Krell Industries Evolution Two Owner'S Reference Manual Download Page 5

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A Letter from Dan D’Agostino

Dear Audio Enthusiast,

Thank you for your purchase of the Evolution Two preamplifier.

My new Evolution products represent a watershed in my design philosophy and in

my quest for audio components that deliver absolute truth in music reproduction.

The expanse of the Evolution Two monaural design has allowed me to explore

fully the advantages of current mode topologies. The resulting circuit utilizes no

feedback and has a bandwidth of 2 MHz.

I have always been fascinated by the artistry inherent in great musical performanc-

es, and my new Evolution Two preamplifier delivers the these performances in

their entirety, unaltered, to the amplifier. At the same time, the Evolution Two pre-

amplifier provides the flexibility and control necessary for the listener to thoroughly

enjoy a high performance audio system. It is my pleasure to make the Evolution

products available to you.

The preamplifier plays a vital role in audio playback. At no other point in the repro-

duction process is the music so vulnerable to change. The signal level at the pre-

amplifier stage is small, and is particularly susceptible to noise and distortion. In

order to solve this problem, the Evolution Two employs Krell Current Mode gain

stages from input to output, and Current Audio Signal Transmission (CAST)

receivers and transmitters. Unprecedented in Krell design history, these unique

topologies combine in the Evolution Two preamplifier to form a circuit that has no

audible sonic signature.

The Evolution Series represents a new direction for Krell, where breakthrough cir-

cuit topologies also represent the vanguard in convenience and control. Sophisti-

cated communication circuitry allows from two to eight preamplifiers to be linked

to a single master from which all user interface is accomplished. The Evolution

Two Monaural Preamplifier is designed to complement perfectly the Evolution One

Monaural Power Amplifier. Combine the Evolution One and Two with my new

LAT-1000 loudspeakers, and experience the extraordinary capabilities of an

Evolution System.

continued

Summary of Contents for Evolution Two

Page 1: ...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 T W O M O N A U R A L P R E A M P L I F I E R ...

Page 2: ...d by mode Make sure all cable terminations are of the highest quali ty free from frayed ends short circuits or cold solder joints Do not connect an RS 232 cable to the phono power port Output from the phono power port can seriously damage your computer Do not connect the cable from a Krell KPE phono stage to the RS 232 port THERE ARE NO USER SERVICEABLE PARTS INSIDE AN EVOLUTION TWO MONAURAL PREAM...

Page 3: ...ge 15 Front Panel Description Remote Control Description and Back Panel Description SECTION FIVE Connecting the Evolution Two to Your System page 26 Input and Output Connections Connection Steps Connections Using CAN Link SECTION SIX Evolution Two Operation page 29 On Off and Stand by Operation Play and Record Operation Using CAN Link SECTION SEVEN Customizing the Evolution Two page 32 Navigation ...

Page 4: ...wo Preamplifier Chassis and Power Supply Chassis Front Panels Inset Evolution Two Preamplifier Channel Front Panel View Figure 2 page 16 Evolution Two Remote Control Figure 3 page 22 Evolution Two Preamplifier Chassis and Power Supply Chassis Back Panels ...

Page 5: ...l role in audio playback At no other point in the repro duction process is the music so vulnerable to change The signal level at the pre amplifier stage is small and is particularly susceptible to noise and distortion In order to solve this problem the Evolution Two employs Krell Current Mode gain stages from input to output and Current Audio Signal Transmission CAST receivers and transmitters Unp...

Page 6: ...ution technologies that power the amplifier and preamplifier this Evolution source will expose the real advantages of the latest recording formats while taking compact disc playback to the next level I encourage you to audition it as soon as it is released Sincerely Daniel D Agostino Chief Executive Officer 2 A Letter from Dan D Agostino continued ...

Page 7: ...roduct excellence The company s history is replete with product introductions that have deeply impacted the high end audio industry The most discriminating audiophiles and product reviewers have consistently recog nized Krell components for standard setting performance From the company s inception to the present Krell C E O Dan D Agostino has continually pushed the envelope of performance in audio...

Page 8: ...riginal 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 until the signal reaches the loudspeaker By maintainin...

Page 9: ... Krell manufactures An all metal body and locking connectors with gold contacts are part of the standard no compromise specification devel oped for every CAST cable made Evolution CAST By employing radical current mirror circuitry the Evolution components elevate the CAST technology to another level This advanced use of the technology increases the linearity transient speed and bandwidth of the Ev...

