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Old 26th June 2007, 08:03 AM   #1
Buzzy is offline Buzzy  Singapore
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Default Winisd help

Hi ! I was playing around with winisd and modeled a subwoofer.The pic is how the freq response looks like . However the whole freq response falls below the -3dB line . Would this mean that the subwoofer will not work ? By the way which value should i look at in winisd to tell if the bass would be loose or muddy ? Thankz
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Old 26th June 2007, 09:14 AM   #2
Did it Himself
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You have modelled a bandpass subwoofer. What it's telling you by being below the nominal 0dB line is that you have sacrificed efficiency for bandwidth.

The Q value is generally what highlights if the sound will be loose or tight, but there are also other factors.
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Old 26th June 2007, 12:45 PM   #3
Buzzy is offline Buzzy  Singapore
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Actually i selected vented box, i dunno how it could become bandpass. And in vented box I can't find the Q value. As for the efficiency, how does it affect sound ? Will it sound softer ?
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Old 26th June 2007, 12:52 PM   #4
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So what's the driver you are using?
Is it already in the Winisd database or do you have the specs for it?
What size cabinet are you using?

That drop after 100Hz is something I've only seen in a bandpass box but I'm quite new to sub design myself.

Regards,
Martin.
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Old 28th June 2007, 08:19 AM   #5
Buzzy is offline Buzzy  Singapore
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That driver is a peerless 830500.
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Old 28th June 2007, 09:01 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
that bump in the response at the 20Hz end indicates a high Q.
This is likely to result in a prominent one note effect.
If you also have some room reinforcement below 30 to 40Hz that will make the 20Hz to 25Hz Q seem even worse.

I was advised to aim for a droopy low end response imitating Bessel roll-off. I am very happy with the result.
The response falls at 3db/octave from 100Hz to 25Hz and then rolls off more steeply below leaving 20Hz about 8db below 100Hz.
No one note effect, no exaggeration of male voice, no thump thump when not intended. And I can turn up the bass output control on the active filter when I want a little headbanging (it is quite subtle).
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