Some measurements I took.. - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 3 Old 10-14-08, 06:00 PM Thread Starter
Senior Shackster
mike
 
Join Date: Dec 2006
Location: Montreal,Quebec
Posts: 108
Some measurements I took..

I finally got around and had the time to take a few measurements... my setup is a 4 driver IB(tempests) sub powered by a Crest 2600 at 2 ohms... or 1100 watts per pair.



First measurement no eq.



I took a few more... to be sure and one with a +5 boost at around 20 hz..





This is the info on Rew...

SPL measurement data saved by Room EQ Wizard V4.11
Source: Input device not selected, no input selected, Right channel, volume: no control
Format: 512k Log Swept Sine, 1 sweep
using mic/meter cal file:
C:\Documents and Settings\Administrator\Desktop\RADIOSHACK-33-2055_4050.cal
using soundcard cal file:
C:\Documents and Settings\Administrator\Desktop\RADIOSHACK-33-2055_4050.cal
Dated: 12-Oct-2008 6:55:35 PM
REW Settings:
C-weighting compensation: On
Target level: 75.0 dB
Note: last meas
Measurement: Oct 12 18:55:35
Frequency Step: 0.36561334 Hz
Start Frequency: 9.979248 Hz

9.979 68.871
10.345 69.646
10.710 70.856
11.076 71.964
11.442 72.846
11.807 73.454
12.173 73.847
12.539 74.171
12.904 74.447
13.270 74.837
13.635 75.381
14.001 75.968
14.367 76.517
14.732 76.956
15.098 77.251
15.463 77.423
15.829 77.499
16.195 77.575
16.560 77.755
16.926 77.937
17.292 78.138
17.657 78.348
18.023 78.551
18.388 78.709
18.754 78.870
19.120 79.045
19.485 79.301
19.851 79.505
20.216 79.701
20.582 79.952
20.948 80.222
21.313 80.517
21.679 80.818
22.044 81.067
22.410 81.218
22.776 81.198
23.141 81.017
23.507 80.774
23.873 80.578
24.238 80.601
24.604 80.889
24.969 81.310
25.335 81.653
25.701 81.886
26.066 82.043
26.432 82.233
26.797 82.452
27.163 82.716
27.529 83.002
27.894 83.247
28.260 83.410
28.626 83.526
28.991 83.695
29.357 84.037
29.722 84.512
30.088 85.022
30.454 85.398
30.819 85.600
31.185 85.581
31.550 85.323
31.916 84.780
32.282 83.963
32.647 82.918
33.013 81.780
33.379 80.840
33.744 80.562
34.110 81.133
34.475 82.306
34.841 83.537
35.207 84.560
35.572 85.266
35.938 85.630
36.303 85.615
36.669 85.234
37.035 84.513
37.400 83.490
37.766 82.234
38.131 80.891
38.497 79.676
38.863 78.784
39.228 78.209
39.594 77.766
39.960 77.278
40.325 76.738
40.691 76.179
41.056 75.745
41.422 75.514
41.788 75.559
42.153 75.745
42.519 75.934
42.884 75.970
43.250 75.833
43.616 75.540
43.981 75.135
44.347 74.656
44.713 74.182
45.078 73.754
45.444 73.375
45.809 73.057
46.175 72.823
46.541 72.719
46.906 72.806
47.272 73.085
47.637 73.500
48.003 73.967
48.369 74.422
48.734 74.825
49.100 75.174
49.465 75.486
49.831 75.822
50.197 76.239
50.562 76.765
50.928 77.368
51.294 77.973
51.659 78.535
52.025 79.020
52.390 79.469
52.756 79.817
53.122 80.081
53.487 80.293
53.853 80.506
54.218 80.736
54.584 80.977
54.950 81.200
55.315 81.380
55.681 81.460
56.047 81.406
56.412 81.179
56.778 80.816
57.143 80.353
57.509 79.848
57.875 79.302
58.240 78.753
58.606 78.231
58.971 77.762
59.337 77.363
59.703 77.044
60.068 76.803
60.434 76.627
60.800 76.489
61.165 76.356
61.531 76.197
61.896 75.989
62.262 75.716
62.628 75.377
62.993 74.980
63.359 74.542
63.724 74.085
64.090 73.631
64.456 73.202
64.821 72.800
65.187 72.434
65.552 72.119
65.918 71.874
66.284 71.673
66.649 71.545
67.015 71.502
67.381 71.588
67.746 71.718
68.112 71.871
68.477 72.028
68.843 72.169
69.209 72.286
69.574 72.392
69.940 72.515
70.305 72.653
70.671 72.825
71.037 73.023
71.402 73.243
71.768 73.437
72.134 73.596
72.499 73.731
72.865 73.873
73.230 74.012
73.596 74.148
73.962 74.279
74.327 74.430
74.693 74.560
75.058 74.661
75.424 74.726
75.790 74.779
76.155 74.825
76.521 74.856
76.886 74.849
77.252 74.782
77.618 74.653
77.983 74.465
78.349 74.226
78.715 73.935
79.080 73.599
79.446 73.238
79.811 72.865
80.177 72.505
80.543 72.176
80.908 71.885
81.274 71.629
81.639 71.399
82.005 71.180
