1.5.2 DX1 Output Gain and Limiter settings for W8Cs
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:
W8C - assuming 300Wcont - 600Wpk into 8
Ω
Ω
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 1.7.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
Summary of Contents for Wavefront W8CT
Page 130: ...All material 2007 Martin Audio Ltd Subject to change without notice...
Page 138: ...W8LC outline dimensions All material 2007 Martin Audio Ltd Subject to change without notice...
Page 139: ...W8LM outline dimensions All material 2007 Martin Audio Ltd Subject to change without notice...
Page 140: ...W8LX outline dimensions All material 2007 Martin Audio Ltd Subject to change without notice...
Page 148: ...All material 2007 Martin Audio Ltd Subject to change without notice...