# Standardizing crossover components values?

#### Barreldrinker

Hello

I'm new to passive crossovers. Forgive me if this is a dumb question.

I am also trying to use a 4th order linkwitz riley crossover(in my case 2.5k), and I found the following values through a calculator.

C1=8.44 µF
C2=16.88 µF
L1=0.16 mH
L2=0.72 mH
C3=25.33 µF
C4=5.63 µF
L3=0.48 mH
L4=0.24 mH

However, I have no idea how to "standardize" them as the thread I found says.
(e.g. changing 8.44uF to 10uF)

As I understand it, the calculator multiplies cratio and lratio by a certain value, and it seems that increasing or decreasing these ratios by the same percentage will result in a completely different filter.
Can anyone tell me how to "standardize" specifically?

Did quite a research but couldn't find the answer

#### AllenB

Paid Member
Perhaps it's worth using a simulator, since they can be set to jump to these values. Create the filter you want, then bump them up and down to see what is possible.

#### Barreldrinker

I'm currently using vituixcad and trying to put several capacitances and inductances here.
However, I haven't found the feature to fix specific cap value and have it follow linkwitz riley's formulas.
Is there any simulator out there that has this feature?

#### AllenB

Paid Member
LR means Q=0.5

1. How will both components be standard values and equal 0.5 exactly.. that's unlikely? What is the benefit?

2. The filter won't use the same values for different speakers since their impedance and response requirements vary..

#### hobbit25

Hello

I'm new to passive crossovers. Forgive me if this is a dumb question.

I am also trying to use a 4th order linkwitz riley crossover(in my case 2.5k), and I found the following values through a calculator.

C1=8.44 µF
C2=16.88 µF
L1=0.16 mH
L2=0.72 mH
C3=25.33 µF
C4=5.63 µF
L3=0.48 mH
L4=0.24 mH

However, I have no idea how to "standardize" them as the thread I found says.
(e.g. changing 8.44uF to 10uF)

As I understand it, the calculator multiplies cratio and lratio by a certain value, and it seems that increasing or decreasing these ratios by the same percentage will result in a completely different filter.
Can anyone tell me how to "standardize" specifically?

Did quite a research but couldn't find the answer
Check out a component supplier such as Solen https://solen.ca/en to see what "standard" capacitors and inductors are available.

Odd value capacitors can be created by combining various values in parallel (or series). Custom inductors can be tweaked by partially unwinding larger inductors to obtain the values you need, though this is a little tricky knowing when to stop. An inexpensive LCR component tester such as a Mega328 or GM328 may be of assistance. You can google these on Ebay or Amazon.

#### Barreldrinker

Well, my original understanding was that LR crossover circuit is a ratio not a fixed value, so that I can make an equivalent circuit with various values of C and L.(so I can fix one cap value and adjust the other components likewise)

I think my understanding was wrong, and now I think I should find the closest caps and coils that the calculator gave me. Plus I don't have to get the exact component the LR calc gave, but rather modify the values by the vituixcad simulation curve plot to make it closer to ideal LR curve.

Can someone verify that my understanding is correct?

#### MarcelvdG

What you can sometimes do is tweak the crossover frequency a bit so the component values get closer to standard values (usually E6 or E12, see https://en.m.wikipedia.org/wiki/E_series_of_preferred_numbers ). That boils down to scaling all inductances and capacitances with the same factor, keeping their ratios the same.

#### AllenB

Paid Member
modify the values by the vituixcad simulation curve plot to make it closer to ideal LR curve.

Can someone verify that my understanding is correct?
Close enough for now