82.371 70.960
82.736 70.729
83.102 70.482
83.468 70.224
83.833 69.963
84.199 69.711
84.564 69.479
84.930 69.272
85.296 69.086
85.661 68.913
86.027 68.750
86.392 68.596
86.758 68.456
87.124 68.335
87.489 68.236
87.855 68.163
88.221 68.121
88.586 68.120
88.952 68.167
89.317 68.263
89.683 68.400
90.049 68.564
90.414 68.740
90.780 68.918
91.145 69.095
91.511 69.269
91.877 69.438
92.242 69.603
92.608 69.762
92.973 69.916
93.339 70.067
93.705 70.214
94.070 70.359
94.436 70.501
94.802 70.643
95.167 70.788
95.533 70.942
95.898 71.106
96.264 71.278
96.630 71.454
96.995 71.627
97.361 71.794
97.726 71.958
98.092 72.123
98.458 72.292
98.823 72.466
99.189 72.640
99.555 72.806
99.920 72.960
100.286 73.098
100.651 73.220
101.017 73.329
101.383 73.426
101.748 73.510
102.114 73.580
102.479 73.633
102.845 73.666
103.211 73.680
103.576 73.672
103.942 73.637
104.307 73.573
104.673 73.476
105.039 73.347
105.404 73.192
105.770 73.021
106.136 72.842
106.501 72.664
106.867 72.488
107.232 72.317
107.598 72.151
107.964 71.998
108.329 71.867
108.695 71.767
109.060 71.700
109.426 71.663
109.792 71.643
110.157 71.629
110.523 71.609
110.889 71.578
111.254 71.534
111.620 71.475
111.985 71.405
112.351 71.327
112.717 71.246
113.082 71.165
113.448 71.087
113.813 71.014
114.179 70.947
114.545 70.883
114.910 70.821
115.276 70.758
115.642 70.691
116.007 70.621
116.373 70.551
116.738 70.488
117.104 70.438
117.470 70.404
117.835 70.379
118.201 70.350
118.566 70.305
118.932 70.239
119.298 70.157
119.663 70.068
120.029 69.985
120.394 69.914
120.760 69.853
121.126 69.793
121.491 69.730
121.857 69.660
122.223 69.587
122.588 69.514
122.954 69.442
123.319 69.363
123.685 69.270
124.051 69.154
124.416 69.011
124.782 68.844
125.147 68.660
125.513 68.465
125.879 68.268
126.244 68.073
126.610 67.882
126.976 67.696
127.341 67.513
127.707 67.332
128.072 67.150
128.438 66.967
128.804 66.782
129.169 66.597
129.535 66.413
129.900 66.232
130.266 66.054
130.632 65.876
130.997 65.691
131.363 65.495
131.728 65.287
132.094 65.073
132.460 64.863
132.825 64.664
133.191 64.480
133.557 64.304
133.922 64.130
134.288 63.948
134.653 63.759
135.019 63.567
135.385 63.381
135.750 63.202
136.116 63.030
136.481 62.860
136.847 62.690
137.213 62.522
137.578 62.361
137.944 62.207
138.310 62.059
138.675 61.909
139.041 61.750
139.406 61.580
139.772 61.403
140.138 61.227
140.503 61.057
140.869 60.894
141.234 60.733
141.600 60.564
141.966 60.383
142.331 60.192
142.697 60.000
143.062 59.817
143.428 59.646
143.794 59.479
144.159 59.299
144.525 59.094
144.891 58.863
145.256 58.620
145.622 58.383
145.987 58.162
146.353 57.950
146.719 57.732
147.084 57.497
147.450 57.253
147.815 57.022
148.181 56.826
148.547 56.665
148.912 56.514
149.278 56.342
149.644 56.132
150.009 55.896

You guys see any area I can improve on?

Thanks...
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post #2 of 3 Old 10-14-08, 06:48 PM
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brucek
 
Join Date: Apr 2006
Posts: 7,514
Re: Some measurements I took..

Your sweep measurement should be set to 0Hz-200Hz and then the graphs posted with a vertical scale of 45dB-105dB and a horizontal scale of 15Hz-200Hz. No data is required. Post graphs 800 pixels wide.

I would say it looks quite good, but you need some EQ around 35Hz and around 55Hz. I would remove the boost at 20Hz.

brucek
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post #3 of 3 Old 10-14-08, 09:52 PM
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Wayne A. Pflughaupt's Avatar
 
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Location: Katy, Texas
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Re: Some measurements I took..


I'd remove the 20 Hz boost filter and use a couple of filters to lower response below ~40 Hz to the 75 dB Target Curve. Then maybe cut the peak at ~55 Hz.

Regards,
Wayne



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