Conrad-Johnson Premier 18LS Manuel utilisateur

Thank you for selecting the Conrad-Johnson Premier 18LS line stage

preamplifier as the control center for your audio system. Our first solid-

state component in the Premier range, the Premier 18LS is capable of

remarkably faithful recreation of the dynamics, textures, tonalities, and

ambienceoflivemusicalperformances.Usingit,webelievethatyouwill

experience the excitement of discovery in hearing more from your

favorite recordings than ever before.

Atconrad-johnson,weexpectour productstobe asourceof 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 the Premier 18LS has been designed to operate in an intui-

tively apparent way, you will find useful information on it’s installation

and operation in this manual. Please take a few minutes to read the

manual to better understand the features and capabilities of your Pre-

mier18LS.Notethatthisunitis phaseinverting.See the section entitled

"Getting The Most From Your Premier 18LS" for details on correct

hookup in your system.

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 Premier 18LS, and

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

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

Premier 18LS 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

period of three years from the date of purchase by the original pur-

chaser, 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 excep-

tion 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

insurance prepaid by the owner. After repair, the unit will be returned

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

destination in the United States.

All implied warranties, including merchantability and fitness for a par-

ticular 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.

Premier 18LS Owner’s Manual 2

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

United States, but in these cases, 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 conrad-johnson service department can also be reached by email

at [email protected], 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-

tained from our service department for a nominal charge, if you no

longer 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 awarethatrequestinganestimate willdelayservice toyour 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

Premier 18LS Owner’s Manual 3

Installation

All Premier 18LS preamplifiers sold in the United States are configured

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

volts. Export versions of the Premier 18LS will have the correct operat-

ing 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 Premier 18LS to

minimize it’s susceptibility to radio frequency interference and other

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

andpowersupplydesign have all been specified with a viewtoreducing

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

theexpenseofdegraded 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.

CareininstallationcanoftenavoidEMIinducedproblems.Thefollowing

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).

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

minimizing 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.

Premier 18LS Owner’s Manual 4

Connection

SOURCES (PH/AUX1, TUNER, CD, VIDEO, AUX2): These high level

inputs are electrically equivalent. The load they present to the source

varies with the volume control setting, but in no case will it drop below

12 kohms. Connect the corresponding source components to these

inputs.

EXTERNAL PROCESSOR LOOP (EPL1): A set of line-level inputs and

outputs provided for connection of external signal processors (e.g.

parametric equalizer, tone controls). These can also be used for the

connection of a tape recorder. In this case, connect the EPL OUT to the

recording input of your tape recorder, and the EPL IN to the output of

your tape recorder. The EPL IN connection can also be used as an

additional line level input.

THTR/EPL2: This is an external processor loop designed to conven-

iently accommodate the addition of a surround-sound processor (SSP)

to a high-quality two channel system without compromising two channel

performance. Connect the front left and front right channel outputs from

your SSP to the THTR/EPL2 input. You can also connect the

THTR2/EPL2 OUT to an input on your SSP, allowing you to do matrix

processing on selected two channel sources. When this THTR loop is

selected, the level controls are set to unity gain. Level and balance

control is then accomplished via your surround sound processor.

MAIN OUT1 and MAIN OUT2: Connect to the input of your amplifier (or

crossover in a bi-amplified system). We recommend the use of an

amplifier with an input impedance of 20k ohms or higher. Since the

Premier 18LS inverts phase, it may be necessary to invert the speaker

leads to maintain correct absolute phase. See the section on "Getting

the most out of your Premier 18LS" for an explanation.

Premier 18LS Owner’s Manual 5

Controls

standby: Instandby mode,thedisplay ofthePremier 18LSwillbe blank

and the output muted. The standby led will be lit to indicate standby

mode. Pressing the mute, button on either the remote control or the

front panel will return the unit to normal operation at the previously

assigned level settings and the previously selected input. Pressing the

mute button and holding for two seconds will switch the unit to standby

mode. When first connected to ac mains, or after an interruption of

power, the Premier 18LS will turn on in a default standby mode, with the

level set at 20, and the CD input selected.

source (phono/aux1, tuner, cd, video, aux2): Pressing the button

labeled source will cause the unit to step through these five inputs, in

the order displayed on the front panel. The selected input will be

indicated by an illuminated led.

epl: Pressing the epl button will toggle the unit between the epl input

and a selected source. When source is selected, the input selected as

source will be passed directly to the volume control. When EPL is

selected, the selected source will first pass through the external proces-

sor loop before being routed to the volume control.

theater: Pressing the theater button will toggle the unit between the

theater input and a selected source. When source is selected, the input

selected as source will be passed directly to the volume control. When

THEATER is selected, the selected source will first pass through the

THEATER loop before being routed to the volume control and the level

for both channels will be set and locked to unity gain.

level dn, level up: Level setting on the Premier 18LS is achieved by

using a programmed microprocessor to select combinations from

among an array of high-quality precision resistors. This arrangement

allows 100 steps of approximately .7 dB per step. The steps are num-

bered 0 through 99, with 0 being silence, and 99 being maximum

volume.

The level setting can be changed by pressing the vol dn and vol up

buttons on the front panel. Each time a button is pressed, the level will

move up or down one step. If a button is pressed and held, the level

Premier 18LS Owner’s Manual 6

control will cycle through the steps at an accelerating rate. Balance can

only be set via the remote control.

mute: Pressingthe mutebuttonwillcausethe mainoutputsto muteand

the level display to be zero. Pressing it again will restore the last level

setting. Pressing and holding the mute button for more than three

seconds will switch the Premier 18LS into standby mode. Pressing the

mute button when the unit is in standby mode will switch it back to

operational mode.

Remote Control

All operations of the Premier 18LS can be controlled by the hand-held

wireless remote unit.

MUTE: duplicates the function of the front panel mute button.

PH/AUX,TUNER, CD,VIDEO, AUX2: Youcandirectlyaccess anyinput

by pressing the associated button on the remote.

EPL1, EPL2: Pressing the EPL buttons will insert the associated exter-

nal processor in the signal path. Pressing the button again will re-estab-

lish a direct connection to the selected source. Note that pressing the

EPL2 button selects the THTR/EPL2 input, setting the level to unity

gain.

LEVEL - +: Duplicates the function of the front panel vol dn, vol up

controls.

BALANCE: Allows attenuation of either channel independently of the

other.Pressingtherightbalancebuttonwillreducetheleftchannellevel

setting by one step. Pressing and holding the right balance button will

cause the left channel to cycle down through its level settings at an

acceleratingrate. Pressing theleftbalance button willattenuatethe right

channel in the same manner.

Premier 18LS Owner’s Manual 7

Getting The Most From Your Premier 18LS

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

johnson Premier 18LS offers an unparalleled 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

unnatural alternative of a negative transient (an initial fall in air pres-

sure). 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 Premier 18LS is phase inverting. If your system has an odd number

of inversions, (for example, if the Premier 18LS is the only phase

inverting unit in the chain) 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

more sharply defined. The effect is especially apparent on plucked

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.

Premier 18LS Owner’s Manual 8

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.

Performance Tip

Warm up the Premier 18LS before listening: The sonic performance of

the Premier 18LS improves noticeably as the unit warms up. The

midrangebecomesmore lucid, thehighssmoother,and the soundstage

expands. The warm up period can be expected to last about fifteen

minutes.

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

your Premier 18LS do not hesitate to call Customer Service at (703)

698-8581.

Premier 18LS Owner’s Manual 9

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