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Old 12th June 2006, 06:44 PM   #1
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Question Weird 2 way Crossover

My Panasonic bookshelves ( with a 5 inch aramide glass fibre cone and a 25mm Semi-dome tweeter) are stated to crossover at 4.5 Khz according to the HTIB manual.
And the only components on the crossover pcb are :

2 caps : 2.2 uf and 4.7 uF metallized polyester 75V
One air core inductor. (forgot the value)

What sorta crossover is this ?? I am asking because i want to upgrade it.

I hope that this thread will get atleast one reply.

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Old 12th June 2006, 07:23 PM   #2
RDV is offline RDV  United States
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It's like my Sanyos, it's probably got a 1st order(just a cap) for the tweeter, and 2nd order(cap & inductor) for the woofer.

RDV
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Old 12th June 2006, 07:25 PM   #3
RDV is offline RDV  United States
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The inductor is probably a .56mh if the woofer is 8 ohms.

RDV
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Old 12th June 2006, 07:28 PM   #4
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Any chance of upgrading it or changing it for the better ??
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Old 12th June 2006, 07:33 PM   #5
RDV is offline RDV  United States
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I'm trying to do the same thing and what they're telling me is that without measuring equipment I'm just shooting in the dark so to speak.

Do they sound bad as is?

RDV
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Old 12th June 2006, 07:49 PM   #6
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Quality in an Air Core inductor is harder to achieve than say... upgrading a cap.

It's not like it has a voltage rating. It's not a radio frequency coil, so that doesn't come into play. With Air Core, there is no permeability of the ferrite or other core material to take into account.

If it were me... I'd upgrade the caps and leave the coil alone.
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Old 12th June 2006, 08:00 PM   #7
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They have oodles of detail.No problem with the bass or midrange.
Its got a shiny treble.Getting rid of it by setting treble to -1 in the tone controls.
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Old 12th June 2006, 08:07 PM   #8
RDV is offline RDV  United States
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Quote:
Originally posted by ]|[ GorE
Its got a shiny treble.Getting rid of it by setting treble to -1 in the tone controls.
They probably neglected to pad the tweeter in any way. If you added padding resistors you'd have to change the crossover values then because the impedance would change. It sounds like it would be more trouble than it would be worth IMO.

RDV
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Old 12th June 2006, 09:01 PM   #9
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What do you mean by change of impedance. Isnt that what the R1,R2 of L-padding are supposed to do ?
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Old 12th June 2006, 09:13 PM   #10
RDV is offline RDV  United States
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Quote:
Originally posted by ]|[ GorE
What do you mean by change of impedance. Isnt that what the R1,R2 of L-padding are supposed to do ?
When impedance changes, so does the crossover point.

RDV
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