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Old 23rd January 2006, 09:11 PM   #1
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Default zaphaudio hivi b3s crossover question...

i was trying to analyze that filter designed by zaph for the hi-vi b3s project, link here:

http://www.zaphaudio.com/audio-speaker18.html

and i cant figure out what part of the crossover is the high pass part...i think the inductor paired up with the resistor on the first part serves as a low pass for this full range driver....and the next part of the filter seems to be a notch filter, probably to tame some peak....so does this mean that nothing is filtering out the low bass signals? might this damage the driver?

notice: i am NOT criticizing zaph cuz i know he is a genius and everything...i just want to know why he does what he does, so i can learn...
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Old 23rd January 2006, 09:23 PM   #2
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The inductor and resistor in parallel form a baffle step compensation network. The other network is a notch filter to remove the cone breakup node at 8kHz.

You don't normally need to filter out the low bass frequencies on a full-range driver, however if you read further down, Zaph says these need a sub with a proper sub crossover as they distort heavily below 100 Hz.
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Old 23rd January 2006, 10:36 PM   #3
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i did read that, but it does say that freq under 100 Hz cause distortion...doesnt this mean that a high pass crossover should be included with the full range drivers to eliminate this distortion?
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Old 23rd January 2006, 10:52 PM   #4
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I presume that by a proper sub crossover, he means one which feeds the high pass to the small speakers, and the low pass to the sub driver.
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Old 24th January 2006, 12:06 AM   #5
owdi is offline owdi  United States
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If you are going to use a subwoofer, you should use an active highpass crossover for the B3S. This is a common feature in todays receivers, usually enabled by setting your speaker type to small, then configuring the crossover point. Another bonus to this method is the receiver should take the low frequency material that is filtered out and mix it into the subwoofer output.

Using a passive highpass crossover under 200hz for the B3S drivers is possible, but not economical.

What amplifer/receiver do you plan on using?

Dan
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Old 24th January 2006, 12:50 AM   #6
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i am using a slightly older aiwa mini system..rated about 30 watts/channel....it wont have a crossover setting so i guess i need to design one....around 200 Hz is a good xover point?
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Old 24th January 2006, 06:12 AM   #7
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anybody?
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Old 24th January 2006, 10:45 AM   #8
sreten is offline sreten  United Kingdom
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Hi,

designing high pass crossovers for the satelites in a sub / sat set
up in extremely difficult due to the influence of the sats units bass
resonance.

You haven't read "Use an active subwoofer crossover!" on your link ?

It has a design for a passive high pass.

/sreten.
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Old 24th January 2006, 03:52 PM   #9
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ahh...so ur saying that an active sub crossover would also have high level speaker outputs with a built in high pass crossover?
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Old 24th January 2006, 03:58 PM   #10
sreten is offline sreten  United Kingdom
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I'm not saying anything :

http://www.zaphaudio.com/audio-speaker18.html

read "Use an active subwoofer crossover!"

/sreten.
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