Onkyo E 30 Service Manual

Page 2

BLOCK DIAGRAM

MAX.RANGE
r ' """""""""""""""""""" 7
INPUT / , / OUTPUT
/ DEFEAT '
, 1
/ SdB/IOdB
/ /
v I
r / 15Hz
I /
BUFFER , CONTROL/ r BUFFER
AMP / AMP / AMP
r /
5GB 8 LOWCUT
y->
FILTER
/
i (-
10dB 5
son
was
Muting circuit
Band level controls
125m 25on 500m 1000Hz ZOOOHI 4000Hz 8000Hz 16000Hz
4- <- <- 4
7/7 777'

G-VV

32Hz

V

V

V

45Hz I
63Hz

Low range center 757'
frequency switch

CIRCUIT DESCRIPTION

1

l

l

Semiconductor inductors

An ideal flat amp is of course the most desirable type of preamplifier to have. However because cartridge and speaker
characteristics along with room conditions are not necessarily ideal, the sound that reaches the listeners ears is usually
a waveform that has many peaks and dips. If these peaks and clips are large, the influence they have may become audible
It is at this point that some sort of control over sound quality becomes necessary. One easy to use means of doing thisis the
ordinary type of tone controls that correct high and low range responses The purpose of an audio equalizer such as the E730

is to go a step further and give the user the means to emphasize or attenuate the sound at many points on the audio spectrum
and thereby greatly improve the audible soundr

Tone con troll

Gain

7-,.

Frequency

Gain

Audio equalizer

Frequency