Cerwin Vega Stroker 18S Qtc=0.707


Driver parameters:
Qts=0.191
Fs=31.00 Hz
Vas=5.78 cu. ft
SPL=96.0 dB 1W 1m
max power=1600 W RMS
Diameter=0.457 m
Xmax=0.019 m

Calculated parameters:
Vd=0.002155 m^3
n0=0.025119

Fc=114.75 Hz
F3=114.77 Hz
Vb=0.46 cu. ft
Par=341.410 acoustic W
Per=13591.76 W

Thermal and Xmax limited SPL as a function of frequency:

Hz SPL thermal SPL xmax Power xmax
2.0 57.69 dB 66.98 dB 13591.8 W
4.0 69.73 dB 79.03 dB 13591.8 W
6.0 76.78 dB 86.07 dB 13591.9 W
8.0 81.77 dB 91.07 dB 13592.1 W
10.0 85.65 dB 94.94 dB 13592.6 W
12.0 88.82 dB 98.11 dB 13593.5 W
14.0 91.50 dB 100.79 dB 13594.9 W
16.0 93.81 dB 103.11 dB 13597.1 W
18.0 95.86 dB 105.15 dB 13600.2 W
20.0 97.69 dB 106.98 dB 13604.6 W
22.0 99.34 dB 108.64 dB 13610.4 W
24.0 100.85 dB 110.15 dB 13618.1 W
26.0 102.24 dB 111.54 dB 13628.0 W
28.0 103.52 dB 112.83 dB 13640.4 W
30.0 104.72 dB 114.03 dB 13655.8 W
32.0 105.83 dB 115.15 dB 13674.6 W
34.0 106.88 dB 116.20 dB 13697.2 W
36.0 107.86 dB 117.19 dB 13724.2 W
38.0 108.79 dB 118.13 dB 13756.1 W
40.0 109.67 dB 119.03 dB 13793.4 W
42.0 110.50 dB 119.87 dB 13836.8 W
44.0 111.30 dB 120.68 dB 13886.8 W
46.0 112.05 dB 121.45 dB 13944.1 W
48.0 112.77 dB 122.19 dB 14009.3 W
50.0 113.46 dB 122.90 dB 14083.3 W
52.0 114.11 dB 123.58 dB 14166.6 W
54.0 114.74 dB 124.24 dB 14260.2 W
56.0 115.34 dB 124.87 dB 14364.7 W
58.0 115.91 dB 125.48 dB 14481.0 W
60.0 116.46 dB 126.07 dB 14610.0 W
62.0 116.99 dB 126.64 dB 14752.5 W
64.0 117.50 dB 127.19 dB 14909.6 W
66.0 117.98 dB 127.72 dB 15082.0 W
68.0 118.45 dB 128.24 dB 15270.8 W
70.0 118.89 dB 128.75 dB 15477.1 W
72.0 119.32 dB 129.24 dB 15701.8 W
74.0 119.73 dB 129.71 dB 15946.0 W
76.0 120.12 dB 130.18 dB 16210.8 W
78.0 120.49 dB 130.63 dB 16497.3 W
80.0 120.85 dB 131.07 dB 16806.8 W
82.0 121.20 dB 131.50 dB 17140.3 W
84.0 121.53 dB 131.91 dB 17499.2 W
86.0 121.84 dB 132.32 dB 17884.6 W
88.0 122.14 dB 132.72 dB 18297.9 W
90.0 122.43 dB 133.11 dB 18740.3 W
92.0 122.70 dB 133.49 dB 19213.2 W
94.0 122.96 dB 133.87 dB 19717.9 W
96.0 123.21 dB 134.23 dB 20255.9 W
98.0 123.45 dB 134.59 dB 20828.6 W
100.0 123.67 dB 134.94 dB 21437.4 W




In this alignment the Aura 1808 driver is thermal limited. There is no Xmax / thermal crossover point.

This speaker just doesn't work in a sealed box alignment. If you drop the Qtc to .500 the box volume rises to about 1 cu ft and even then, 2kW input still doesn't cut it! Check out this speakers Xmax/thermal Qtc=.500 plot. Put this speakers in a 4 cu ft box, operate it below its ~80Hz resonance, put a -12dB/octave LPF at 10Hz or a bass boost of +36dB at 10Hz and you are ready to rock!

Or put it in a Qtc=.310 box and do +24dB boost at 10Hz with a Q=2.0, this will flatten the frequency response from 10Hz - 40Hz. The region from 40Hz+ will have a -6dB/octave slope which could be all out of wack anyway with room modes. It will be +12dB up at the F3 of 147Hz and this will cause some serious sub/sat blending problems. Another option is +24dB boost at 20Hz with a Q=2.0 and bump up 10Hz with a +10dB boost, this would make things fairly flat from 10Hz to 160Hz. What a piecemeal mess. Toss in room modes correction, consider the phase mess that has just been created and it is debatable if this concoction is superior to a vented alignment. You are probally better off using the driver the way it was designed to be used!

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