Audio Research SP20 Manuale utente

User Guide

H I G H D E F I N I T I O N ®

SP20

Stereo Preamplifier

2Contents

Preface 3

Illustrations 4

Warnings 5

Installation

Installation of Vacuum Tubes 6

In Your System 7

Connections 8

Operation

Power-Up Procedure 9

Front Panel Controls 10

Remote Control Only Controls 11

Interactive Touch Screen Operation 12 - 17

Troubleshooting 18

Maintenance

Servicing 19

Cleaning 19

Disposal and Recycling Guidelines 19

Limited Warranty 20

Specications 21

Thank you for selecting the SP20 as part of your music

listening system. The engineers and designers at Audio

Research have spent countless hours of listening and

testing to create a preamplier of the highest caliber for

music reproduction. The SP20 has been designed to

provide you many years of playback.

Please take a few minutes to read through this guide

to help you better understand and optimize your new

preamplier. If you have any questions regarding the

operational functions, contact your dealer or distributor

for assistance.

Sit back and enjoy your new preamplier and the

enhancements it will bring to your system. The SP20 will

bring new life to your entire music collection.

Happy listening!

Preface

Front Panel

VOLUME

POWER MUTE

SOURCE

PHONES

SP20 VACUUM TUBE STEREO PREAMPLIFIER HIGH DEFINITION ®SPKR OFF

WARNING

TO PREVENT FIRE AND SHOCK HAZARD, DO NOT

EXPOSE THIS DEVICE TO RAIN OR MOISTURE.

UNIT MUST BE OPERATED IN A HORIZONTAL POSITION.

-DO NOT OPERATE WITH COVERS REMOVED-

UNIT CONTAINS VOLTAGES WHICH MAY BE HAZARDOUS.

+12V REMOTE

TRIGGER

(30mA max)

VOLTS

SERIAL

RS-232

IR INPUT

30W MAX

50/60HZ

CAUTION

FOR CONTINUED PROTECTION AGAINST

FIRE HAZARD REPLACE FUSE ONLY

WITH SAME TYPE AND RATING

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION

STEREO PREAMPLIFIER

PLYMOUTH, MINNESOTA

MADE IN U.S.A.

MODEL SP20

GROUND

SE1PHONO

1.5 A FUSE

SLO-BLO

T630MA

(230V)

SE3SE2 MAIN 2 MAIN 3

RECORD MAIN 1

LEFT INPUTS

RIGHT INPUTS

LEFT OUTPUTS

RIGHT OUTPUTS

SE4 BAL1 BAL2

MONITOR

Illustrations

Back Panel

Remote

MONO

SP20

LOAD SPKR OFF

POWER

BAL L BAL R

MUTE

HOURS

PHONO

SE1 SE2

SE4 BAL1 BAL2

VOL DN VOL UP

SE3

DSP DN

INVERT

DSP UPMON

H I G H D E F I N I T I O N ®

Warnings

To prevent re, or shock hazard, do not expose your SP20 to rain or

moisture. Do not place containers with liquid on top of unit.

This unit contains voltages which can cause serious injury or death. Do

not operate with cover removed. Refer servicing to your authorized Audio

Research dealer or other qualied personnel.

The detachable power cord on your SP20 is equipped with a heavy gauge,

3-conductor cable and a standard three-prong grounding plug. For

absolute protection, do not defeat the ground power plug. This provides

power line grounding of the SP20 chassis to provide absolute protection

from electrical shock.

For continued protection against re hazard, replace the fuse only with the

same type and rating as specied at the fuse holder.

The appliance coupler at the rear of this unit must be accessible for

emergency power disconnect.

A note about packaging...

Save all packaging in a dry place away from re hazard. Your SP20 preamplier

is a precision electronic instrument and should be properly cartoned any

time shipment is made. You may not have occasion to return your unit to

the factory for service, but if that should prove necessary, or other occasion

requiring shipment occurs, the original packaging will protect your SP20

from unnecessary damage or delay.

6Installation

Installation of Vacuum Tubes

Before operating the SP20...

This unit has been shipped with the vacuum tubes installed in protective

foam in a separate box packed inside the shipping carton. Remove the

tubes carefully from the protective foam. Using a phillips-head screwdriver

to loosen the fastening screws, remove the top cover and set aside.

After removing the top cover and the vacuum tubes packed in protective

foam, see the accompanying illustrated sheet for instructions on installing

the tubes for your SP20 in their proper locations in the power supply and

audio chassis. Note that the numbers written on each tube correspond to

a ‘V’ number printed on the circuit board next to each tube socket. Insert

each tube rmly, carefully aligning the tube pins with the corresponding

socket holes.

Line

Stage

Phono

Stage

CHANNEL

R L

Installation

In your System

While the SP20 does not dissipate an unusual amount of heat, it is important

that it be provided with reasonable airow to assure long, trouble-free

operation. In addition, the following installation guidelines will help insure

maximum sonic performance as well as reliable service:

Operate unit in upright and horizontal position, preferably on solid, non-

metal shelving.

