Conrad-Johnson MF2100 Manuel utilisateur

Conrad-Johnson Owner’s Manual:

MF2100, MF2200, MF2300 Amplifiers

conrad-johnson It just sounds right.

Thank you for selecting one of the MF2000 series amplifiers (the

MF2100, MF2200, and MF2300) to power your audio system. These

amplifiers draw on two decades of research at conrad-johnson into the

reproduction of recorded music. The result is a power amplifier with a

remarkable ability to recreate the the dynamics, textures, tonalities, and

ambience of live musical performances. With your new MF2000 series

amplifier,webelievethatyouwillexperiencetheexcitementofdiscovery

in hearing more from your favorite recordings than ever before.

At conrad-johnson, we expect our products to be a source of satisfaction

and of pride to their owners for many years to come. Accordingly, circuit

designs, parts and materials for all conrad-johnson products are se-

lected with a view to maintaining optimal performance over the years.

Our reputation for producing among the industry’s most reliable compo-

nents is a natural consequence of this engineering approach.

Although operation of these amplifiers is quite straightforward, please

take a few minutes to read this manual for useful information on instal-

lation and operation.

In closing, we’d like to welcome you to the family of conrad-johnson

owners. We want you to enjoy your conrad-johnson product to the

fullest. To this end, our staff stands ready to answer any questions you

may have about the function and application of your MF2000 series

amplifier, and to provide any needed service both during, and after the

warranty period. Our goal is to heighten your enjoyment of recorded

music.

MF2000 Series Owner’s Manual 1

Limited Warranty For Conrad-Johnson Components

conrad-johnson design, inc. will provide service under warranty to the

original owner on products sold new in the United States for the lesser

periodofthreeyears fromthedateof purchasebytheoriginal purchaser,

or five years from the date of shipment to the authorized conrad-johnson

dealer. During the warranty period, conrad-johnson will repair defective

units without charge for labor or parts (with the exception of vacuum

tubes and batteries).

Exclusions. The following are not covered under this warranty:

a) Units which have been damaged by misuse, abuse, or accident.

b) Units which have been modified, altered, or improperly repaired by

anyone not specifically authorized by conrad-johnson design, inc.

c) Units not purchased from an authorized conrad-johnson dealer in the

United States for use in the United States.

d) Normal wear.

e) Incidental or consequential damages are not covered under this

warranty. Some states do not allow the exclusion of incidental or

consequential damages, so this exclusion may not apply to you.

Obtaining Warranty Service:To obtain warranty service, the unit must

be shipped, along with evidence of purchase, in factory packing to

conrad-johnson design (or designated service center) with freight and

insuranceprepaidbytheowner.Afterrepair,theunit willbereturnedwith

freight and insurance prepaid by conrad-johnson design to any destina-

tion in the United States.

Allimpliedwarranties,including merchantabilityandfitnessfor aparticu-

lar purpose are limited in duration to the duration of this express

warranty. Some states do not allow limitations on the duration of implied

warranties so the above limitations may not apply to you.

This warranty gives you specific legal rights and you may also have

other rights which vary from state to state.

Conrad-Johnson products purchased outside the United States are

covered by warranty terms of the importing distributor in the country in

which the product was originally purchased, which may differ from the

terms set out herein. Importing distributors are not obligated to provide

warranty service for products originally purchased outside their country.

Conrad-Johnson will provide warranty service for products outside the

MF2000 Series Owner’s Manual 2

United States, but the customer must pay all shipping, handling and

customs costs both to and from our Service Department.

Questions about this warranty should be addressed to:

Service Department

conrad-johnson design, inc.

2733 Merrilee Drive

Fairfax, VA 22031

The Service Department can also be reached by phone at 703-698-

8581, or by fax at 703-560-5360

Service

If your conrad-johnson audio component requires service, repack it

using the original box and packing material and ship to the Service

Department address above. Boxes and packing materials can be ob-

tainedfrom our service departmentfor a nominalcharge if you nolonger

have yours. Include with the unit a note describing the problem you are

having in as much detail as possible. It is especially important for our

technician to know if the problem is intermittent. If you want an estimate

of cost for out of warranty service, be sure to request it in this note. Be

aware that requesting an estimate will delay service to your unit as we

will have to contact you for your approval before commencing service.

