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Discussion Starter #1 (Edited)
I finally got my UXL-18 and I wanted to do some modeling. Should I use the published .wdr file for the driver or what I measured on WT3? I did use the Mass method for my calculations.



Here is the sub date from WT3----WIN ISD
* Piston Diameter = 387.4 mm
* f(s)= 20.86 Hz-------------------19.35
* R(e)= 3.29 Ohms---------------3.200
* Z(max)= 65.71 Ohms
* Q(ms)= 6.120------------------9.29
* Q(es)= 0.323--------------------.332
* Q(ts)= 0.307--------------------.302
* V(as)= (9.432 cubic feet)----9.197 Cubic Feet
* L(e)= 4.82 mH
* n(0)= 0.72 %
* SPL= 90.65 1W/1m-------------89.07
* M(ms)= 424.80 grams
* C(ms)= 0.14 mm/N
* BL= 23.83 ---------------------25.93



 

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Hey man...

Your measured RE and Qes, Qts, Fs, Vas all came in very close.

I would go ahead and make a WinISD file for the measured specs and compare them to the factory ones. I bet you $1 that they are VERY close to each other (Leave inductance out). Enough that it won't matter at all.

Could you do me a favor and post a large high res screen capture of the impedance curve measured by the WT3 with the upper end up to at least 2khz? Also the full list of specs spit out by the WT3 would be cool. Pretty please?:hyper:

Basically what I am looking for here is the inductance. The parameter given by WT3 is at 1khz and useless for sub modeling. How the impedance behaves above 100Hz is much more telling. If it starts rolling upward dramatically right off of the bat it is going to have some roll off. If it continues relatively flatly for awhile and gradually starts to increase that is a sign of a better performance.
 

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Discussion Starter #4 (Edited)

https://picasaweb.google.com/lh/photo/TqHGfbdMUBA5AgXiSQGAItMTjNZETYmyPJy0liipFm0?feat=directlink


