Bedienungsanleitung Monacor STA-553D (Seite 7 von 20) (Deutsch, Englisch, Holländisch, Dänisch, Französisch, Italienisch, Spanisch, Polnisch, Schwedisch, Finnisch)

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5 Connection

Prior to connecting /disconnecting switch off

all units concerned.

5.1 Audio source

The connections of all inputs are balanced.

When connecting audio sources with unbal-

anced output signal, additionally connect the

ground connection “G” to “−”.

5.1.1 Operating mode “2-CH”

1) Engage the switch INPUT MODE (10).

Connect a stereo audio source with line

output level, e. g. mixer, preampliﬁer, CD

player. Connect the output of the audio

source to the terminals (7): L-CH (left chan-

nel) and R-CH (right channel).

In this operating mode, the signal for the

low-frequency channel SUB is created from

the stereo input channel.

5.1.2 Operating mode “3-CH”

1) Disengage the switch INPUT MODE (10).

For the high-frequency/mid-frequency

channels, connect a stereo audio source

with line output level, e. g. mixer, pream-

pliﬁer, CD player. Connect the output of

the audio source to the terminals (7): L-CH

(left channel) and R-CH (right channel).

3) For the low-frequency channel, connect a

mono audio source with line output level

to the terminals SUB, e. g. mono output

of a mixer.

5.2 Speakers

Connect the speakers (minimum impedance:

4 Ω) to the plug-in screw terminals on the

connector panel OUTPUT (11): L-CH =left

channel (mid-range / high-range frequency),

R-CH =right channel (mid-range / high-range

frequency), SUB =subwoofer (low-range fre-

quency). Make sure that the cable ends are

only stripped for the length required and that

no bare wires protrude (hazard of contact and

short circuit). When connecting the speakers

make sure that all speakers have the same

polarity.

The power rating of the speakers should

generally not be lower than the output power

of the ampliﬁer (

☞

chapter 8).

5.2.1 Connecting multiple speakers to

one channel

≥8 Ω

For the connection of two speakers to one

output, a second row of terminal

screws connected in parallel is

available. When multiple speak-

ers are connected to one chan-

nel, the total impedance of the

speakers must not fall below 4 Ω

at any channel; otherwise, the

amplifier may be damaged.

When two speakers of the same impedance

are connected in parallel, the total impedance

will be half the impedance of the individual

speakers. In this case, only speakers with a

minimum impedance of 8 Ω must be used.

5.3 Power supply

For power supply, connect the mains cable

supplied to the mains jack (13) and then to a

socket (230 V~/ 50 Hz).

6 Operation

Hint: To prevent switching noise, always switch on

the other units of the audio system before switching

on the power ampliﬁer and switch off the power

ampliﬁer before switching off the other units.

1) Before switching on the ampliﬁer for the

ﬁrst time, set the three volume controls (3)

to zero to make sure that the initial volume

will not be too high.

2) Use the POWER switch (1) to switch the

ampliﬁer on and off. The power LED ON (2)

will light up when the ampliﬁer is switched

on.

Adjust the volume controls (3) in such a

way that an ideal balance between the

high-frequency/mid-frequency range and

the low-frequency range is obtained: Con-

trols L-CH / R-CH for the left /right chan-

nels of the high-frequency/mid-frequency

range, control SUB for the low-frequency

range (subwoofer). If a signal is available,

the LED SIG (5) of the corresponding chan-

nel will light up (depending on the setting

of the volume control). In case of overload

of a channel, the corresponding red LED

CLIP (6) will light up. Turn back the control

accordingly.

CAUTION

Never adjust the ampliﬁer to a

very high volume. Permanent

high volumes may damage

your hearing! Your ear will

get accustomed to high vol-

umes which do not seem to

be that high after some time.

Therefore, do not further in-

crease a high volume after

getting used to it.

6.1 Filter setting

The high pass ﬁlters of the two high-frequen-

cy/mid frequency outputs L-CH and R-CH and

the low pass ﬁlter of the low-frequency out-

put serve as crossover network.

1) Use the controls 󱚄R-CH and 󱚄L-CH (8)

to adjust the crossover frequency of the

high pass ﬁlters.

Use the control 󱚅SUB (9) to adjust the

crossover frequency of the low pass ﬁlter.

3) If required, use the volume controls (3) to

adjust the balance of the channels.

When adjusting the frequency, take the

frequency range of the connected speakers

into account. Operating a speaker outside its

frequency range may cause distortions and

overload the speaker.

7 Protective Circuit

The protective circuit is designed to prevent

damage to the speakers and to the ampliﬁer.

When the protective circuit is active, the LED

PROT (4) will light up:

– for a few seconds after the ampliﬁer has

been switched on (switch-on delay)

– when the ampliﬁer is overheated or when

there is a short-circuit at a speaker output

If an LED PROT lights up during operation or if

it fails to extinguish after switch-on, switch off

the ampliﬁer and eliminate the source of error.

8 Speciﬁcations

Ampliﬁer class: � � � � � � � � � D

Output power

RMS power CH-1/2: � � � � 2 × 150 W at 4

Ω

2 × 100 W at 8

Ω

RMS power SUB: � � � � � � 250 W at 4

Ω

160 W at 8

Ω

Peak power: � � � � � � � � � � � 600 W

Input sensitivity: � � � � � � � � 1�5 V

Input impedance: � � � � � � � 14 k

Ω

Frequency range: � � � � � � � � 20 – 20 000 Hz

High / low pass ﬁlter: � � � � � 50 – 250 Hz,

12 dB/octave

S / N ratio: � � � � � � � � � � � � � > 96 dB

Channel separation: � � � � � > 70 dB

THD: � � � � � � � � � � � � � � � � � < 0�05 %

Power supply: � � � � � � � � � � 230 V~/ 50 Hz

Power consumption: � � � � � 820 VA max�

Ambient temperature: � � � � 0 – 40 °C

Dimensions (W × H × D): � 482 × 52 × 290 mm,

(1 RS)

Weight: � � � � � � � � � � � � � � � 4�5 kg

Subject to technical modiﬁcation.

INTERNATIONAL GmbH & Co. KG. No part of this instruction manual

may be reproduced in any form or by any means for any commercial use.

Monacor STA-553D Seite 7

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