not touch the hot pole of the speaker jack 5 2 4 Ventilation cutouts Do not cover the ventilation cutouts Insufficient ventilating causes overheating which can cause permanent damage to the power stage Note Overheating or fault of power stage is displayed by the Mute LED If this occurs switch off the amplifier wait for 30 minutes before then switching it on again If the Mute LED stays lit after the ventilator test 4 5 seconds then the amplifier has to be brought to a qualified technician for repair 511 5 3 Block diagram Bright Active Eq 16 Control Limiter 7 8 9 Volume Power Speaker Amp Prot 14 Phone Out Noise Gate On 13 Line Out Line Buffer Control GND Lift 5 4 Other functions prote
7. ceustoccedscdesssegateccedsesessceustsccedsecesdceneoescadsesesdcesetecsadessesscesedescosvesesees 5 8 5 2 THE REAR PANEL A foe nae e noon ena eoa ne o ene o ed was eese esee noon eo ge ene eu cn gend eo ease ieaoo e euo P uae Don Roe e Ene D gn 5 11 5 3 ANIOS TA A O 5 12 5 4 OTHER FUNCTIONS PROTECTIONS ssccsscecoscciessscesscasecessvsseoessvespoeesssdscucevescbessessccessvescbecseddccesavessoesseds 5 12 6 MAINTENANCE CLEANING 1 Introduction 1 1 Some words to the Customer Welcome to the club of Prolude Amplification owners It is my pleasure to have you as a member in this small team of people who have taken notice of my handwork and intellectual product and finally have voted for it hope you will feel the same as they do while your amplifier this small part of your musical production chain is reliably working behind you 1 2 Some words about me My name is R bert F l p My favourite musical instrument is the bass guitar lts sound shape and role within the music have all contributed to my enthusiasm To start with my studies and my sphere of interest have both moved me to the direction of electronics As a result PROLUDE AMPLIFICATION was born at the beginning of the new millennium My goal is to provide bass players with the best possible sound quality Being an electrical engineer I m doing it mainly with a technical mindset However according to the feedbacks from my satisfied customers the musicality
8. ch on the Noise Gate with minimal treshold this is the most sensitive setting After some soft playing damp the strings If you recognize the elimination of noise you are finished If you do not recognize it turn up the treshold a little and go back to point three ABI Wrong setting If the threshold is set too low the Noise Gate will not be activated to soften the noise when you stop playing If the threshold is set too high the softening comes too early thus cutting the sustained sound Note The Noise Gate will only work properly at good Gain setting Normally if there is no noise generating effect or stomp box like overdrive or distortion in the signal path there is no need to turn up the treshold level just switch on the Noise Gate 5 1 8 Active Equalization Four band active equalization system with Low Low Mid semi parametric Mid and High controls If you leave the knobs centered you get a linear uncoloured sound You can bypass this feature with the second button of the footswitch 5 1 9 Comp Dynamic compressor At the lowest position of the potentiometer this feature is inactive By turning up it produces more gain and simultanously brings down the threshold level where the limitation starts Generally the softer playing gets more gain than the louder The limitation area is feed back by the blue LED placed left to the Comp knob 5 1 10 Volume Controls the overall volume of the Speaker Outputs The Line Out the
9. ctions 5 4 1 Short circuit protection The amplifier contains a protection circuit against wrong shorted speaker cable or burnt speakers 5 4 2 Speaker protection The speaker cabinets are protected against a possible malfunction of power stage This circuit detaches the speaker cabinets when power stage fault occurs protecting the cabinets from halmful direct current 5 4 3 Click noise reduction The connection of the speaker cabinets is internally delayed after switching on therefore there is no click noise on the speaker cabinets when switching on or off 5 12 5 4 4 Overheat protection Due to insufficient ventilation ventilator fault or too high environment temperature while playing at high volume overheating may occur In such a case the protection circuit detaches the speaker cabinets until the temperature of the power stage cools down This is being displayed by the Mute LED 5 4 5 Ventilator control The control of the cooling ventilator is based on the temperature of the power stage s heatsink It automatically switches itself on when the temperature reaches 60 C and switches itself off when temperature decrease below 50 C Do not cover the ventilation cutouts 5 4 6 Limiter This function protects the power section against distortion When it detects distortion on the output decreases the input signal of the power stage In practise there is no significant distortion on the power stage when you overdrive it
10. cts have fallen or liquid has been spilled into the product or The product has been exposed to rain or moisture or The product does not appear to operate normally or exhibits marked change in performance or The product has been dropped or the enclosure damaged 10 Do not attempt to service the product All servicing should be referred to qualified service personnel 11 For continued protection against the risk of fire replace fuses only with those of the same type and rating 2 2 Warnings used on the equipment f m CAUTION The lightning flash with the arrow head symbol within an equilateral RISK OF ELECTRIC SHOCK DO NOT OPEN triangle is intended to alert the user to the presence of uninsulated dangerous voltage within this product s enclosure that may be of ici j j j j WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK sufficient magnitude to constitute a risk of electric shock A AEREO REDUCE THE RISK OF EIRE OR ELECTRIC EOC The exclamation point within an equilateral triangle is intended to OBJECT FILLED WITH LIQUIDS SUCH AS VASES SHOULD NOT BE alert the user to the presence of important operating and TO PREVENT THE RISK OF FIRE HAZARD REPLACE WITH SAME TYPE aos 50V FUSE maintenance servicing instructions in the literature accompanying THis APPARATUS MUST BE EARTHED DO NOT COVER VENTILATION CUTOUTS this product HIGH VOLUME LEVEL MAY CAUSES HEARING DAMAGE 2 3 Grounding instructio
