Krell Industries 2250e Owner'S Reference Manual Download

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O W N E R ’ S R E F E R E N C E

EVOLUTION

E V O L U T I O N e S E R I E S A M P L I F I E R S

3 0 2 e , 4 0 2 e A N D 2 2 5 0 e S T E R E O

4 0 3 e A N D 3 2 5 0 e T H R E E - C H A N N E L

4 0 0 e , 6 0 0 e A N D 9 0 0 e M O N A U R A L

KRELL

THE LEADER IN AUDIO ENGINEERING

Summary of Contents for 2250e

Page 1: ...LUTION E V O L U T I O N e S E R I E S A M P L I F I E R S 3 0 2 e 4 0 2 e A N D 2 2 5 0 e S T E R E O 4 0 3 e A N D 3 2 5 0 e T H R E E C H A N N E L 4 0 0 e 6 0 0 e A N D 9 0 0 e M O N A U R A L KRELL THE LEADER IN AUDIO ENGINEERING ...

Page 2: ...ot exposed to dripping or splashing 11 The ventilation slots on the top of every Evolution e Series amplifier the ventilation slots on the back of the Evolution 302e and 400e amplifier and the space underneath every Evolution e Series amplifier must be unobstructed at all times during operation Do not place flammable material above or beneath an Evolution e Series amplifier 12 Before making connec...

Page 3: ...anel Description and Back Panel Description SECTION FOUR Connecting an Evolution e Series Amplifier to Your System page 21 CAST Connections Balanced Connections Single ended Connections Evolution DC Protection Circuitry Using Tube Preamplifiers Connection Steps SECTION FIVE Evolution e Series Amplifier Operation page 23 On Off and Stand by Operation SECTION SIX Troubleshooting System Noise page 24...

Page 4: ... Evolution 302e Back Panel Figure 3 page 16 Evolution 402e Back Panel Figure 4 page 17 Evolution 403e Back Panel Figure 5 page 18 Evolution e Series Monaural Amplifier Back Pane Figure 6 page 20 Evolution 2250e Back Panel FIgure 7 page 21 Evolution 3250e Back Panl Figure 8 page 28 Connection Diagram ...

Page 5: ...ke up the output stage This greater precision elevates an already impressive performance envelope and provides greater amplifier reliability Audible at all volume levels this improvement is independent of load current Although negative feedback in the Evolution amplifiers was already extremely low a mere 14 dB several orders of magnitude lower than other manufacturers power amplifiers modification...

Page 6: ...at incorporates Krell Current Mode and CAST circuitry All amplifiers feature massive power supplies The power supply makes use of extensive electrical and magnetic shielding to keep radiated interference out of critical amplifier circuits The Evolution 302e and Evolution 400e are equiped with a 3000 VA power supply The Evolution 2250e and Evolution 3250e are equipped with a 2500 VA power supply Th...

Page 7: ...interconnects into an electrically linked whole The original signal remains unaltered from source to speaker CAST Basics Here is how a CAST audio system works Internally each CAST source transfers or amplifies current using Krell Current Mode circuitry This current signal is then output using CAST circuitry When the signal is received by a CAST input Krell Current Mode circuitry again takes over u...

Page 8: ...Krell manufactures An all metal body and locking connectors with gold contacts are part of the standard no compromise specification developed for every CAST cable made Evolution CAST By employing revolutionary current mirror circuitry the Evolution e Series amplifier components raises CAST technology to another level This advanced use of the technology increases the linearity transient speed and b...

Page 9: ...nected components to perform as if they are all part of a single circuit CAST and Evolution CAST are balanced connections and reject induced noise Single ended A two wire input or output circuit Single ended connections are not recommended for connections requiring long cable runs Use care when using single ended connections because the ground connection is made last and broken first Turn the syst...

Page 10: ...educing the load on individual devices and improving circuit wide linearity Krell Current Mode A proprietary Krell circuit topology in which the audio gain stages of a component operate in the current domain rather than the voltage domain This unique technology provides the component with exceptional speed and a wide bandwidth SECTION ONE Definition of Terms continued ...

