3.10.3.9.2 Filters Definition; Channel Settings Copy; How To Setup A Crossover - Martin Audio MA12K - 2010 User Manual

WARNING: when enabled, a lowpass filter cutting around 400 Hz is automatically inserted into the
chain. This feature is intended to be used only for subwoofer applications.
AWG
16
16
16
14
14
14
12
12
12
Another advantage is that you can take in account the voice coil rise in resistance due to heating, getting a
correctly damped bass response in the average working condition. For example, if you run your subwoofer
amplifiers hard during your performance, you should add a negative resistance between 1 and 2 Ohms to
keep the correctly damped response. This value is correct for an 8 Ohm typical subwoofer; remember to
divide it for the number of paralleled speakers on the K amplifier output. Take into account that if you use the
system at a lower level, you should select a smaller negative resistance to avoid an over damped response.
This setting will be linkable to the actual average level automatised in the next firmware release...
Average power
Note the huge amount (3.8 Ohm) when the driver reaches its thermal limit.

3.10.3.9.2 Filters Definition

This feature allows to emulate the parameters input of some commercial audio processors, in order to get
the same equalizer frequency response by simply inputting the same parameter values. You should not learn
some complicated conversion formulas or frequency response definitions to get the same behaviour of the
processor you are used to work with.
In the current version, the supported modes are Powersoft (Type1) and alternative (Type2), contact
Powersoft support for correlation with other Processing Units from other manufacturers.
3.10.4

Channel Settings Copy

By selecting the "CH1+2, copy CH1=>CH2" submenu, all the CH2 DSP settings are cloned from the CH1,
and then the parameters of both channels are changed at the same time.
The same applies for "CH1+2, copy CH2=>CH1".
3.11

How to Setup a crossover

For example, midrange on CH1 and high frequency driver on CH2.
All material © 2010 Martin Audio Ltd. Subject to change without notice
Sq mm
2 x 1.5 mm2
2 x 1.5 mm2
2 x 1.5 mm2
2 x 2.5 mm2
2 x 2.5 mm2
2 x 2.5 mm2
2 x 4 mm2
2 x 4 mm2
2 x 4mm2
Typical cabling resistance.
Power
/ rated power compression
10% 1.4 dB
20% 2.0 dB
50% 2.8 dB
100% 4.5 dB
Typical rise in resistance due to voice coil heating.
Edit CH1, go to LP Filter, set Active=ON
Length Resistance
5 m 0.13 Ohm
10 m 0.26 Ohm
20 m 0.52 Ohm
5 m 0.08 Ohm
10 m 0.16 Ohm
20 m 0.32 Ohm
5 m 0.05 Ohm
10 m 0.10 Ohm
20 m 0.20 Ohm
Equivalent series
resistance for 8 Ohm driver
1.0 Ohm
1.4 Ohm
2.1 Ohm
3.8 Ohm
30