Page 10: ... The voltage signals are then converted into balanced current signals the form in which they remain through the remainder of the signal path The audio signal remains in the current domain throughout the entire preamplifier Only at the single ended and voltage outputs is it converted back to the voltage domain All signal gain is realized in the current domain using proprietary multiple output curre...

Page 11: ...tor input allowing the opportunity to use home or professional recording equipment Separate Power Supply Housed in a separate chassis the power supply makes use of extensive electrical and magnetic shielding to keep radiated interference out of critical preamplifier cir cuits Internal line conditioning circuitry filters RF noise on the AC power and compensates for asymmetric power waveforms and DC...

Page 12: ...play brightness and 12 volt triggers Integration is supported via RS 232 12 Volt trigger and RC 5 inputs as well as an IR transmitter for programming a learning remote control A built in digital network allows multiple preamplifiers to be linked together blend ing the convenience of a single chassis stereo preamplifier with the sonic perform ance obtainable only from individual monaural preamplifi...

Page 13: ...tions balanced connections have 6 dB more gain than single ended connections and allow the use of long interconnect cables Balanced connections are completely immune to induced noise from the system or the environment CAST and Evolution CAST Krell Current Audio Signal Transmission or CAST is a proprietary Krell circuit tech nology for connecting analog components transmitting the audio waveform be...

Page 14: ...ve IR RC 5 and RS 232 data from a right terminated preamplifier channel or transmitter Operation Off When the stand by power LEDs and the backlight grid are not illuminated the pre amplifier is off Stand by A low power consumption status that keeps the audio and regulator circuits at idle The stand by power LEDs are illuminated in red when the preamplifier chan nel is in the stand by mode Krell re...

Page 15: ... in 43 8 cm wide by 3 7 in 9 5 cm high by 17 3 in 43 8 cm deep and weighs 31 lbs 14 kg Left Right Channel Orientation Evolution Two preamplifier channels are assembled as left or right channels Preamplifier RCA connectors 31 36 38 40 are color coded Left preamplifier channels are assembled with white RCA connectors and right preamplifier chan nels are assembled with red RCA connectors To Remove th...

Page 16: ...on to select a location for your component This will facili tate a clean trouble free installation The Evolution Two preamplifier does not require a special rack or cabinet for installation Each preamplifier channel measures 17 3 in 43 8 cm wide by 7 3 in 18 5 cm high by 18 5 in 47 cm deep The Evolution Two preamplifier requires at least 2 inches of clearance on each side and at least two inches o...

Page 17: ...pplies together 2 In order to operate the Evolution Two preamplifier in linked mode connect the preamplifier channels together with the supplied RJ 45 control cable In linked mode functions including power volume balance phase record mute and input selections are instantaneously transmitted between linked preamplifier channels When a system with linked preamplifier channels is powered on left righ...

Page 18: ...volution Two is connected to your system and to AC power and the front panel display 15 has stopped scrolling begin operation 1 Press the power button on either preamplifier chassis front panel or the pwr key 3 on the remote control The blue backlights illuminate the red stand by LEDs 4 turn off and the front panel displays read INITIALIZING The front panel displays show the factory default input ...

Page 19: ...tion Buttons 9 Balanced Input Selection Buttons 10 CAST Input Selection Buttons 11 Tape Button and LED 12 Mute Button and LED 13 Record Button and LED 14 Phase Button and LED 15 Front Panel Display 16 Level Control Knob 17 Menu Button 18 Enter Button 19 Preamplifier Chassis Feet 20 Power Supply Chassis Feet Inset Evolution Two Preamplifier Channel Front Panel View 1 3 4 5 8 9 10 11 12 13 14 16 6 7...

Page 20: ...1 Main Bus Key 22 Balance Key 16 Level Keys 17 Menu Key 18 Enter Key 23 Pause Key 24 Play Key 25 Stop Key 26 Track Forward and Back Key 27 Search Forward and Back Key 28 Amplifier Power Key 29 Meter Select Key 18 17 28 29 8 3 12 13 14 21 11 26 27 16 23 24 9 10 22 25 SECTION FOUR Anatomy of an Evolution Two continued Power Preamplifier Functions Level Navigate Customize CD Functions Amplifier Funct...

Page 21: ...tand by LED The red stand by LEDs on the preamplifier and the power supply illuminate when the Evolution Two is plugged into a standard AC wall receptacle indicat ing that the Evolution Two is ready to be switched to the operational mode The stand by LEDs flash when remote control signals are received 5 Power Backlight The blue power backlight illuminates when the Evolution Two is in the opera tio...

