Bazooka BT1014 Spécifications télécharger pdf (Page 18)

TROUBLESHOOTINC

Am

I

In

Phase?

If

your

inputs

are

out

of

phase

and

you

turn

the

balance

control

of

your

radio all

the

way

to

one

side,

right

or

left

the

bass

output

from

the

Bazooka®

will

increase.

When

you

bring

the

balance

control

back

to

the

center

position

the

bass

level

will

drop.

This

confirms

that

one

of

your

input

channels

is

wired

out

of

phase

with

the

other.

When

one

of

the

Amplified

Bazooka's High-level

Input

channels

is

out

of

phase electrically

with

the

other

High-level

Input

channel,

your

Bazooka

will

sound

as

if

it

has

little

or

no

output

and

any

output

that

is

produced may sound

distorted.

If

you

suspect

that

your

Bazooka

is

out

of

phase,

use

the

AM

I IN

PHASE

procedure

to

diagnose

and

correct

the

Bazookas'

output,

and

proper

bass

response

will

be

produced.

channels

is

wired

out

of

phase

with

the

other.

To

correct

this

situation,

simply

flip

the

phase switch

on

the

amplified

Bazooka®.

When

the

input

signal

is

in correct

electrical phase,

the

level

of

bass

output

will

be

greatest

when

the

balance

control

of

the

radio

is

set

to

the

center

position.

Do

You

Have

A Phase

Problem?

If

the

bass

response in

your

application

appears

to

be

lower

then

you

expected

or

sounds

muffled

and

or

distorted,

you

may be

experiencing

Phase Cancellation.

Phase

Cancellation

When

two

speakers in

the

same

frequency

range

produce

sound

waves

that

are

inverted

from

one

another

or

180

0

out

of

phase,

the

sound waves

will

cancel each

other

out

to

some degree. This

effect

will

be heard

as

a

drop

in

the

output

level

and/or

a

muffled

or

muddy

quality

in

the

Bass

Response. The source

of

this

Phase

Cancellation can be

at

any

point

in

the

signal

path.

The obvious

cause

of

this

problem

would

be a speaker

connection

that

was

reversed in

polarity,

but

that

is

not

always

the

case.

Sometimes

amplifier

channels

will

shift

phase 180

0

for

no

good

reason,

or

a signal processor

could

have a

setting

for

phase

that

has been

set

incorrectly

or

the

source

material

could

just

be recorded in

error. Also speaker

placement

and

the

acoustics

of

the

listening

environment

can

effect

the

phase. No

matter

what

or

where

the

cause

is

located,

the

solution

is

an easy one.

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