Page 11: ...er cord 1 12 VDC 12 V trigger cable 1 Packet containing the Quick Setup Guide and the warranty registration card 2 Orient the shipping box so that one person stands at the front of the amplifier and one person stands at the back of the amplifier Both people need to grab a pair of the cardboard handle cutouts one pair located at the front of the amplifier and one pair located at the back of the amp...

Page 12: ...nent If you place the amplifier in a closed cabinet you may need to modify shelf spacing or use small fans to increase ventilation When the front and back of a cabinet are open the air space between the chassis and shelf must be unobstructed Place the amplifier s as close to the loudspeakers as possible While Evolution CAST and balanced technology permits long interconnect cable lengths keep louds...

Page 13: ...n e Series Amplifier This section describes Evolution e Series amplifier functions Figure 1 Evolution e Series Amplifier Front Panel Evolution 402e shown 1 Power Button 2 Power Status Indicator Power continued EVOLUTION EVOLUTION 402e 402e 1 2 ...

Page 14: ... amplifier is in stand by mode The indicator illuminates in blue when the amplifier is in operational mode If there is no illumination please check the following items The power cord is connected to the amplifier The power cord is plugged into a live AC power supply The back panel power breaker switch 10 is set to the on position The back panel backlight switch 8 is set to the on ext position Ther...

Page 15: ...AST Inputs 6 Balanced Inputs 7 12 VDC Out In 12 V Trigger 8 Backlight Control 9 IEC Power Cord Receptacle 10 Power Breaker Switch Inputs Outputs Remote Power continued KRELL INDUSTRIES LLC 45 CONNAIR ROAD ORANGE CT 06447 3650 USA e 3400 W max SECTION THREE Anatomy of an Evolution e Series Amplifier continued ...

Page 16: ... 6 Balanced Inputs 7 12 VDC Out In 12 V Trigger 8 Backlight Control 9 IEC Power Cord Receptacle 10 Power Breaker Switch Inputs Outputs Remote Power e KRELL INDUSTRIES LLC 45 CONNAIR ROAD ORANGE CT 06447 3650 USA 3800 W max 4 4 5 5 6 3 7 8 10 9 SECTION THREE Anatomy of an Evolution e Series Amplifier continued continued ...

Page 17: ...le ended Inputs 6 Balanced Inputs 7 12 VDC Out In 12 V Trigger 8 Backlight Control 9 IEC Power Cord Receptacle 10 Power Breaker Switch Inputs Outputs Remote Power SECTION THREE Anatomy of an Evolution e Series Amplifier continued e KRELL INDUSTRIES LLC 45 CONNAIR ROAD ORANGE CT 06447 3650 USA 5000 W max continued ...

Page 18: ... Posts 4 CAST Input 5 Single ended Input 6 Balanced Input 7 12 VDC Out In 12 V Trigger 8 Backlight Control 9 IEC Power Cord Receptacle 10 Power Breaker Switch Inputs Outputs Remote Power SECTION THREE Anatomy of an Evolution e Series Amplifier continued e LLC 2500 W max continued ...

Page 19: ...ngle ended Input 6 Balanced Input 7 12 VDC Out In 12 V Trigger 8 Backlight Control 9 IEC Power Cord Receptacle 10 Power Breaker Switch Inputs Outputs Remote Power KRELL INDUSTRIES LLC 45 CONNAIR ROAD ORANGE CT 06447 3650 USA e 3800 W max 4 5 6 3 7 8 10 9 continued SECTION THREE Anatomy of an Evolution e Series Amplifier continued ...

Page 20: ...on e Series Stereo Amplifier Back Panel Evolution 2250e shown 3 Loudspeaker Binding Posts 4 Single ended Input 5 Balanced Input 9 XLR Sinlge ended Selector Switch 6 12 VDC Out In 12 V Trigger 7 IEC Power Cord Receptacle 8 Power Breaker Switch 10 Speaker Fuses Outputs Inputs Remote Power ...

Page 21: ...e Series Three Channel Amplifier Back Panel Evolution 3250e shown 3 Loudspeaker Binding Posts 4 Single ended Input 5 Balanced Input 9 XLR Sinlge ended Selector Switch 6 12 VDC Out In 12 V Trigger 7 IEC Power Cord Receptacle 8 Power Breaker Switch 10 Speaker Fuses Outputs Inputs Remote Power ...

