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Old 31st August 2004, 07:03 AM   #1
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Default shivas sub& bass boost circuit

I am planning on building a sub using a shivas sub driver in the 88.5 ltr sealed box .

my plate amp has a bass boost circuit of 6db @ 35 hz . is this going to cause me any problems .

Is there a way to disable it or lower it . the plate amp is from jaycar
http://www1.jaycar.com.au/productResults.asp?FORM=CAT

the same as these . but different amount of output
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Old 31st August 2004, 08:28 AM   #2
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with winisd PRO + update you can see the resultant response with EQ

Depending on what the response is,and what you like,it may or may not give you what you want.

Yes there is a way to disable it.
search in yahoo for 'critical q subwoofer'
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Old 31st August 2004, 08:38 AM   #3
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What is the Q of the eq on the jaycar amp??
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Old 31st August 2004, 08:52 AM   #4
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I have no idea what the Q is . sorry

also how do i allow for the 6db boost in winisd pro ??
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Old 31st August 2004, 10:05 AM   #5
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I am not sure but if you are using a shiva (I am using a tempest, already have it, just finished the box) you can use lspcad which is a bit more comprehensive. After re-creating your alignment in lsp cad go to the "box/filter/eq" menu and go to equaliser, you will get the predicted effects of the equaliser.

I am guessing you know what the frequency and boost amount is (35hz and 6db), You could say that the Q is the "width" of the boost with the lower the number the wider the area that it affects. For the jaycar amp i would stick it at around 1 for an estimate.
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Old 1st September 2004, 05:31 AM   #6
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Its sallenkey EQ as far as i know,the Q isnt adjustable.

Only the Frequency and magnitude.

LSP cad isnt free?

WIth signal generator and oscilloscope you could measure it and plot :-)

also how do i allow for the 6db boost in winisd pro ??

If you downloaded the PATCH also,on the driver box,theres an EQ tab.


http://members.ozemail.com.au/~joera..._technical.htm

Note that -12db at 10hz is slightly helpful for preventing ported overexcursion(but maynot be enough at extreme power levels)
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Old 1st September 2004, 06:43 AM   #7
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lspCad is free for adire drivers:

http://www.adireaudio.com/TextPages/...eFrameText.htm
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Old 1st September 2004, 08:02 AM   #8
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according to adire audio . I should not use this plate amp on a shivas .

didn't say why. have asked why
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