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Active filter board GB

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#1,109
Wanting to know if this is a good project for my 4 boards

Hi Every one,

I am the fortunate owner of 2 GB neo 10 units.

The system I want to build was covered in the German magazine Hobby Hifi of January 2008.

http://www.audax-speaker.de/index.p...=imported/tests-reviews/pro20d-hobby-hifi.pdf

I want to know if this is a reasonable candidate for the filter boards, and if there are still people around willing to look over my shoulder to offer some help.

Cheers
Peter
 
#1,110
I was able to get this active filter working together with the designed PSU, Thanks to Jens and Bob.
Though I noticed, I can still hear some mid+high in LF and some upper bass in HF channel near the crossover point. Forgive me for my ignorance, but is this really what this filter was designed for? My designed crossover frequency was 300hz. Or is it dependent on the tested music material.
Reason is I'm planning to use this for DIY tapped horn and full range for PA (with a limited budget).
Can this filter qualify as steep crossover?
 
#1,111
rolandong said:
I can still hear some mid+high in LF and some upper bass in HF channel near the crossover point. Forgive me for my ignorance, but is this really what this filter was designed for? My designed crossover frequency was 300hz. ...............
Can this filter qualify as steep crossover?
Click to expand...
what filter slopes did you adopt?
single pole, two pole, three pole, or four pole?

a Butterworth filter is -3dB @ the rolloff frequency.
A 4pole 300Hz low pass filter will be approximately -26dB @ 600Hz. That is not silence. That is easily heard.
 
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#1,112
To demonstrate to yourself how little attenuation that is, pop in a set of foam earplugs. Most are rated at 27-29 dB attenuation. You can still hear an awful lot with the plugs in.

And the crew laughed at me when I wore plugs and muffs on the flight deck. An F-14 in afterburner was somewhere around 150 dB at 50 feet.😱
 
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