Page 22: ...Remote Connections 7 12 VDC In Out 12 V Trigger In The 12 V trigger allows you to turn the Evolution e Series amplifier on or to stand by from other components Out The output sends 12 VDC 12 V trigger power on off signals to other Krell components and other devices that incorporate a 12 V trigger allowing whole systems or parts of systems to be easily controlled remotely Mono 3 5 mm connectors are...

Page 23: ...the factory default position Off This turns off the power status indicator during normal operation The power status indicator remains illuminated for ten seconds after the power buton is pressed Power 9 IEC Power Cord Receptacle The power receptacle is for use with the provided 20 amp AC power cord Use only the power cord supplied with your Evolution e Series amplifier 10 Power Breaker Switch Plac...

Page 24: ... 6 12 VDC In Out 12 V Trigger In The 12 V trigger allows you to turn the Evolution e Series amplifier on or to stand by from other components Out The output sends 12 VDC 12 V trigger power on off signals to other Krell components and other devices that incorporate a 12 V trigger allowing whole systems or parts of systems to be easily controlled remotely Mono 3 5 mm connectors are used in the follo...

Page 25: ...d 20 amp AC power cord Use only the power cord supplied with your Evolution e Series amplifier 8 Power Breaker Switch Place this switch in the up position to put the amplifier in stand by mode Place the switch in the down position to turn off the amplifier 10 Speaker Fuses The speaker fuse protects the 2250e and 3250e in case of overload or malfuction ...

Page 26: ...ions Krell recommends using its proprietary Krell CAST system for unparalleled sonic performance for connections between the Evolution e Series amplifier and other CAST equipped components Krell CAST uses flexible interconnecting cables that can be drawn through tight spaces and concealed Balanced Connections The Evolution e Series amplifier also offers balanced operation The circuitry and connect...

Page 27: ...ed noise from being introduced into the system 3 Connect the outputs of your preamplifier to the appropriate CAST 4 balanced 6 or single ended inputs 5 on the Evolution e Series amplifier Note Connect the u shaped jumpers between pins 1 and 3 of the XLR connectors when using single ended inputs On 2250e and 3250e toggle the Input Select Switch to single ended 4 Connect the loudspeaker cables to th...

Page 28: ...28 SECTION FOUR Connecting an Evolution e Series Amplifier to Your System continued Figure 8 Connection Diagram ...

Page 29: ...0 to the down position and while pressing the power button 1 on the amplifier front panel return power breaker switch 10 to the up position Repeat the procedure to return to the green operating mode 2 Press the power button 1 on the amplifier front panel The power status indicator 2 illuminates in blue The initial power up phase lasts approximately 30 seconds from the moment the back panel power b...

Page 30: ...reaker switch remains in the on position 1 Check that all input and output connections are of sound construction 2 With the amplifier in stand by mode remove the interconnect cables then turn the amplifier on If the hum disappears turn the amplifier into stand by mode again and reinsert one of the interconnect cables Turn the amplifier back on Repeat this process for each cable 3 If the hum reappe...

Page 31: ...tact your Dealer Distributor or the Krell Factory 3 flashes Excessive Output Current Check loudspeaker and cables for short circuits If you are driving more than one loudspeaker per channel check that thecombined load does not drop below 2 Ohms The power breaker switch must be shut off to reset the fault condition 4 flashes Excessive temperature Allow the amplifier to cool and increase ventilation...

Page 32: ...ts and cables are sound you may be experiencing a ground loop This can often be easily eliminated Please contact your authorized Krell dealer distributor or Krell for suggestions on how to solve this problem Q My loudspeakers are rated for 150 Watts Are the Evolution models too powerful for them A No A loudspeaker seldom is damaged from overdriving More often damage occurs when an amplifier that l...

Page 33: ...dental or consequential damages arising from purchase use or inability to use the product even if Krell has been advised of the possibility of such damages IMPORTANT The single ended inputs on the Evolution e Series amplifiers are capacitor coupled Use these inputs whenever you are connecting a tube preamplifier Proof of purchase in the form of a bill of sale or receipted invoice substantiating th...