Registering The Warranty

Please return the enclosed card to the factory within 30 days of pur-

chase to register the warranty.

MF2000 Series Owner’s Manual 3

Installation

As is the case with any high-power amplifier, the MF2000 series ampli-

fiers dissipate a significant amount of heat. Provision must be made for

adequate ventilation. Mount the unit on a flat, hard surface, taking care

that the ventilation holes in the bottom are unobstructed. Maintain at

least four inches of clearance above the unit, and at least three inches

on the sides. The cabinet or shelf should be open at both front and back.

For more restricted installations, cooling fans are essential.

All MF2000 series amplifiers sold in the United States are configured for

operation on a 60Hz ac power line producing between 108 and 126

volts. Export versions of these amplifiers will have the correct operating

voltage and frequency clearly marked on the back panel of the unit, near

the ac power cord. In all cases, the actual line voltage should be within

+ 5/- 10% of the nominal rated voltage.

Electromagnetic Interference (EMI)

Considerable care has been taken in the design of the MF2000 series

to minimize susceptibility to radio frequency interference and other

forms of EMI. Choice of materials, physical layout, grounding practice,

and power supply design have all been specified with a view to reducing

the impact of electromagnetic fields on the performance of this unit. At

the same time, however, our primary goal is the accurate reproduction

of recorded music in the normal home environment, and we have

elected not to compromise this objective by the application of heavy-

handed RFI filters, or by using grounding practices that reduce RFI at

the expense of degraded audio performance. We find that the approach

we have taken has worked extremely well, resulting in only rare in-

stances of EMI problems which could be treated locally as needed,

rather than compromising the performance of our product in the 99.9%

of installations where EMI is not a problem.

Careininstallationcanoften avoidEMIinducedproblems.The following

practices should generally be observed in any application, and will be

especially important where EMI may be a problem.

Interconnect cables should be kept as short as possible (3 meters or

less), and shielded cable should be used (cable which has two center

conductors, and a separate external shield connected at only one end).

MF2000 Series Owner’s Manual 4

Physical location and cable "dress" can be an important factor in mini-

mizing hum pickup. The installation should situate the preamplifier well

away from the power amplifier, and power (ac mains) cords should be

dressed to remain at least 4" (100mm) away from input/output cables.

Connection

INPUT: Connect the preamplifier to your amplifier at the RCA type

connectors located on the back of the amplifier.

OUTPUT: Five way binding posts are provided for connection of your

loudspeakers, with correct spacing to accept a standard "double ba-

nana" plug. They will also accept spade lugs, bare wire, or pin connec-

tors. The two channels should be connected in correct "relative phase".

This means that when the same signal is applied to both channels, the

right and left channels speaker diaphragms will move synchronously -

in and out together.

Terminals on speakers are usually coded - one designated "C",

"ground", "-" or black, the other designated "+" or red. "In phase"

connection of the speakers can normally be achieved by taking care to

connect the wire from the "+" amplifier terminal to the red or "+" coded

terminal on each speaker, and connecting the "-" terminal to the black

or "-" coded terminal on each speaker.

In phase connection of the speakers can be readily ascertained by ear.

Listen to a recording of a solo vocalist (use a mono recording if avail-

able). With the speakers in phase the voice should be clearly focused

between the two speakers. With the speakers connected out of phase,

thevoicewillbediffused,withnoidentifiablesource.Relativephasemay

be reversed by switching the "+" and "-" leads at one speaker only.

MF2000 Series Owner’s Manual 5

Getting The Most From Your Amplifier

In a system of commensurate high quality components, these conrad-

johnson amplifiers offer a high level of sophistication and refinement in

music reproduction. To get the best performance out of any audio

system, there are a number of important details which must be attended

to.

