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Post by Chuck Elliot on Aug 7, 2014 23:56:47 GMT -5
I’ve been writing an application to give a visual view of bass management. I am not quite finished, but I thought I’d show an example. The mains woofer response curve comes from WinISD (freeware). This program has a feature that allows you to get a table of Freq, dB and Phase from a given box design. I have used the data from my DIY project for this. I have mentioned in past threads that the natural roll-off of the mains woofer can come into play in the total response of a system. In the graph the red and blue lines are the L-R 12dB lines with a 100Hz crossover. The mains woofer is in orange. The combined response of the electrical high-pass and the mains woofer is purple. The total system response is cyan. The high-pass slope is no longer 12 dB and the total system response is no longer flat. A 2dB dip occurs below the electrical crossover point. As I complete this I will freely distribute it. Written in Python it should work well on PC or MAC.  |
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hemster
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Particle Manufacturer
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Post by hemster on Aug 8, 2014 2:03:29 GMT -5
^That's awesome Chuck! I'm sure many of us will find this very useful. Thanks for taking this on.
Given it's in Python, will you be distributing the sources so others in the community can contribute? I'm not asking you to, just wondering...
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Post by Chuck Elliot on Aug 8, 2014 2:19:55 GMT -5
^That's awesome Chuck! I'm sure many of us will find this very useful. Thanks for taking this on. Given it's in Python, will you be distributing the sources so others in the community can contribute? I'm not asking you to, just wondering... Absolutely! The whole idea of using Python was to achieve platform independence. As I don't have a MAC, I'd love to find a MAC user here to test it! I still have a lot to do. On thing is I'd like to allow a user to enter a F3 point and type of enclosure sealed/reflex instead of requiring the WinISD step. One thing I can tell you is that mixed slope or a higher order than L-R 12dB gives a smoother response than L-R 12dB. I do this now with my XSP-1 using the hi-pass and my subs using their selectable 24 dB setting.  Chuck |
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Post by urwi on Aug 8, 2014 4:55:54 GMT -5
If one wants to use this for integrating subs and speakers set to small one would need to measure the acoustical in-room response which is very different from the electrical response shown by this software.
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Post by Chuck Elliot on Aug 8, 2014 6:58:24 GMT -5
If one wants to use this for integrating subs and speakers set to small one would need to measure the acoustical in-room response which is very different from the electrical response shown by this software. Yes, but I would want to deal with what's going on electrically before in-room response. You can design a speaker for a room, but I don't think it is prudent. Also think of this program more as a tool of understanding than a tool of implementation. |
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Post by urwi on Aug 8, 2014 10:03:48 GMT -5
If it's prudent or not solely depends on how humans perceive sound in rooms at such low frequencies. What we hear is certainly not the speaker's transient response as there's too much contribution from the room too early in time - 100Hz has a wavelength of more than 11'. In my opinion it's not only prudent but mandatory to fit the speaker response to the room it's playing in. Other than that the software is a great tool for better understanding how phase plays a significant role in how two frequency responses add up. Keep going. If one wants to use this for integrating subs and speakers set to small one would need to measure the acoustical in-room response which is very different from the electrical response shown by this software. Yes, but I would want to deal with what's going on electrically before in-room response. You can design a speaker for a room, but I don't think it is prudent. Also think of this program more as a tool of understanding than a tool of implementation. |
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