* This data was exported from the Dayton Audio WT3 Woofer Tester
*
* Manufacturer:
* Model:
* Piston Diameter = 387.4 mm
* f(s)= 20.86 Hz
* R(e)= 3.29 Ohms
* Z(max)= 65.71 Ohms
* Q(ms)= 6.120
* Q(es)= 0.323
* Q(ts)= 0.307
* V(as)= 267.100 liters (9.432 cubic feet)
* L(e)= 4.82 mH
* n(0)= 0.72 %
* SPL= 90.65 1W/1m
* M(ms)= 424.80 grams
* C(ms)= 0.14 mm/N
* BL= 23.83
*
*
Freq Impedance Phase
1.029 3.401 6.656
1.059 3.401 6.656
1.091 3.401 6.656
1.122 3.401 6.656
1.155 3.401 6.656
1.189 3.401 6.656
1.224 3.401 6.656
1.260 3.401 6.656
1.297 3.401 6.656
1.335 3.405 13.490
1.374 3.405 13.490
1.414 3.405 13.490
1.456 3.405 13.490
1.498 3.405 13.490
1.542 3.405 13.490
1.587 3.405 13.490
1.634 3.405 13.490
1.682 3.405 13.490
1.731 3.405 13.490
1.782 3.405 13.490
1.834 3.405 13.490
1.888 3.405 13.490
1.943 3.405 13.490
2.000 3.489 20.732
2.059 3.489 20.732
2.119 3.489 20.732
2.181 3.489 20.732
2.245 3.489 20.732
2.311 3.489 20.732
2.378 3.489 20.732
2.448 3.489 20.732
2.520 3.489 20.732
2.594 3.489 20.732
2.670 3.662 26.070
2.748 3.662 26.070
2.828 3.662 26.070
2.911 3.662 26.070
2.997 3.662 26.070
3.084 3.662 26.070
3.175 3.662 26.070
3.268 3.662 26.070
3.364 3.927 30.994
3.462 3.927 30.994
3.564 3.927 30.994
3.668 3.927 30.994
3.775 3.927 30.994
3.886 3.927 30.994
4.000 4.223 35.324
4.117 4.223 35.324
4.238 4.223 35.324
4.362 4.223 35.324
4.490 4.223 35.324
4.621 4.223 35.324
4.757 4.539 39.197
4.896 4.539 39.197
5.040 4.539 39.197
5.187 4.539 39.197
5.339 4.891 42.752
5.496 4.891 42.752
5.657 4.891 42.752
5.823 4.891 42.752
5.993 5.269 45.945
6.169 5.269 45.945
6.350 5.269 45.945
6.536 5.269 45.945
6.727 5.689 48.804
6.924 5.689 48.804
7.127 5.689 48.804
7.336 6.148 51.538
7.551 6.148 51.538
7.772 6.148 51.538
8.000 6.645 53.938
8.234 6.645 53.938
8.476 6.645 53.938
8.724 7.204 56.118
8.980 7.204 56.118
9.243 7.204 56.118
9.514 7.797 58.085
9.792 7.797 58.085
10.079 8.474 59.745
10.375 8.474 59.745
10.679 9.238 61.360
10.992 9.238 61.360
11.314 10.100 62.627
11.645 10.100 62.627
11.986 11.130 63.873
12.338 11.130 63.873
12.699 12.292 64.898
13.071 12.292 64.898
13.454 13.665 65.730
13.849 13.665 65.730
14.254 15.259 66.552
14.672 17.211 67.001
15.102 17.211 67.001
15.545 19.666 67.095
16.000 22.738 66.534
16.469 22.738 66.534
16.951 27.002 65.050
17.448 32.598 62.135
17.959 40.427 56.843
18.486 40.427 56.843
19.027 50.900 47.646
19.585 61.549 24.456
20.159 62.772 17.053
20.749 65.708 0.186
21.357 63.258 -16.405
21.983 57.760 -30.201
22.627 51.830 -41.762
23.290 44.088 -51.033
23.973 35.992 -56.744
24.675 30.260 -59.877
25.398 26.083 -61.626
26.143 22.969 -62.515
26.909 20.402 -63.338
27.697 18.163 -63.341
28.509 16.366 -63.488
29.344 14.459 -62.771
30.204 12.905 -61.907
31.089 12.042 -61.151
32.000 11.039 -59.544
32.938 10.129 -58.134
33.903 9.420 -56.184
34.896 8.864 -53.933
35.919 8.382 -51.972
36.971 7.931 -50.078
38.055 7.515 -48.362
39.170 7.073 -46.315
40.317 6.824 -44.992
41.499 6.538 -43.333
42.715 6.188 -40.848
43.967 5.901 -38.210
45.255 5.668 -35.468
46.581 5.478 -32.806
47.946 5.309 -30.237
49.351 5.164 -27.737
50.797 5.040 -25.231
52.285 4.936 -22.666
53.817 4.833 -19.578
55.394 4.753 -16.611
57.018 4.709 -14.415
58.688 4.670 -11.240
60.408 4.665 -8.593
62.178 4.668 -6.071
64.000 4.682 -3.642
65.875 4.698 -0.984
67.806 4.721 1.532
69.792 4.760 3.939
71.838 4.808 6.249
73.943 4.859 8.442
76.109 4.913 10.607
78.339 4.980 12.851
80.635 5.048 14.533
82.998 5.134 16.279
85.430 5.226 17.949
87.933 5.320 19.523
90.510 5.430 21.197
93.162 5.546 22.759
95.892 5.675 24.379
98.701 5.785 25.726
101.594 5.905 27.069
104.571 6.032 28.357
107.635 6.162 29.502
110.789 6.309 30.616
114.035 6.446 31.566
117.377 6.594 32.524
120.816 6.740 33.472
124.356 6.894 34.397
128.000 7.026 35.104
131.751 7.164 35.851
135.611 7.321 36.753
139.585 7.452 37.573
143.675 7.594 38.438
147.885 7.743 39.266
152.219 7.919 40.136
156.679 8.107 40.982
161.270 8.282 41.712
165.995 8.466 42.419
170.860 8.652 43.077
175.866 8.855 43.740
181.019 9.038 44.285
186.324 9.233 44.810
191.783 9.459 45.405
197.403 9.671 45.924
203.187 9.873 46.388
209.141 10.104 46.845
215.269 10.324 47.298
221.577 10.537 47.729
228.070 10.762 48.131
234.753 10.991 48.521
241.632 11.224 48.921
248.712 11.471 49.340
256.000 11.719 49.711
263.501 11.979 50.079
271.223 12.255 50.440
279.170 12.509 50.743
287.350 12.798 51.021
295.770 13.066 51.289
304.437 13.333 51.584
313.358 13.629 51.904
322.540 13.933 52.203
331.991 14.250 52.484
341.719 14.572 52.724
351.732 14.913 52.872
362.039 15.221 53.007
372.647 15.541 53.199
383.567 15.900 53.418
394.806 16.271 53.528
406.375 16.647 53.604
418.282 17.023 53.587
430.539 17.415 53.441
443.155 17.748 53.206
456.140 18.018 53.062
469.506 18.281 53.087
483.264 18.597 53.181
497.424 18.898 53.145
512.000 19.126 53.193
527.003 19.366 53.531
542.445 19.693 54.003
558.340 20.085 54.410
574.701 20.504 54.718
591.541 20.923 54.967
608.874 21.347 55.193
626.715 21.791 55.397
645.080 22.247 55.538
663.982 22.701 55.670
683.438 23.151 55.827
703.464 23.617 56.005
724.077 24.108 56.149
745.294 24.608 56.265
767.133 25.111 56.365
789.612 25.619 56.459
812.749 26.131 56.558
836.565 26.658 56.683
861.078 27.205 56.797
886.309 27.769 56.892
912.280 28.346 56.975
939.012 28.935 57.036
966.527 29.535 57.073
994.849 30.138 57.108
1024.000 30.754 57.140
1054.005 31.394 57.171
1084.890 32.050 57.178
1116.680 32.724 57.120
1149.401 33.384 56.960
1183.081 33.953 56.782
1217.748 34.455 56.745
1253.431 34.994 56.896
1290.159 35.645 57.095
1327.964 36.360 57.229
1366.876 37.087 57.295
1406.929 37.816 57.327
1448.155 38.551 57.344
1490.589 39.282 57.348
1534.266 39.988 57.355
1579.224 40.687 57.418
1625.499 41.432 57.529
1673.129 42.236 57.626
1722.156 43.051 57.700
1772.619 43.881 57.767
1824.561 44.726 57.830
1878.024 45.592 57.887
1933.055 46.473 57.942
1989.697 47.367 57.996
2048.000 48.281 58.057
2108.011 49.218 58.114
2169.780 50.172 58.165
2233.360 51.146 58.210
2298.802 52.135 58.254
2366.162 53.142 58.291
2435.496 54.164 58.330
2506.862 55.205 58.370
2580.318 56.277 58.413
2655.927 57.367 58.452
2733.752 58.472 58.485
2813.857 59.593 58.512
2896.309 60.727 58.542
2981.178 61.878 58.582
3068.533 63.053 58.629
3158.448 64.255 58.678
3250.997 65.488 58.725
3346.259 66.752 58.772
3444.312 68.038 58.817
3545.238 69.347 58.860
3649.121 70.681 58.902
3756.049 72.036 58.945
3866.109 73.423 58.989
3979.395 74.839 59.032
4096.000 76.281 59.074
4216.022 77.746 59.116
4339.561 79.235 59.160
4466.720 80.755 59.208
4597.605 82.307 59.260
4732.325 83.892 59.312
4870.992 85.509 59.366
5013.723 87.164 59.418
5160.637 88.852 59.472
5311.855 90.573 59.526
5467.504 92.332 59.581
5627.714 94.121 59.637
5792.619 95.948 59.694
5962.355 97.821 59.751
6137.066 99.728 59.810
6316.896 101.676 59.870
6501.995 103.668 59.929
6692.518 105.704 59.989
6888.623 107.775 60.049
7090.476 109.899 60.110
7298.242 112.074 60.169
7512.097 114.289 60.229
7732.218 116.550 60.292
7958.790 118.865 60.358
8192.000 121.235 60.424
8432.044 123.654 60.489
8679.122 126.128 60.553
8933.439 128.660 60.618
9195.209 131.250 60.685
9464.649 133.898 60.751
9741.985 136.604 60.818
10027.447 139.377 60.887
10321.273 142.229 60.956
10623.710 145.144 61.023
10935.008 148.126 61.090
11255.428 151.181 61.157
11585.238 154.313 61.223
11924.711 157.523 61.289
12274.132 160.813 61.355
12633.791 164.181 61.419
13003.989 167.636 61.483
13385.035 171.177 61.546
13777.247 174.811 61.607
14180.951 178.543 61.666
14596.485 182.375 61.724
15024.194 186.306 61.781
15464.437 190.342 61.835
15917.579 194.486 61.887
16384.000 198.747 61.937
16864.088 203.118 61.985
17358.243 207.604 62.030
17866.879 212.219 62.071
18390.418 216.983 62.110
18929.299 221.874 62.141
19483.969 226.644 62.085
20054.893 229.793 61.402
20642.546 225.904 57.683
 

