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Crossover capacitors? Exactly how critical is the value Z?

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Posted on May 26, 2019 at 12:21:57
AdamC
Audiophile

Posts: 2525
Location: Connecticut
Joined: June 6, 2001
 I know caps can be any tolerance from 5% to20%
..a speaker project rebuild of a crossover..states..
A 55uF..a 56uF
Is commonly found..
Any problem with the 56 if?

.
The trouble with doing nothing, is that you can't tell when you are finished.

 

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RE: Crossover capacitors? Exactly how critical is the value Z?, posted on June 1, 2019 at 23:29:12
Coner
Audiophile

Posts: 3703
Location: S.W. Washington state, USA
Joined: November 17, 2001
 Do the math and find the answer, very simple.

 

RE: Crossover capacitors? Exactly how critical is the value Z?, posted on September 3, 2021 at 13:29:16
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 If I were rebuilding a crossover? I'd be more cocerned the values on the L/R speakers were matched in some fashion.
Might not even be out of line to measure bare drivers for DCR and whateverelse you can manage.


Too much is never enough

 

RE: Crossover capacitors? Exactly how critical is the value Z?, posted on September 19, 2021 at 14:20:15
sony6060
Audiophile

Posts: 1465
Location: USA
Joined: August 8, 2014
 Very critical. Change values and you screw up the crossover point. Results in a hole in the response or distortion.

 

RE: Crossover capacitors? Exactly how critical is the value Z?, posted on September 22, 2021 at 12:25:29
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 Most caps have a tolerance of 20%.....at least that's true of the large PS 'Lytics.

the smaller stuff? 10%? Stilla big range.....espcially if you get a + followed by a - which makes the sides not match....

I see some Clarity caps rated to 3% which means I wouldnt' worry at all....
Is that now common?
Too much is never enough

 

RE: Crossover capacitors? Exactly how critical is the value Z?, posted on December 11, 2021 at 14:02:15
I'm an Audio God
Audiophile

Posts: 13
Location: S London
Joined: February 14, 2004
 I doubt it. have you measured the exact value of old one and the one in the other crossover assuming it stereo. typically the impedance will range from 6 to 24ohms across the audio freq band.

 

RE: Crossover capacitors? Exactly how critical is the value Z?, posted on December 14, 2021 at 13:56:43
pictureguy
Audiophile

Posts: 22597
Location: SoCal
Joined: October 19, 2008
 IF the crossover were a brick wall, you may have a 'hole' point.

But with normal slope of such electronics? I'm not TOO worried. As driver 'A' decreases, driver 'B' will be on the up. If done right, they should Sum Flat thru the passband.

That's at tleast the idea behind my panels. LP and HP are not at the same frequency....but cross around 600hz. they are Magnepan 1.6, a 2-way.
The measurmens by stereophile YEARS ago show a flat sum thru the passband...or near enought.

I do the sub crossover the SAME way. Sub crosses at some low frequency 45hz or 50hz with a 24db octave slope. HP to the panel is at 55hz to 60hz with a 12 db octave slow. NO middle gap......Seems to work fine and I did it mainly by EAR with a little bit of just LOOKING at the graphs with the idea of minimizing driver overlap.....
Too much is never enough

 

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