BRAX MATRIX X4 Instruction Manual page 10

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Stereo Bridged: Select the stereo bridged mode for using the channels A/B or C/D in the mono mode. In this mode both

channels are bridged to one channel (mono). The respective LED (ST.BRGD) lights up blue. At position STEREO BRID-

GED both inputs of A/B or of C/D respectively have to be used.

Mono Bridged: According to the mode stereo bridged the ampliﬁer is switched to mono and both channels will be bridged

to one channel. If you select MONO BRIDGED only the input A or C respectively has to be used. This can be neces-

sary if there is only one mono signal available. The respective LED (MONO BRGD) lights up blue.

11-12 CPS - Colour Protection System

The LEDs show the operation status of the ampliﬁer. Yellow (11) = malfunction: short-circuit at speaker output;

Red (12) = overheated: If the amp shuts off due to overheating it will take some time (depending on the outside tempera-

ture) until it switches on again.

Impedance selection

The output power of the ampliﬁer BRAX Matrix X4 is independent from impedance. By using the impedance selector (13)

the impedance of the connected loudspeaker system (4 Ohms, 2 Ohms or 1 Ohm) has to be selected. If several loudspea-

kers are connected to one channel, the impedance can be approximately calculated as follows:

series connection:

parallel connection:

Please note: A special case of calculating the impedance is the bridged mode, i.e. the operation of the channels A/B or

C/D in the mode stereo bridged or mono bridged. In this case the total impedance has to be divided by two once more.

Please note that the total impedance is not lower than 1 Ohm per channel. If the connected loudspeaker impedance is

below the selected impedance, the ampliﬁer turns into protection mode.

Example: Two 4 Ohms loudspeakers are connected parallely to the channels A and B and the channels C/D are operated

with two parallely connected 4 Ohms loudspeakers in the bridged mono mode.

Impedance Lsp. A and Lsp. B

Impedance Lsp. C/D

Thus, for channels A/B you have to select an impedance of 2 Ohms and for channels C/D you have to select an impedance

of 1 Ohm.

= Z x n

(n= amount of loudspeakers; Z= loudspeaker impedance)

tota

= Z / n

tota

= 4 Ohms / 2 = 2 Ohms

= (4Ohms / 2) / 2 = 1 Ohms

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