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Old 15th July 2008, 04:06 AM   #11
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Either way it would have helped. "Upgrade" would be to replace worn out parts - still no science behind more expensive of the same stuff.

My work here is done.
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Old 15th July 2008, 04:52 AM   #12
awedio is offline awedio  United States
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>My work here is done.

OK, you can go home now. Not sure that you have done any work, other than to explain how "science" fails to corroborate differences between capacitors... (actually, there are hard measurable numbers to describe the differences in performance, even between similar film caps. How that relates to what we hear is a bit tougher to quantify.

Now, let's roll up our sleeves:

First of all, that 9V battery is indeed a "bias" battery. It keeps the caps "formed" by biasing them up by 9V. This is not an active XO.

Second of all, this is NOT the speaker crossover. This is a 100Hz high-pass filter that does its work at line-level.

I'm not sure I would expect really big changes by swapping out caps in here. The InfiniCaps are quite good, not the $0.05 parts our skeptic friends were hoping for - these are something like $15 retail. At double that price I would recommend Mundorf Silver/Oil caps, but they are large and you may have a tough time fitting them in. You could bypass the Wimas with silver Mica for not a lot of money or time involved.
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Old 15th July 2008, 05:25 AM   #13
wheezer is offline wheezer  United States
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Yup HP filter and a PITA to roll amps into my system.
I have K40 and Gudeman caps of the same value to swap for the infini and wima caps. I figure someone must have tried a parts change, for better or worse.
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Old 15th July 2008, 05:43 AM   #14
Pano is offline Pano  United States
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Those InfiCaps look like polystyrene. Are they? I like polystyrene caps - they just don't come in large values.

Maybe the red Wimas could be replaced....
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Old 15th July 2008, 11:40 AM   #15
sreten is offline sreten  United Kingdom
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Hmmm.....

A biased capacitor line level crossover ..... 100Hz high pass allegedly.
What is it adjustable for ? levels, frequency or both ?
(edit : Its input impedance matching for the correct frequency....)

$600 a pair ? Hmmm...... and you want to upgrade the components ....

Looks a trifle complicated when this can be achieved by the
input coupling capacitor of most power amplifiers quite easily.

FWIW the capacitors appear to be paralled film types, and you
do not get much better than the large (not value) polystyrenes.

http://www.stereophile.com/floorloud...06vandersteen/

The stereophile review seems to indicate a classic case of lack of
BSC in the 100Hz to 500Hz range and no easy way to passively
fix this (unless the overall subwoofer gain can be adjusted).
I am not prepared to argue the point, they seem to be flawed.

I would set about trying to adjust this, cannot do any real harm.
(unfortunately passive line level BSC down to 100Hz and passive
100hz high pass do not mix very well in the same passive circuit ....)

If the subwoofer overall level can be adjusted the BSC could
simply be included in the power amplifier feedback network,
and to get rid of the box (has to be an upgrade ? ...) you
can also changed the power amplifier input coupling.

/sreten.
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Old 15th July 2008, 12:30 PM   #16
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Quote:
Originally posted by sdclc126
Oh it's an active XO - thanks for saying so. Don't touch it.

Quote:
Originally posted by awedio
[B]>My work here is done.

OK, you can go home now. Not sure that you have done any work

well, he confused the original poster into thinking it was an active crossover... I suppose that's work......
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Old 15th July 2008, 01:29 PM   #17
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Quote:
Originally posted by luvdunhill






well, he confused the original poster into thinking it was an active crossover... I suppose that's work......
Active/passive/line level - doesn't matter - design is more important than components in audible performance differences.
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Old 15th July 2008, 01:36 PM   #18
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"OK, you can go home now. Not sure that you have done any work, other than to explain how "science" fails to corroborate differences between capacitors... (actually, there are hard measurable numbers to describe the differences in performance, even between similar film caps. How that relates to what we hear is a bit tougher to quantify."

Yup - thanks for helping me make my point.

"First of all, that 9V battery is indeed a "bias" battery. It keeps the caps "formed" by biasing them up by 9V. This is not an active XO."

Doesn't matter - it's still a filter/XO and expensive components won't make any audible difference.

"Second of all, this is NOT the speaker crossover. This is a 100Hz high-pass filter that does its work at line-level."

See response above.

"I'm not sure I would expect really big changes by swapping out caps in here."

Sounds like we're on the same page here.
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Old 15th July 2008, 01:38 PM   #19
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Quote:
Originally posted by sdclc126


Active/passive/line level - doesn't matter - design is more important than components in audible performance differences.

my point is that you couldn't even identify the proper design.
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Old 15th July 2008, 03:33 PM   #20
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And my point is your point is irrelevant, as was my error. Wheezer's question was:

"Has anyone upgraded the caps in the external crossover?" My "point" was he'd be wasting his money.
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