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The second one looks mighty interesting, can you tell us more ?
 

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Discussion Starter #10
The second one I am not sure of the port will work how I have it setup, but I do like the design as I keep going back to it. The reason is my applications has limited space, it will slide into an opening under my TV. I could not fit a long enough port so I split it at the end but has the same volume as a traight port. I am going to make a few more designs and see what other options I have. The general specs are 20cuft, tuned to 15hz, First port resonance is ~154hz.
 

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This might be silly of me, but- my understanding of how a port works is that the driver resonates the air in the enclosure with its backwave. So won't porting the vent across the face of the driver interfere with that? I don't mean any disrespect for your design; I'm just trying to understand.
Thanks.
Tom
 

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Discussion Starter #13
This might be silly of me, but- my understanding of how a port works is that the driver resonates the air in the enclosure with its backwave. So won't porting the vent across the face of the driver interfere with that? I don't mean any disrespect for your design; I'm just trying to understand.
Thanks.
Tom
Tom,

That is not a silly question, honestly I have no real knowledge in sound design, I am just expirmenting, so any help I can get is great. I will look into more of what you speak of. The more I look at my design maybe what I need to do is reasearch transmission lines or tapped horns?
 

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That looks much better to me. The guys I talked to about the port exiting across the face of the driver all agreed that wasn't optimal, or recommended. I think what you have now looks like a killer design; I'll follow along to see how it develops.

Tom
 

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Not sure where why you are getting 37 m/s velocity. I am getting 20 m/s with 700 watts input power. That's max input power based on 22 cu ft with two drivers without going over max excurison.
 
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