Pioneer SA-9800 Manuale di istruzioni per l'uso - Pagina 10

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Pioneer SA-9800 Manuale di istruzioni per l'uso

a} TONE SWITCH

Set this switch to ON when adjusting the bass and

treble

controls.

When

set

OFF,

the

tone

control

circuits

are

disengaged

and

frequency

response

is flat. This function is convenient for

checking

phono

cartridge

and

speaker

tone

quality and listening room acoustics.

@@ TREBLE TURNOVER

SWITCH

Use this switch to change over the frequency in

which

the

sound

adjustment

with

the

treble

control is starting to take effect. Select 2.5kHz or

5kHz

in accordance

with the characteristics of

your listening room

and of your speakers, and

with your general preference.

49 BALANCE CONTROL

Use this control to balance the volume of the left

and right channels. First, however, set the mode

selector to mono

(L+R,

L, or R), and adjust so

that the sound appears to come from somewhere

exactly between the two speakers. If the sound

appears to be louder on the right, it means that

the volume of the right channel is higher. Turn

the balance control to the left and adjust.

Conversely, if the sound appears to be louder on

the

left, it means

that the volume

of the left

channel

is higher. Therefore,

turn the balance

control to the right and adjust. After adjusting,

return the mode selector to STEREO.

2@ LOUDNESS SWITCH

When

listening to a performance with the volume

control turned down,

set this switch to ON

and

the bass and treble will be accentuated.

When

the volume

is low, the human ear finds it

harder to hear the bass and treble than when the

volume

is high.

The

loudness

switch

is thus

designed

to compensate

for this deficiency. By

setting it to ON, the bass and treble come through

much

strongly

and

the sound

takes on a

punch even when

the volume control is turned

down.

2?) MUTING SWITCH

Set this switch to —20dB to attenuate the audio

output indicated by the volume control by 20dB.

There is no need to adjust the volume control if

you use this switch when turning down the audio

output

temporarily

and

when

changing

over

records or tapes.

STEREO:

Set to this position for normal stereo

reproduction.

L+R: Mixes

left and

right channel signals and

reproduces them monophonically.

Left channels signal is reproduced mono-

phonically from._both speakers,

Right channel signal is reproduced mono-

phonically from both speakers.

CARTRIDGE

LOAD SELECTORS

{ohms and pF)

These selectors allow you

to select the input

resistance and input capacitance in line with the

rated load impedance and load capacitance of a

moving magnet (MM) cartridge for record play.

Use

these

two

switches

to produce

the sound

quality of your preference or the ideal conditions

for your cartridge.

TURNOVER

SWITCHES

prnamcey

This amplifier adopts a tone control system that

combined

bass

and

treble

controls

with

two

turnover

switches

which

are used

to select the

frequency. Select the frequency with the turnover

switches and then enhance or attenuate the sound

in the lower (or higher) frequencies with the bass

(or treble) controls.

For instance, if the bass turnover switch is set to

400Hz

(see Fig. 7), the bass covers a wide with

large gain per step of the bass control. For this

reason,

the

reproduced

sound

sometimes

seems

unnatural

depending on the program source, but

this can

be remedied

by setting

the switch to

200Hz.