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Build help and troubleshooting => EQ573 Equaliser => Topic started by: Slembones on July 15, 2026, 04:39:16 PM

Title: EQ573-II ran in my lab
Post by: Slembones on July 15, 2026, 04:39:16 PM

(https://i.imgur.com/6wqXGxb.png) 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

Title: Re: EQ573-II ran in my lab
Post by: JPK on July 15, 2026, 06:34:38 PM

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?

Title: Re: EQ573-II ran in my lab
Post by: Slembones on July 15, 2026, 09:40:06 PM

can I mod the unit to be flat to 50K and restore the shelf

Title: Re: EQ573-II ran in my lab
Post by: Slembones on July 15, 2026, 09:41:51 PM

the unit is beginning rolling off at 10K even with the band switches set to "off"

Title: Re: EQ573-II ran in my lab
Post by: Slembones on July 15, 2026, 10:02:09 PM

(https://i.imgur.com/jR8oopR.png) the red Line is switched out and the blue Lin is switch in but with all bands "off"

Title: Re: EQ573-II ran in my lab
Post by: Slembones on July 15, 2026, 10:18:42 PM

(https://i.imgur.com/fyPvHs5.png)This sweep has about 6dB boost and cut you can see the roll off. I also included a flat setting