Blaupunkt EMA 255 manual Bridged loudspeaker connections, High-Pass, Low-passfrequency control

EMA 255

Bridged loudspeaker connections

The EMA amplifier can also be bridged for a mono configura- tion. This allows the amplifier to be used for one or several subwoofers or mid-range drivers. In this configuration, the amplifier combines the right and left channel to a single- channel output (mono output).

Note:

The amplifier can add the right and left signal information only if the right as well as the left RCA connection were carried out.

Caution:

In a bridge circuit, the amplifier load must be 4 ohm or higher. A lower load leads to an overheating or switch-off of the amplifier and can cause permanent damages.

Adjusting the type and range of the frequency crossovers

With the EMA 255, the type of frequency crossover (i.e. "Low Pass" or "Hi-Pass") and the desired entry frequency can be adjusted. For example, if a pair of subwoofers is to be con- nected, the low-pass settings shown are required (Fig. 3). The entry frequency is dependent upon the frequency range of the loudspeakers (see recommended frequency range of the loudspeakers).

High-Pass

At a setting of 80 Hz, the amplifier has a frequency range of 80 Hz to 30,000 Hz.

Low-pass frequency control

This control is active if the switch is in the position "Low-Pass", and allows for setting the desired entry frequency.

Example:

At a setting of 150 Hz, the amplifier has a frequency range of 10 Hz to 150 Hz.

Bass boost

The bass boost control is used to adjust the bass response of the amplifier.

The setting options are: 0 dB / +6 dB / +12 dB.

Power-on indicator (PWR / PRO)

Green LED:

Output stage on, regular operating status.

Red LED:

Output stage is electronically switched off due to an error.

Recycling and disposal

Please use the return and collection systems avail- able to dispose of the product.

Subject to changes

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