long enough to be obvious to listeners or cause driver overheating. It is quite normal
to see amplifier clip indicators on the odd programme peak but continuous clipping
would indicate a cable short circuit, wrong controller settings, excessive power
amplifier gain or low mains voltage.
The following DX1 output limiter settings will avoid voice coil overheating and
minimise amplifier clipping for high quality, trouble free operation.
W8C - assuming 300Wcont - 600Wpk into 8ΩΩ power amplifiers:
Best-fit Recommended
Amplifier Amplifier Amplifier DX1 LIMITER
Example Sensitivity Gain Lomid Himid High
dBu Vrms dB dBu dBu dBu
Martin MA2.8* (38dB) -2 0.62 38 -3 -6 -9
Crest CA9 (x68) -1 0.69 37 -2 -5 -8
Crown MA1202 (0.775v) 0 0.77 36 -1 -4 -7
+1 0.87 35 0 -3 -6
QSC PL224 +2 0.98 34 +1 -2 -5
+3 1.09 33 +2 -1 -4
Martin MA2.8* (32dB) +4 1.23 32 +3 0 -3
Crest 4801 (x40) +4 1.23 32 +3 0 -3
Crown K1 (1.4v) +4 1.23 32 +3 0 -3
QSC PL218/218A (32dB) +4 1.23 32 +3 0 -3
QSC PL224A (32dB) +4 1.23 32 +3 0 -3
Crown MA1202 (1.4v) +5 1.38 31 +4 +1 -2
+6 1.55 30 +5 +2 -1
+7 1.73 29 +6 +3 0
+8 1.95 28 +7 +4 +1
+9 2.18 27 +8 +5 +2
Crown MA1202 (26dB) +10 2.45 26 +9 +6 +3
Crown K1 (26dB) +10 2.45 26 +9 +6 +3
QSC PL218A (26dB) +10 2.45 26 +9 +6 +3
QSC PL224A (26dB) +10 2.45 26 +9 +6 +3
* Set Martin Audio MA2.8 rear MLS switch to -2dB to match peak output of
unregulated power amplifiers.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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