Absolute Phase

Musical notes are heard through the ear’s response to waves of alter-

nating rise and fall of air pressure. Musical transients are almost exclu-

sively positive: that is, the initial effect is a rise in pressure. The ear is

capable of distinguishing these positive transients from the musically

unnaturalalternative ofa negativetransient (aninitial fallin air pressure).

In terms of your stereo system, these transients are created by your

loudspeakers. If the speakers respond to musical transients by first

moving out, they are creating a rise in pressure, and the system is said

to be phase correct. If they respond by moving in, they create a fall in

pressure and the system is said to be phase inverting. Each component

in the stereo system either preserves the phase of the incoming signal,

and is said to be phase correct, or inverts the phase and is said to be

phase inverting. It is unimportant whether an individual component is

phase correct or phase inverting, as long as the system as a whole is

phase correct. This will be the case if the number of phase inversions is

even (or zero).

The MF2000 amplifiers are phase correct. If your system has an odd

number of inversions, then you must add one phase inversion. This is

conveniently done by reversing the positive and negative connections to

your speakers (be sure to reverse both channels).

If you are not sure about the phase of every piece in your system, you

can establish correct absolute phase by careful listening. When the

system is in correct phase, transients will be noticeably cleaner and

moresharplydefined.Theeffect isespeciallyapparentonplucked string

sounds. A final warning - not all recordings are phase correct (including

some "audiophile" recordings), so listen to several before concluding

your investigation of absolute phase.

MF2000 Series Owner’s Manual 6

The Importance Of Wires

Interconnect and speaker wires are an important element in your stereo

system. Interconnects are available which will permit a reference quality

system to blossom and fulfill its promise of musical reality. Others will

strangle the system to the point where it becomes little better than

average. To complicate matters, our experience suggests that the

choice of interconnects will be system dependent - those that are top

ranked on one system may be a poor choice for a different system.

Consult your conrad-johnson dealer for recommendations for your spe-

cific system.

Questions: If you have questions about the installation or function of

your amplifier do not hesitate to call Customer Service at (703) 698-

8581.

MF2000 Series Owner’s Manual 7

Specifications:

Power: 240 watts per channel RMS (MF2300), 200 watts per channel

RMS (MF2200) and 100 watts per channel RMS (MF2100) both chan-

nels driven into 8 ohms from 20Hz to 20KHz at no more than 1% total

harmonic distortion or intermodulation distortion.

Sensitivity: MF2200 & MF2300 2.0 V to rated power.

MF2100 1.6 V

Phase: Phase correct (non-inverting)

Frequency response: 20Hz to 20KHz +0, -.25dB

Hum and noise: 98dB below full power output.

Input impedance: 100K ohms.

Dimensions: MF2300 16.875D x 19W x 6.75H inches

MF2200 16.875D x 19W x 5.20H inches

MF2100 13.875D x 19W x 4.31H inches

Weight: MF2300 57 lbs., MF2200 47 lbs., MF2100 28 lbs.

Fuses: There are 5 fuses in the MF2000 Series Amplifiers. One is the

ac power line (mains) fuse. It is located in a fuse holder near the power

cable. The other four fuses are in the main DC power supplies. On the

MF2200 and MF2300, these are located in fuse holders near the output

jacks, labeled B+ and B-. On the MF2100, these DC power supply fuses

are inside the chassis on the printed circuit board.Never replace a fuse

with a value or type different from that originally supplied by the

factory. Correct values and types are listed below. In the event of a fuse

blowing repeatedly, contact your dealer or the conrad-johnson service

department.

100/120 V mains (220/240 V mains) B+/B-

MF2100 5 amp, slo-blo (3 amp, slo-blo) 4 amp fast-blo

MF2200 10 amp, slo-blo (7 amp, slo-blo) 5 amp fast-blo

MF2300 10 amp, slo-blo (7 amp, slo-blo) 6 amp fast-blo

MF2000 Series Owner’s Manual 8

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