For further notes on system patching, including cluster sub-section controller and
amplifier allocations see Section 1.4.
2.5 DX1 gain & limiter settings
Standardising on one good model of power amplifier (preferably the Martin Audio
MA2.8) and correctly set-up controller (preferably the Martin Audio DX1) will
provide the most dynamic system performance and protection whilst simplifying
design and reducing spares inventories.
The Martin Audio DX1 Loudspeaker Management System may be user-programmed
for a wide range of touring configurations based on its 2 input + sum, 6 output matrix.
This operation is best completed by an audio technician who is familiar with DSP -
based pro-audio equipment. (See Section 1.5 and DX1 Speaker Management System
User's Guide for further details)
Gain settings
The following initial DX1 output gain settings will enable full system performance to
be obtained whilst keeping the console and drive system noise floors inaudible and
avoiding amplifier slew-rate limiting:
W8CT & W8CM - assuming 600Wcont - 1200Wpk into 4ΩΩ power amplifiers:
Best-fit Initial DX1
Amplifier Amplifier Amplifier Output GAIN
Example Sensitivity Gain LomidHimidHigh
dBu VrmsdB dB dB dB
Martin MA2.8* (38dB) -2 0.62 38 -9 -9 -9
Crest CA9 (x68) -1 0.69 37 -8 -8 -8
Crown MA1202 (0.775v) 0 0.77 36 -7 -7 -7
+1 0.87 35 -6 -6 -6
QSC PL224 +2 0.98 34 -5 -5 -5
+3 1.09 33 -4 -4 -4
Martin MA2.8* (32dB) +4 1.23 32 -3 -3 -3
Crest 4801 (x40) +4 1.23 32 -3 -3 -3
Crown K1 (1.4v) +4 1.23 32 -3 -3 -3
QSC PL218/218A (32dB) +4 1.23 32 -3 -3 -3
QSC PL224A (32dB) +4 1.23 32 -3 -3 -3
Crown MA1202 (1.4v) +5 1.38 31 -2 -2 -2
+6 1.55 30 -1 -1 -1
+7 1.73 29 0 0 0
+8 1.95 28 +1 +1 +1
+9 2.18 27 +2 +2 +2
Crown MA1202 (26dB) +10 2.45 26 +3 +3 +3
Crown K1 (26dB) +10 2.45 26 +3 +3 +3
QSC PL218A (26dB) +10 2.45 26 +3 +3 +3
QSC PL224A (26dB) +10 2.45 26 +3 +3 +3
* Set MA2.8 rear MLS switch to -2dB.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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