These attack times allow the power amplifiers to clip momentarily - but not for 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.
W8CT & W8CM - assuming 600Wcont - 1200Wpk into 4ΩΩ power amplifiers:
Typical Recommended
Amplifier Amplifier Amplifier DX1 LIMITER
Example Sensitivity Gain Settings
dBu VrmsdB LomidHimidHigh
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.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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