1.5.2 DX1 Output Gain and Limiter settings for the W8
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.
Gain settings
The following 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:
W8 - assuming 300Wcont - 600Wpk into 8ΩΩ power amplifiers:
Best-fit Initial DX1
Amplifier Amplifier Amplifier Output GAIN
Example Sensitivity Gain Lomid Himid High
dBu Vrms dB dB dB dB
Martin MA2.8* (38dB) -2 0.62 38 -9 -9 -7
Crest CA9 (x68) -1 0.69 37 -8 -8 -6
Crown MA1202 (0.775v) 0 0.77 36 -7 -7 -5
+1 0.87 35 -6 -6 -4
QSC PL224 +2 0.98 34 -5 -5 -3
+3 1.09 33 -4 -4 -2
Martin MA2.8* (32dB) +4 1.23 32 -3 -3 -1
Crest 4801 (x40) +4 1.23 32 -3 -3 -1
Crown K1 (1.4v) +4 1.23 32 -3 -3 -1
QSC PL218/218A (32dB) +4 1.23 32 -3 -3 -1
QSC PL224A (32dB) +4 1.23 32 -3 -3 -1
Crown MA1202 (1.4v) +5 1.38 31 -2 -2 0
+6 1.55 30 -1 -1 +1
+7 1.73 29 0 0 +2
+8 1.95 28 +1 +1 +3
+9 2.18 27 +2 +2 +4
Crown MA1202 (26dB) +10 2.45 26 +3 +3 +5
Crown K1 (26dB) +10 2.45 26 +3 +3 +5
QSC PL218A (26dB) +10 2.45 26 +3 +3 +5
QSC PL224A (26dB) +10 2.45 26 +3 +3 +5
* Set Martin Audio MA2.8 rear MLS switch to -2dB to match peak output of
unregulated power amplifiers.
Cluster balance (eg farfield-to-nearfield or inner-to-outer) should be adjusted at the
power amplifier controls to maintain limiter tracking. See Section A1.7.
Balancing the system using gain controls in the signal path before the power
amplifiers will cause the higher signal level upper row of a big cluster to start limiting
before the lower signal levels downfills causing tonal changes at the mix position.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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