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passive vs. active equalizing
passive vs. active equalizing
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Old 12th September 2018, 05:58 PM   #1
silvershadelynx is offline silvershadelynx  Netherlands
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Default passive vs. active equalizing

Hi, just yesterday my MiniDSP 2x4HD's usb connection died. I used it to equalize my DIY electrostatic loudspeakers. I used a very simple electrical segmentation of its wire stators: a 3 cm wide mid segment that runs the full frequency band, and a second segment that is connected through a resistor that acts as a lowpass filter. It is similar to the configurations of the older? Audiostatic esl's. As the frequency response was still not perfectly straight (still a suble dip between 100 and 1000 Hz) and a subtle rising output with rising frequency and a big resonance peak) I found the MiniDSP a very nice addition to filter the resonance peak and attenuate the HF a bit more.

After my DSP died (at least it's usb connection) and because I tend to use my turntable most of the time nowadays (analog input), I'm wondering if it would be better to stop using my dsp alltogether and fine tune / modify my esl segmentation? I could open my panels (I made everything detachable) and "re-group" the wire stators? (create more segments for better equalising the HF rise of my stat panels) By the way, the diaphragm measures 18cm width x 100 cm height, and I use supple copper wires. I'm not sure if the 18 cm width will be enough to add extra segments?

What are your opinions about active DSP-ing vs. passive equalizing using segmented stators? (or using both methods as I currently do) Would it be better do do most of the frequency correction in the stators themselves rather than relying, at least for a part, at a DSP device?

Last edited by silvershadelynx; 12th September 2018 at 06:01 PM.
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Old 14th September 2018, 05:07 AM   #2
Calvin is offline Calvin  Germany
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Join Date: Nov 2004
Location: close to Basel

the Mini-DSP though beeing a powerful tool for evaluation is imho a clear sonic bottleneck.
At that low pricepoint You canīt expect a first class A/D-D/A conversion ... which is imho the reason for most DSP filterīs sonic performance - the filtering itself (calculation of algorithms) seems acoustically transparent.
Even a top notch DSP Filter like the one from 4Audio sounded more technical and less musical than my feedbackless JFET-xover (in a acoustically decent room that is).
Not until switching to acourate software filtering and implementing first class DACs the DSP-filter became the sonically superior solution (fed of course from digital sources, otherwise the ADC could spoil the result again).

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Old 14th September 2018, 11:23 AM   #3
TBTL is offline TBTL  Germany
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DSP is way more powerful than passive solutions. Rough passive (or active analog) EQ can still be a good idea to avoid running into limitations of the dynamic range of a DSP.
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