11. fter playing at high volume level give the ventilator a few minutes to cool down the amplifier before switching it off 5 1 16 Mute LED Multifunctional feedback LED Bright when the Mute button is pressed Or if unpressed after switching on during the ventilator test when the power stage is overheated when the power stage is in a fault state 5 10 5 2 The rear panel 00000000000 MAINS FX LOOP SPEAKER OUTPUTS 00000000000 SEND RETURN CAUTION MODEL BHV450 A RISK OF ELECTRIC SHOCK A A DO NOT OPEN MADE IN EU WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK THIS APPARATUS SHOULD NOT BE EXPOSED TO RAIN OR MOISTURE OBJECT FILLED WITH LIQUIDS SUCH AS VASES SHOULD NOT BE DANGEROUS VOLTAGE PLACED ON THIS APPARATUS POWER A 700W MIN LOAD 40HMS T PREVENT THE RISK OF FIRE HAZARD REPLACE WITH SAME TYPE CLASS 2 wan AN THs APPARATUS MUST BE EARTHED DO NOT COVER VENTILATION CUTOUTS HIGH VOLUME LEVEL MAY CAUSES HEARING DAMAGE 5 2 1 Mains The mains appliance inlet You must use standard earthed mains cord Important This equipment should only be connected to 230VAC 50Hz mains network The mains plug must be plugged into an appropriate outlet that is properly installed and grounded 5 2 2 FX Loop Insert your effects between these jacks FX Send is output FX Return is input If you connect your tuner into this FX Send output you can tune your instrument silently usig the Mute button 5 2
12. ns This product must be grounded earthed If it should malfunction or break down grounding provides a path of least resistance for electric current to reduce the risk of electric shock This product is equipped with a supply cord having an equipment grounding conductor and a grounding plug The plug must be plugged into an appropriate outlet that is properly installed and grounded in accordance with the local codes and ordinances DANGER Improper connection of the equipment grounding conductor can result in a risk of electric shock Check with a qualified electrician or serviceman if you are in doubt as to whether the product is properly grounded Do not modify the plug provided with the product if it will not fit the outlet have a suitable outlet fitted 2 4 CE mark for European harmonised standards The CE mark which is attached to these products means it complies with the EMC Directive 89 69 EEC CE mark directive 93 68 EEC and Low Voltage Directive 72 23 EEC CE 3 Specifications Type BHV450 Description Bass amplifier Mains voltage 230VAC 50Hz Mains connecting device Standard mains cord Inrush current limiter NTC Power supply BHV450 Conventional 700VA toroid transformer BHV450L Resonant switching mode Power consumption 700W Output power 450W Q4Ohms 100Hz continous sine 280W 80hms Minimal load impedance 4Ohms Bandwidth 3dB 1W 7Hz 40kHz Power
13. scribed above is not a rule Adding more Gain will not cause any problem In such a case you get a larger singnal level with some drive especially when the Valve Loop is activated In some situations this can sound good At this point you have to consider the power handling of your speakers because the overdriven sound strains them more If you set the Gain too low the preamp section will not send enough signal to the power stage and the output power may be not enough and may also detain the proper functioning of the Noise Gate 5 1 4 Bright Boosts the highs adding brightness to your sound 5 1 5 Shape Mildly boosts the lows and highs whilst cutting the mids You can switch on this function also with the first button of the Footswitch In this case however the button on the front panel has to be in inactive position 5 1 6 Valve Loop A switchable section in the preamplifier with a double triode valve It gives more warmth to your sound and contains a passive tone control circuit with Bass and Treble knobs This function can be activated with the On button 5 1 7 Noise Gate Automaticly softens down the amplifier during the pauses of your performance Eliminates hum buzz or single coil noise which are audible when you stop playing You can adjust the treshold with the potentiometer The sounds below this treshold are recognized as noise and soften down Setting the treshold Set up your sound and volume on the amplifier Swit
14. witch on the amplifier Try to minimize the number of power strips used to connect the amplifier to the mains Use high quality shielded instrument cable for connecting your instrument to the amplifier At high volume level the speaker cabinet might vibrate so make sure that the placing is stable and the amplifier can not move anywhere 5 Controls and functions 5 1 The front panel Bass Treble Noise Gate 6 dy PROLUDE O O O Amplification Valve Loop Low Low A Mid Freo Hig Volume Line Our Mains 60 999 oS Active Eoualization Q 95 Bass Amplifier 5 1 1 Active Input jack for active instruments 5 1 2 Passive Input jack for passive instruments Note There is no significant difference between the two inputs other than the input impedance and sensitivity The passive instruments and the preamplifierless piezo pickups prefer the Passive input because of its higher impedance and sensitivity 5 1 3 Gain This controls the overal signal level of the preamplifier section Various instruments produce different signal levels The Gain control helps you to set these to the ideal signal level for the preamplifier section The two colour green red LED placed right from the Gain knob is your feed back to set best signal level The Gain setting is OK if the LED is blinking beetween green and red It is OK to go red when you make a powerfull plucking Note The setting de
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