Page 22: ...ation see Tape Input on page 46 12 Mute Button and LED or Key Use this button or key to mute the preamplifier channel output To unmute press the mute button again The red mute LED illuminates when mute is selected To customize mute operation see Mute on page 42 13 Record Button and LED or Key Use this button or key to select the desired input for the record bus The red record LED illuminates when ...

Page 23: ...tomize the Evolution Two See Customizing the Evolution Two on page 32 Navigate Customize 17 Menu Button or Key Use this button or key to access the menu functions of the Evolution Two For more information see Customizing the Evolution Two on page 32 18 Enter Button or Key Use this button or key to configure the menu functions of the Evolution Two For more information see Customizing the Evolution ...

Page 24: ...wrench 2 Install the batteries following the battery position diagram on the plastic bat tery receptacle 3 Replace and secure the backplate Notes Replace batteries when remote control function becomes intermittent Remove batteries if the remote control is not used for a long period of time Battery leakage can damage the remote control Preamplifier Functions 21 Main Bus Key Use this key to select t...

Page 25: ...k Keys Use these keys to select and begin playing the track that follows or precedes the current track 27 Search Forward and Back Keys Press and hold these keys to scroll forward or backward through the current track Note For information on track programming functions refer to the owner s reference of your Krell compact disc player Amplifier Functions 28 Amp Pwr Key Use this key to activate Krell ...

Page 26: ...ord Bus Balanced Tape Output 38 Record Bus Single ended Tape Output 39 Balanced Main Output 40 Single ended Main Output 41 CAST Outputs 42 RC 5 Input 43 RC 232 Input 44 12 VDC In Out 45 CAN Link In Out 46 Phono Power Port 47 DC Power Connector 48 IEC Power Cord Receptacle 33 30 31 46 47 48 1 2 34 32 41 35 39 40 44 47 42 43 45 SECTION FOUR Anatomy of an Evolution Two continued POWER PHONO POWER FUS...

Page 27: ... 3 S 4 The Evolution Two is equipped with 4 single ended analog source inputs with RCA connectors 32 33 Tape Inputs B 3 and S 4 The Evolution Two is equipped with one balanced and one single ended input for use with a tape source Either input may be configured as the tape input from the menu 17 When you select the tape input 11 the other input becomes a normal input selectable using the front pane...

Page 28: ...tion A stereo tip ring sleeve 1 8 mini connector is used in the following configuration Tip RC 5 data Ring 5 V Sleeve GND 43 RS 232 Each Evolution Two preamplifier chassis 1 has an RS 232 port that receives messages from a computer based control system providing integrated control of all preamplifier functions The RS 232 input uses a 9 pin D subminiature connector See the Evolution Two developer s...

Page 29: ...reamplifier chassis 1 has 2 RJ 45 link connectors con nected in parallel These are used to operate preamplifier channels in linked mode For more information see Connections Using CAN Link on page 28 Operation Using CAN Link on page 31 and Link Control on page 41 Phono Stage Connector 46 Phono Power Port Each power supply chassis 2 has a phono power port for connecting the preamplifier to a Krell K...

Page 30: ...ion not only can minimize sonic loss but also are immune to induced noise especially for installations using long cables XLR Pin Configuration Pin 1 Ground Pin 2 Non inverting 0O Pin 3 Inverting 180O Inputs and outputs are located on the Evolution Two back panels Maintain the correct left right orientation when hooking up your system Left Right Channel Orientation Evolution Two preamplifiers are a...

Page 31: ... and from the Evolution Two preamplifier and all components Separate AC wires from audio cables to prevent hum or other unwanted noise from being introduced into the system 4 Connect the outputs of your source equipment to the appropriate CAST 34 balanced 30 single ended 31 or tape inputs 32 33 on the Evolution Two 5 Connect the appropriate main outputs 35 41 on the Evolution Two to your amplifier...

Page 32: ...ion Two Preamplifiers via CAN Link After the power supply chassis is connected to the preamplifier chassis with the 12 pin DC cable 1 Connect one RJ 45 connector from either CAN Link connector 45 on the back panel of any preamplifier chassis 1 to either CAN Link connector on any other preamplifier chassis The two preamplifier channels that are connected are now linked 2 Repeat Step 1 for each addi...