Do not stack the preamp on top of a power amplier: not only could this

cause overheating, but hum may be introduced into the preamp from the

proximity of the amplier’s power transformer.

Do not stack components or other objects directly on top of the SP20.

Do not place or operate your preamp on a soft or irregular surface such as

a rug. This will prevent proper ventilation.

Do not operate your preamp without the top and bottom covers installed.

These are required both for safety as well as shielding from interference

(except in service operations by qualied personnel).

Ensure a minimum of 8-10” clearance above the unit when placed on

shelving.

8Connections

Analog Connections

Input Connectors: The SP20 provides ve pairs of single-ended input

connectors: SE1 - 4, PHONO and MONITOR. Please note that input SE4

can be selected as a unity gain input; in this case, SE4 should only be

connected to a component with a volume control (such as a home theater

processor). For further information about the SE4 unity gain (PROC mode),

see the section ‘PROC Mode’ on page 16. In addition, there are two pairs

of balanced input connectors: BAL1 and BAL2.

Never connect a source with a xed level output (DVD player, tuner, CD

player, etc.) to the unity gain input. This could cause serious damage to the

ampliers or speakers in your system.

Output Connectors: Two pairs of balanced and one pair of single-ended

main outputs are provided.

Record Output: The tape outputs should be connected to your recorder’s

‘Record’ or ‘Line’ inputs. These outputs provide a xed-level two-channel

signal (L, R) to your recorder from whichever input is selected. The xed

output level will be the same as the output of the selected source.

It is possible to dub or copy from one recorder to another by connecting the

output of the source recorder to an unused set of stereo inputs (e.g. SE2 or

BAL1). The signal will then be routed to the Record Out connectors when

that input source is selected.

RS-232 Connection: The RS-232 connection allows for remote control via

systems such as Creston or other automation systems.

IR Input: The IR input can be used to link the SP20 to an IR repeater

system with a standard mono 1/8” connector.

12V Trigger Jack: The +12V DC output connector provides the ability to

remotely turn on and off other linked components such as power ampliers

having similar capabilities.

Operation

Power-Up Procedure

• Secure all rear-panel connections between SP20, power amplier(s) and

input sources.

• Plug three-prong power cord from rear of chassis into grounded A.C. wall

outlet. The Power switch defaults to ’off’ when the unit is plugged into a

power receptacle.

• Press power switch (either on the remote or front panel). The screen will

begin the warm-up sequence, rst displaying the Audio Research logo,

followed by SP20 and a series of dots (g. 1 + 2). The home screen will

then appear, and the unit will be muted. Depress the front panel MUTE

button (right button) or the Mute button on the remote to initiate normal

operation.

• Select input source and adjust the volume as necessary.

Shut-Down

• Activate ‘Mute’ function.

• Set Volume level to 0.

• Turn off power amplier(s).

• Press Power switch to ‘off’.

• Turn off input sources.

g. 1 g. 2

10 Operation

Front Panel Controls

The SP20 has two microprocessor-driven rotary controls and three buttons

(Power, Mute and Speaker Off).

Left Rotary control (Input Select): Select input by rotating the control to

the left or right. The screen displays the current input by factory-set and

user-denable name at the top right.

Right Rotary control (Volume): Adjust volume (output level) up or down for

both L and R channels. Volume control is also selectable via Vol UP and Vol

DN buttons on the remote control. Volume adjustment is indicated in the

display window by numeric digits on 0–103 scale.

Do not turn volume up beyond normal listening levels when ‘mute’ is

engaged to avoid unexpected or possibly damaging sound levels. Reduce

volume level whenever changing input sources, even when muted.

Power On/Off: Supplies power from A.C. wall outlet to preamp; indicated

by active display window. The SP20 requires approximately 30 seconds to

warm up; this time is required to stabilize the power supply. See ‘Power-Up

Procedure’ on the adjacent page for details.

Mute: When activated, electrically mutes all output of the preamplier;

indicated by ‘Mute’ in display window. This control should be activated

before switching inputs, changing connections or shutting down your audio

system to help protect your amplier and speakers from unexpected signal

pulses. When deactivated, ‘Mute’ disappears from the display window

allowing normal operation.

The SP20 also has automatic muting to help protect system components

in the event of low line voltage. When sensing low line voltage, the preamp

displays ‘Low Line’ and automatically goes into ‘Mute’. This condition will

persist until the line voltage returns to a safe operating level; please note the

unit will remain in ‘Mute’ even after ‘Low Line’ no longer appears.

Note that automatic muting is only designed to protect against power line

interruptions or severe voltage drop. It will not mute in the event of subsonic

transmissions from a faulty input source, amplier failure or speaker

malfunction.

Spkr Off: Toggles between the main outputs on the back of the unit and the

headphone jack mounted adjacent to the Speaker Off button.

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