very old Celestion hifi Box come in for a tweeter replacement and before deciding what to do with it h checked the crossover and found this seen in the schematic
The lower part is a third order network fine and understood
the upper part i have never seen before
anyone has an idea ?
I could suppose a high freq boost but obviously this is going to be a phase night mare
What is the use of R1 and C3?
The lower part is a third order network fine and understood
the upper part i have never seen before
anyone has an idea ?
I could suppose a high freq boost but obviously this is going to be a phase night mare
What is the use of R1 and C3?
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Since the value is small it might be a premium bypass cap to add some airy' ness. Amount of effect is limited by R1. It does work but very subtle.
I do it with some mkt1837 or mkt1822's although on each cap and not bypass entire network. May be it's worth to simulate your case in virtuix etc.
I do it with some mkt1837 or mkt1822's although on each cap and not bypass entire network. May be it's worth to simulate your case in virtuix etc.
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It is well known that JBL bypassed many caps in the crosoosver with 0.22 MKT
benefit of that is known
Point is that this network appears to bypass almost the all filter , then one can assume that provides a faster path for some ammount of higher frequencies to deliver to the tweter regardless of the filter operation
If this thought is correct obviously additional signal deliverd to the tweeter will have some phase issues
if this is correct i canot predict if this is right or wrong
and what is the use or benefit from that
benefit of that is known
Point is that this network appears to bypass almost the all filter , then one can assume that provides a faster path for some ammount of higher frequencies to deliver to the tweter regardless of the filter operation
If this thought is correct obviously additional signal deliverd to the tweeter will have some phase issues
if this is correct i canot predict if this is right or wrong
and what is the use or benefit from that
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This was discussed here. Seems to me, the jury is out.
https://www.diyaudio.com/community/...ap-construction-for-crossover-network.314726/
https://www.diyaudio.com/community/...ap-construction-for-crossover-network.314726/
Cal this is not a bypass capacitor as discussed onthe other post
This capacitor bypasses the all filter ( almost )
This capacitor bypasses the all filter ( almost )
I think it's to make subtle phase adjustments, you may be able to sim this in Xsim.
Troels does this a lot.
Troels does this a lot.
This filter creates a notch in the stopband. This usually increases the rolloff slope while not affecting phase as much around the knee. It is sometimes done to get a steep slope with few components.
