Marantz 5220 Manuel d'utilisateur télécharger pdf (Page 65)

output,

measured below

the noise

level.

It was about

0.08%

from 3

to 10

watts, and

reached

0.6% at

14 watts

output.

The IM distortion

was between

0.1% and 0.2%

between

0.1 and

9

watts

output,

reaching

0.33% at

12

watts.

It

also

rose at

very

low power

levels, achieving

1% at a few

milliwatts

output.

The input sensitivity

for

10 watts

output

was

145 mV

through

the AUX

inputs,

2.1 mV through

the

PHONO

in-

puts, and

4.5

mV through

the mic

in-

put.

The respective

noise

levels

were

-77.5, -76.1,

and -62.5

dB.

The

PHONO

input overloaded

at

50 mV,

an

adequate

figure

for most cartridges.

Microphone

overload

occurred

at

a

very safe

180

mV.

The characteristics

of

the TREBLE

control

were

hinged at

1000 Hz, and

the

BASS

control

had a sliding

turn-

over

frequency

that permitted

effec-

tive compensation

at very

low fre-

quencies with

negligible effect on

the

response at higher

frequencies.

The

LOUDNESS

compensation

boosted

the

low

and high

frequencies

at

low

VOLUME

control

settings.

The RIAA phono equalization

was

accurate

to within

±

1

dB

from 50

to

15,000

Hz, with a slight

low-

frequency

roll -off to -3

dB at

20

Hz. There was

only a

minor

interaction with

cartridge

inductance,

which increased

the

out-

put by

1 to 2 dB

at frequencies

be-

tween

approximately

8000 and

20,000

Hz.

The

FM

tuner

section

had a

usable

sensitivity

in mono of

12.8 dBf,

equiva-

lent

to 2.4

pV. This

is much better

than

the

rated 3.0

-pV sensitivity

specified

by Onkyo.

In

stereo,

the sensitivity

was

determined

essentially

by

the auto-

matic

switching

threshold of

23 dBf

(7.8 µV). the 50 -dB

quieting

sensitivity

z

C/

rc

0

I-

ó 0.2

uE

0

01

K

<

_

05

ú

¢

02

LL

+10

o

-10

-20

ONKYO

TX -220

FM

SECTION

AUDIO

OUTPUT

O

USO VOLT

(TAPE- OUTPUT

JACKS

USABLE

SENSITIVITY

MONO,

12.8dBf(2.4UV)

STERE0:

23d01(7.

B),'V1

NOISE

+

DISTORTION.

60

-70

-80

- 90

0

50dB QUIET

NG

SENSITIV

TY

MONO:

7.5dBf

(4.IVV)

AT

1.25%

THD

STEREO'

4308f

(77. 7PV) AT 0.56%

THO

1

O

20

30

40

50

INPUT

dBf

60

- -- -MONO

- -STEREO

1,

0 80

+I

o

,-. 10

20

° -30

-4

-5

IIIII

ImmliIU!

iIIIii

FREQUENCY RESPONSE II\

ii

(ii

IIIIII

IIIIII

ONKYO

TX-22O

Mill

111111

111111 STEREO FM

IIIIII

'111111

AVERAGE

BOTH CHANNELS

IIIn!ll11IIIinUlII11I

iuinIom

.A .IIIII

111111

111111

CROSSTALK

11111

illllll H1"111

20

50

IOO 200 500

IK 2K

FREQUENCY

IN

Hz

5K

IOK

20K

in mono was

17.5

dBf (4.1

pV) with

1.25% THD.

In

stereo,

it was a

rather

high 48 dBf

(77.7 pV)

with 0.56%

THD.

The distortion

was

very low

for

a

re-

ceiver

in

this

price

range, measuring

0.16%

in

mono and 0.32%

in stereo.

(The rated values are

0.4% and 0.8

%.)

The

FM

frequency response

was

±4

dB

from 30 to

15,000 Hz.

There was a

high- frequency

emphasis

and a

re-

duced bass

response.

The

channel

separation

was good at

an

almost

constant

30 to 33

dB from

85 to

8500

Hz.

It

was better

than

25 dB over

the

full audio

range.

The FM capture

ratio

at a

45 -dBf (100 pV)

input

was 1.8 dB,

which

was slightly

better

than

the

rated 2 dB.

The AM rejection

was a

0

20

50

100

200 500

'kHz 2k

Hz

5

FREQUENCY IN

Hz

(CYCLES

PER

SECOND)

-u..

-ó111I

REFERENCE POWER

112.1

HALF

POWER

1 -3087

=JII

-

-LOW

POWER

1 -10061

,111111,

!iIJ!Jii

ii °muuz ti rírioo

1110

ONKYO

TX-220

20

kHz

0.5

.0

very

good 66 dB. Image

rejection

mea-

sured 52.4

dB, bettering

the 50 -dB

rat-

ing.

Alternate -channel

selectivity,

which

was

almost

perfectly

symmetrical

about

the signal

frequency,

was 53.5

dB, slightly short

of

the 60 -dB

rating.

The automatic

stereo

/mono

transition

occurred

smoothly

over an

input

range

of

17

to

25 dBf

(4 to

10

pV).

The

19

-kHz

pilot carrier

leakage

was 51

dB

down.

The

FM tuner was

not equipped

with

interstation noise

muting. The

AM fre-

quency

response was down

6 dB at

70

and

1700 Hz.

User Comment.

When used

with

moderately efficient

speaker

systems,

the Model

TX -220 proved

to

be

a very

smooth

handling

and

generally

fine -

sounding

receiver.

However,

it cannot

be expected

to drive

low -efficiency

speakers

to

satisfactory

volume

levels.

The slightly

accentuated

high -end

re-

sponse

in

the FM

mode added

a

touch

of brightness

and was

no doubt

par-

tially

responsible

for the 56.5

-dB

stereo

S/N

measurement

we

obtained,

1:nORTION

N20 iiii

TION

11'I!l,111111

1A:i11II1

:ìiiiiìiii1I11

;2ÇI1l111111

l

as

iIlrn..

. 1a=a..

==E

.

..

.

m n

IIII=

MIIIII111=

11111

IIIIII=11111I111111

=IÌ1I

..Qi

.

II11mmm.IIII

1111

I111

1

1

IIIII

111111

02 05

2

5

10

20

50 100

CONTINUOUS

AND EQUIVALENT

SINE -WAVE

POWER

OUTPUT

PER CHANNEL

IN

WATTS

MARCH 1976

71

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