Specifications

5 CONTROLS

5.1 Mode Switch

This is mounted internally on the plug-in board and allows the unit when

appropriate, to be switched from 3-way to 4-way operation.

In 3-way mode the (‘mid’) output will function up to the upper bandpass

filter or as defined by system parameters, band 4 (’high’) remains available

and may be used for driving additional VHF units in ‘overlap’ mode.

5.2 Level Controls

Each frequency bands level can be adjusted over a 12dB range from

-6dB to +6dB relative to its nominal level to allow the user to precisely

balance each level with respect to each other.

5.3 Limiters

Each output is fitted with a limiter which provides momentary gain reduction

when the signal level exceeds a preset threshold value. A red LED

indicates the onset of limiting.

Threshold settings for the limiters may be adjusted by first removing the

MX5 top cover (two screws on each side) to gain access to the 16 way

switches which are located on the main motherboard. Setting the limiter

threshold automatically sets the range of the LED display which will indicate

dB’s below threshold.

Threshold values corresponding to the switch positions are printed on the

main motherboard reproduced here for your information.

01 23 45 6 789A BCDEF

0.2 0.4 0.5 0.7 0.9 1.1 1.3 1.4 1.6 1.8 2.0 2.2 2.3 2.5 2.7 2.9

Each channel limiter sets a maximum drive level from the MX5, which in

turn sets the maximum continuous voltage that the amplifier can present to

its load.

The plug-in top board has pre-set time constants that optimise the limiters

for each frequency band.

The limiters in the MX5 may be used to control the average continuous

power applied to the loudspeakers, if power amplifiers with a higher

maximum power rating than that recommended are used. (See Amplifier

section) Alternatively, if the loudspeakers selected will handle the full rated

power, or if maximum system headroom is required, the limiters may be set

to prevent the amplifiers being driven into hard clipping.

Martin Audio – MX5 System Controller

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