Page 34: ...to Krell for exchange become the property of Krell No expressed or implied warranty is made for any Krell product damaged by accident abuse misuse natural or personal disaster or unauthorized modification Any unauthorized voltage conversion disassembly component replacement perforation of chassis updates or modifications performed to the product will void the warranty The operating voltage of the ...

Page 35: ...lso be hand delivered if arrangements with the Service Department have been made in advance Proof of purchase will be required for warranty validation at the time of hand delivery IMPORTANT Use the original packaging to ensure the safe transit of the product to the factory dealer or distributor Krell may at its discretion return a product in new packaging and bill the owner for such packaging if t...

Page 36: ...A peak 37 A peak SLEW RATE 120 V µs 100 V µs OUTPUT IMPEDANCE 0 040 Ohms at 20 Hz 0 053 Ohms 20 Hz to 20 kHz 0 055 Ohms at 20 Hz 0 064 Ohms 20 Hz to 20 kHz DAMPING FACTOR Referred to 8 Ohms 200 at 20 Hz 150 20 Hz to 20 kHz 145 at 20 Hz 125 20 Hz to 20 kHz POWER CONSUMPTION Stand by High Current Stand by Idle Maximum 2 W 150 W 320 W 3400 W 2 W 260 W 390 W 3800 W HEAT OUTPUT Stand by High Current St...

Page 37: ...37 A peak 37 A peak SLEW RATE 100 V µs 100 V µs OUTPUT IMPEDANCE 0 055 Ohms at 20 Hz 0 064 Ohms 20 Hz to 20 kHz 0 055 Ohms at 20 Hz 0 064 Ohms 20 Hz to 20 kHz DAMPING FACTOR Referred to 8 Ohms 145 at 20 Hz 125 20 Hz to 20 kHz 145 at 20 Hz 125 20 Hz to 20 kHz POWER CONSUMPTION Stand by High Current Stand by Idle Maximum 2 W 370 W 570 W 5000 W 2 W 150 W 210 W 2500 W HEAT OUTPUT Stand by High Current...

Page 38: ... V peak to peak 85 V rms OUTPUT CURRENT 49 A peak 60 A peak SLEW RATE 100 V µs 90 V µs OUTPUT IMPEDANCE 0 030 Ohms 20 Hz to 20 kHz 0 023 Ohms 20 Hz to 20 kHz DAMPING FACTOR Referred to 8 Ohms 270 20 Hz to 20 kHz 350 20 Hz to 20 kHz POWER CONSUMPTION Stand by High Current Stand by Idle Maximum 2 W 260 W 410 W 3800 W 2 W 440 W 650 W 5000 W HEAT OUTPUT Stand by High Current Stand by Idle Maximum 7 BT...

Page 39: ...eak SLEW RATE 80 V µs 80 V µs OUTPUT IMPEDANCE 0 060 Ohms at 20 Hz 0 067 Ohms 20 Hz to 20 kHz 0 060 Ohms at 20 Hz 0 067 Ohms 20 Hz to 20 kHz DAMPING FACTOR Referred to 8 Ohms 130 at 20 Hz at 8 Ohms 120 20 Hz to 20 kHz at 8Ohms 130 at 20 Hz at 8 Ohms 120 20 Hz to 20 kHz at 8Ohms POWER CONSUMPTION Stand by High Current Stand by Idle Maximum 2 W 40 W 90 W 2400 W 2 W 50 W 125 W 2400 W HEAT OUTPUT Stan...

Page 40: ... 4 7 7 3 6 5 0 U S A T E L L 2 0 3 2 9 8 4 0 0 0 FA X 2 0 3 8 9 1 2 0 2 8 E M A I L s a l e s k r e l l o n l i n e c o m h t t p w w w k r e l l o n l i n e c o m E V O L U T I O N e S E R I E S A M P L I F I E R S 3 0 2 e A N D 4 0 2 e S T E R E O 4 0 3 e T H R E E C H A N N E L 6 0 0 e A N D 9 0 0 e M O N A U R A L ...

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