Boulder 160 Bedienungsanleitung

-------

BOULDER

160

O'W'.ER

AMPLIFIER

Installation

Instructions

11/14/83

Congratulations

your

choice

the

Boulder

160

Power

Amplifier

order

realize

the

full

sonic

potential

this

amplifier,

ask

that

you

take

few

minutes

read

these

instructions

The

Boulder

160

two

stage

amplifier

with

the

first

being

differential

input

JE-990

operational

amplifier

circuit

having

voltage

gain.

This

allows

the

second

stage

operate

only

gain.

Level

controls

(on

most

models)

are

provided

between

the

stages

allow

checking

the

input

signal

when

first

connected

patched.

The

optimum

setting

the

level

controls

the

"0"

(full

clockwise)

position.

This

ensures

that

the

first

stage

will

not

nea.r

its

Clipping

point.

necessary,

-3

attenuation

may

used

without

risking

audible

clipping

Furthur

attenuation

should

only

used

for

reduced

output

level

situations

such

muting.

The

clip

lights

not

indicate

first-stage

Clipping

The

clip

lights

will

start

illuminate

somewhat

<1-6

dB)

before

actual

clipping

occurs

depending

the

particular

loudspeakers

used.

Therefore,

the

phono

jack

will

produce

positive-going

transition

the

"+"

(red)

output

terminal.

For

mono

operation,

push

the

rear

panel

switch

that

stays

the

"in"

pOSition.

Only

signals

into

the

left

input

are

used

mono.

The

left

channel

red

output

terminal

now

"+",

and

the

right

channel

red

output

terminal

now

"-".

Note

the

markings

the

rear

panel.

Because

current-limiting

protection

circuits,

not

recommended

dnve

a 4

Ohm

(or

less)

load

mono

operation.

furthur

headroom.

will

a.vailable

mono

operation

(as

compared

stereo)

into

Ohms.

Also,

the

damping

ratio

halved

mono

operation,

which

may

affect

sonic

qualities.

For

best

sonic

results,

recommend

the

use

low

characteristic

impedance

speaker

cable.

coaxial

type

such

Mogami

#2477

#2513

has

high

distributed

capacitance

giving

impedances

lower

than

ohms.

Care

should

used

when

trying

this

cable

other

amplifiers,

the

distributed

capacitance

may

cause

less

stable

designs

oscillate.

termination

network

.022uF

series

with

ohms

should

used

-the

speaker

terminals

reduce

reflections

the

speaker

cable.

These

values

really

depend

the

speaker

impedance

above

20KHz,

but

most

instances

will

work

well.

The

green

indicator

light

the

circuit

breaker

will

remain

steadily

when

powered

up.

blinking

indication

shows

either

thermal

overload

(which

takes

about

minutes

reset

itself)

1055

mains

power

the

amplifier.

This

latter

indication

will

only

last

about

seconds.

some

occasional

clip

indication

high

levels

allowable.

The

amplifier

shipped

with

the

differential

inputs

disabled,

since

unbalanced

mode

most

often

used.

enable

the

differential

mode,

move

the

jumpers

the

board

from

"UNB"

the

"BAL"

position.

NOTE:

the

unbalanced

Phono

inputs

are

used,

the

input

mode

should

left

unbalanced

setting

the

jumpers

the

"UNB"

pOSition.

Alternately,

unbalancing

may

accomplished

connecting

(10)

the

3-pin

input

connector

(ground).

_________

The

phase

the

amplifier

such

that

positive-going

tranSition

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