3. EQ573-II ran in my lab
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Author Topic: EQ573-II ran in my lab

July 15, 2026, 04:39:16 PM
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Slembones

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EQ573-II ran in my lab
 this is the hi freq eq tests. the boost is a bell when it should be a shelf. the cut is a shelf. Did I do something wrong?  please advise. the unit works fine but thought I would lab test. the plots for mid and low are as expected
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July 15, 2026, 06:34:38 PM
Reply #1

JPK

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Re: EQ573-II ran in my lab
It is a shelf but it is followed by a high frequency attenuation after 20kHz caused by the compensation caps in the circuit.
Can you make another diagram with a +/-6dB correction?
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JPK
July 15, 2026, 09:40:06 PM
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Slembones

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Re: EQ573-II ran in my lab
can I mod the unit to be flat to 50K and restore the shelf
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July 15, 2026, 09:41:51 PM
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Slembones

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Re: EQ573-II ran in my lab
the unit is beginning rolling off at 10K even with the band switches set to "off"
« Last Edit: July 15, 2026, 10:00:36 PM by Slembones »
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July 15, 2026, 10:02:09 PM
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Slembones

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Re: EQ573-II ran in my lab
 the red Line is switched out and the blue Lin is switch in but with all bands "off"
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July 15, 2026, 10:18:42 PM
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Slembones

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Re: EQ573-II ran in my lab
This sweep has about 6dB boost and cut you can see the roll off. I also included a flat setting 
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