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Old 30th January 2013, 09:03 PM   #11
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thx Bjorno, I just finished the speaker.
I did as you suggest, the 160 liters one.
It's sounds a little strange in the frequency response, there's a huge gap in the between the 40-55Hz and 70-90Hz with almost -13dB lower with the 85Hz frequency, while the 60Hz is +6,8dB louder??? what went wrong?
I meausured some frequencies between 20 and 100Hz and came wth the following numbers:

Hz dB Variation
20 85,6 0
25 86,1 0,5
30 93,6 7,5
35 97,6 4
40 104,4 6,8
45 103,2 -1,2
50 97,9 -5,3
55 97,7 -0,2
60 104,3 6,6
65 109,9 5,6
70 100,9 -9
75 98,5 -2,4
80 95,1 -3,4
85 82,3 -12,8
90 87,1 4,8
95 91,9 4,8
100 95,5 3,6

I would like to hear some suggestion of where did I went wrong. I'm using an active crossover crossed at 200Hz to my scan speak 8545 midbass.

Thx

Murillo
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Old 30th January 2013, 09:13 PM   #12
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Were those measurements taken in room? It seems as though you may be seeing room effects. What do you get if you do a nearfield measurement of the cone and port (or even put the mic inside the speaker cabinet?

Tony.
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Old 30th January 2013, 09:23 PM   #13
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hi Tony, the mic was inside the port. Thx for asking.
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Old 31st January 2013, 02:27 PM   #14
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update, I used an FFT software and its flat. may have made a wrong measuring procedure.
Thx for all help.
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