Page 33: ...amplifier chassis front panel or the pwr key 3 on the remote control The blue backlights illuminates the red stand by LEDs 4 turn off and the front panel displays read INITIALIZING The front panel displays shows the factory default input S 1 and level INF The Evolution Two is now in the operational mode 2 With the Evolution Two preamplifier output muted or the volume fully attenuat ed select a sou...

Page 34: ...n Two from stand by to the operational mode 2 Press the input selection button on the preamplifier chassis front panel or the input selection keys 8 9 10 or 11 on the remote control to select the source that you want to listen to through the main outputs 3 Begin playing the source Use the level control knob on preamplifier chassis front panel or the level keys 16 on the remote control to adjust th...

Page 35: ...ance phase record and mute adjustments you make on any preamplifier channel are instantly transmitted between all linked preamplifier channels 2 All configuration settings may be copied from any linked preamplifier channel to all other linked preamplifier channels using the clone feature See Clone on page 35 For more information on linked preamplifiers see Appendix CAN Link and Multiple Evolution ...

Page 36: ...utton on the preamplifier chassis front panel or the menu key on the remote control Once you are in the menu you can press the menu button or key to exit the menu 16 Volume Knob or Level Keys Use the volume knob on the preamplifier chassis front panel or the up and down keys on the remote control to scroll forward and backward through the menu hier archy Each menu list is a continuous loop 18 Ente...

Page 37: ...confirm the selection The front panel display reads AC MAINS OFF The Evolution Two switches to stand by mode when it detects AC power ON The Evolution Two turns on immediately bypassing the stand by mode when it detects AC power Backlight This function enables you to control the blue power indicator brightness The options are OFF LOW 25 MED 50 HIGH 100 Enter the menu then 1 Use the level control k...

Page 38: ...page 51 Channel Assign This function enables you to override the factory set channel assignments The options are FORCE LEFT FORCE RIGHT FORCE NONE NO OVERRIDE Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select CHANNEL ASSIGN 2 Press the enter button on the preamplifier chassis front panel or the enter key ...

Page 39: ...tify the clone transmitter and clone receiver The clone transmitter is the preamplifier channel that transmits the clone and the clone receiver s is are the preamplifier channel s that receive s the clone 2 Use the level control knob on the preamplifier chassis front panel 1 of the clone transmitter or the up and down keys 16 on the remote control to select CLONE 3 Press the enter button on the pr...

Page 40: ... on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 reads MODE 3 Press the enter button or key 18 again The front panel display shows the default mode ON 4 Use the level control knob or the up and down keys to select the desired option ON or TIMED 5 Press the enter button or key to confirm the selection The front panel display reads MODE 6 ...

Page 41: ...mplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 show the software ver sion number 3 Rotate the level control knob clockwise or press the up key The front panel display shows the EEPROM version number 4 Rotate the level control knob clockwise or press the up key again The front panel display shows the PC board version number 5 Press the enter button...

Page 42: ...ol knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select INPUT NAME 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode B 1 3 Use the level control knob or the up and down keys to select the desired input B 1 B 2 B 3 S 1 S 2 S 3 S 4 C 1 C 2 C 3 or T...

Page 43: ...nput NORMAL The phase of the selected input is unaffected INVERT The phase of the selected input is inverted 180 degrees Input Trigger This function enables you to configure the input trigger The options are OFF NORMAL THEATER Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or the up and down keys on the remote control to select INPUT TRIGGER 2 Press the en...

Page 44: ...ist 4 Press the enter button or key to send the command out via the preamplifier front panel IR transmitter 7 The stand by LED 4 on the preamplifier chassis flashes indicating that the command has been sent 5 Repeat Steps 2 4 for each of the commands you wish to transmit 6 Press the enter button or key to confirm the selection The front panel display reads IR OUT For a listing of IR codes see the ...

Page 45: ... the enter button or key to confirm the selection The front panel reads LINKED LINKED When preamplifier channels are linked power volume balance phase record mute and input selections are automatically communicated between linked pre amplifier channels All other settings remain local and may be cloned from one preamplifier channel to another See also Clone on page 35 and Software Clone on page 45 ...

Page 46: ... of up to 20 seconds The options are ON OFF DELAY Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select OUTPUT TRIGGER 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode TRIGGER 1 3 Press the enter button...

Page 47: ...s are LINK TRANSMIT LINK RECEIVE Enter the menu then 1 Use the level control knob on the preamplifier chassis front panel or up and down keys 16 on the remote control to select RC 5 CONTROL 2 Press the enter button on the preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode LINK TRANSMIT 3 Use the level control knob or the up ...

