Manual Monacor STA-300D (page 7 of 20) (English, German, Dutch, Danish, French, Italian, Polish, Swedish, Spanish, Finnish)

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5 Connection

Prior to connecting /disconnecting switch off

all units concerned.

5.1 Audio source

It is possible to connect a stereo audio source

with line level, e. g. mixer, preampliﬁer, CD

player. Connect the output of the audio

source to one of the two pairs of jacks on

the connector panel INPUT, either to the XLR

jacks (8) or to the 6.3 mm jacks (9): LEFT =left

channel, RIGHT =right channel.

The 6.3 mm jacks and the XLR jacks are

balanced. Audio sources with unbalanced

output signal can be connected via 2-pole

6.3 mm plugs.

The contacts of the XLR and 6.3 mm jacks

of the same channel are connected to each

other; thus, the jack not used as an input is

available for routing the signal to another

ampliﬁer, for example.

5.2 Speakers

On the connector panel OUTPUT, both 6.3 mm

jacks (11) and Speakon-compatible speaker

jacks (12) are available for speaker connec-

tion. The 6.3 mm jacks and the speaker jacks

are connected in parallel. Connect the two

speakers (minimum impedance: 4 Ω) either

to the 6.3 mm jacks or to the speaker jacks:

LEFT =left channel, RIGHT =right channel.

The switch MODE (7) must be disengaged for

the 2-channel mode.

Insert a Speakon-compatible speaker plug

into the jack and turn the plug clockwise until

it engages. To remove the plug, pull back the

safety latch on the plug and turn the plug

counter-clockwise. At the contacts 2+/ 2−,

the speaker jack LEFT additionally carries the

signal of the right output. This is, for exam-

ple, useful for connecting speaker systems

with separately powered frequency paths (bi-

amping) and for connecting a speaker in the

bridge mode (

☞

chapter 5.2.1).

The power rating of the speakers should

generally not be lower than the output power

of the ampliﬁer (

☞

chapter 8).

5.2.1 Bridge mode

The bridge mode is designed to obtain more

power at a speaker. In the bridge mode, the

two ampliﬁer channels are combined to a

mono ampliﬁer: Engage the button MODE

(7) to activate the bridge mode BRIDGE. The

input signal at the left channel will now be

inverted and sent to the right channel. Thus,

the voltage at the output will be doubled

when the speaker has been connected for

the bridge mode as described below. Signals

at the right input will be ignored.

Connection to the output jack LEFT (12) via

a 4-pole Speakon plug:

L+

R+

≥8 Ω

In the bridge mode, the minimum impedance

of the speaker must be 8 Ω.

5.2.2 Connecting multiple speakers to

one channel

≥8 Ω

When, in the 2-channel mode, multiple

speakers are connected to one

channel, 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 par-

allel, the total impedance will be

half the impedance of the indi-

vidual speakers. In this case, only speakers

with a minimum impedance of 8 Ω must be

used.

When, in the bridge mode, two speakers of

the same impedance are connected in paral-

lel, the minimum impedance of the individual

speakers must be 16 Ω.

5.3 Power supply

For power supply, connect the mains cable

supplied to the mains jack (14) 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 two volume controls (2)

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 (4)

will light up when the ampliﬁer is switched

on.

3) Use the volume controls (2) to adjust the

volume: Control L-CH for the left channel;

control R-CH for the right channel. In the

bridge mode, only use the control L-CH.

If a signal is available, the LED SIGNAL (3)

of the corresponding channel 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 ampliﬁ-

er to a very high volume.

Permanent high volumes

may damage your hear-

ing! Your ear will get ac-

customed to high volumes

which do not seem to be

that high after some time.

Therefore, do not further

increase a high volume

after getting used to it.

If required, engage the switch LIMITER (10)

to activate the automatic level limiter. This

will reduce distortions at high volumes that

might damage the speakers.

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 (5) 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 the 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

Model STA-300D STA-500D

Output power

RMS power

stereo mode at 4 Ω

stereo mode at 8 Ω

bridge mode at 8 Ω

Peak power

2 × 150 W

2 × 100 W

300 W

350 W

2 × 250 W

2 × 150 W

500 W

600 W

Ampliﬁer class D

Input sensitivity

1 V

Input impedance 12 kΩ

Frequency range 20 – 20 000 Hz

S / N ratio > 96 dB

Channel separation > 70 dB

THD < 0.05 %

Power supply 230 V~/ 50 Hz

Power consumption 550 VA 850 VA

Ambient temperature 0 – 40 °C

Dimensions (W × H × D) 482 × 52 × 290 mm (1 RS)

Weight 3.7 kg 4.7 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.

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Monacor STA-300D Manual

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