Page 48: ...ne settings All settings revert to the last settings in memory prior to cloning See also Clone on page 35 RS 232 Control This function enables you to change the link transmit status of the Evolution Two The options are LINK TRANSMIT LINK RECEIVE Enter the menu then 1 Use the level control knob on the preamplifier channel front panel or up and down keys 16 on the remote control to select RS 232 CON...

Page 49: ...play 15 shows the default mode GO 3 Press the enter button or key to save the settings The front panel display reads SAVE GO Saves a copy of current settings to memory overwriting previously saved settings Software Clone This function enables you to transfer operational software from one linked pream plifier channel to another Software clone insures that where desired software for multiple preampl...

Page 50: ...pe input The input that is not selected operates as a normal input The options are B 3 S 4 NONE Enter the menu then 1 Use the level control knob on the preamplifier channel front panel or up and down keys 16 on the remote control to select TAPE INPUT 2 Press the enter button on the preamplifier channel front panel or the enter key 18 on the remote control The front panel display 15 shows the defau...

Page 51: ...el display 15 shows the default input B 1 3 Use the level control knob or the up and down keys to select the desired input B 1 B 2 B 3 S 1 S 2 S 3 S 4 C 1 C 2 C 3 or TAPE 4 Press the enter button or key The front panel display shows the default mode OFF 5 Use the level control knob or the up or down keys to select ON or OFF 6 Press ENTER to confirm the selection and return to the selected input ON...

Page 52: ...he preamplifier chassis front panel or the enter key 18 on the remote control The front panel display 15 shows the default mode dB 3 Use the level control knob or the up and down keys to select the desired option NUMERIC or DB 4 Press the enter button or key to confirm the selection The front panel display reads VOLUME DISPLAY 17 Menu Button or Key Enter or exit the menu 16 Volume Knob or Level Ke...

Page 53: ...re Clone on page 45 Q When I adjust the balance the sound moves to the side that is opposite my adjustment What is wrong A The Evolution Two preamplifier is preset from the factory as either a left or a right preamplifier Make sure the preamplifier chassis with the white connectors is used for the left channel and the preamplifier chassis with red connectors is used for the right channel Q What sh...

Page 54: ...er channel off remove the interconnect cables the turn the preamplifier channel on If the hum disappears turn the preamplifier channel off and reinsert one of the interconnect cables Turn the preamplifier channel back on Repeat this process for each cable 3 If the hum reappears with one or both interconnect cables reinserted the cable needs to be replaced 4 If the interconnect cables are sound you...

Page 55: ... of the Evolution Two using a third party remote control system via the infrared IR transmitter 7 and the RC 5 42 and RS 232 43 connectors 3 The use of the balance and channel assign functions via the menu button or key 17 CAN Link logic is transparent during the normal operation of a stereo pair of linked Evolution Two preamplifiers To Connect Multiple Evolution Two Preamplifiers via CAN Link Aft...

Page 56: ...am plifiers is referred to as right terminated There is only one RG 45 link cable con nected to a right terminated preamplifier channel Example The illustration below shows the preamplifier chassis back panels of three linked preamplifier channels There are two right R channels and one left L channel In this configuration the top chassis belongs to a right terminated pre amplifier channel IR RC5 a...

Page 57: ... period must be presented to obtain warranty service The warranty begins on the date of the original retail purchase as noted on the bill of sale or receipted invoice from an authorized Krell dealer or distributor Previously owned equipment when re purchased from an authorized Krell dealer or distributor has the balance of the original warranty based on the original date of manufacture The warrant...

Page 58: ... damaged by acci dent 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 unit will void the warranty In the event that Krell receives a product for warranty service that has been modi fied in any way without Krell authorization all warranties on...

Page 59: ...s 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 the product received by Krell was box...

Page 60: ...hms Balanced 40 k Ohms Single ended 20 k Ohms Output impedance CAST 1 M Ohms Balanced 250 Ohms Single ended 125 Ohms Gain 12 dB CAST or balanced output 6 dB single ended output 56 Volume control Balanced current mode 16 bit discrete R 2R ladder Input overload CAST 11 mA RMS Balanced 9 V RMS Single ended 18 V RMS Output overload CAST 22 mA RMS Balanced 20 V RMS Single ended 10 V RMS Frequency respo...

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