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Multi-Way Conventional loudspeakers with crossovers

How do I integrate L-Pad components into crossover?
How do I integrate L-Pad components into crossover?
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Old 2nd February 2018, 01:58 AM   #1
Rob41 is offline Rob41  United States
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Default How do I integrate L-Pad components into crossover?

So I've come up with what I want for a 2-way crossover:

2way Crossover.jpg



And the attenuation circuit:

2way Lpad.jpg
So my question is where do I place the resistors for the tweeter? Before or after the capacitor? Before or after the Coil?



Here is the sheet that came with the PCB:

Crossover board.jpg


Thanks in advance for any help, it's really appreciated.

-Rob
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Old 2nd February 2018, 02:11 AM   #2
AllenB is offline AllenB  Australia
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After the coil would be easiest to get to work as expected.
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Old 2nd February 2018, 02:24 AM   #3
Rob41 is offline Rob41  United States
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Quote:
Originally Posted by AllenB View Post
After the coil would be easiest to get to work as expected.
Please see if I got it right. R1 is in yellow and R2 is in red:

Crossover board - 2.jpg
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Old 2nd February 2018, 04:12 AM   #4
Rob41 is offline Rob41  United States
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I modified this in paint. I think this is correct?

Complete Crossover.jpg
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Old 2nd February 2018, 05:18 AM   #5
AllenB is offline AllenB  Australia
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Your schematic looks good but the layout is different. I would have expected the L-pad to be hanging off the board after the tweeter out terminal, unless you rearrange it a little.
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Old 2nd February 2018, 06:28 AM   #6
Rob41 is offline Rob41  United States
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Quote:
Originally Posted by AllenB View Post
Your schematic looks good but the layout is different. I would have expected the L-pad to be hanging off the board after the tweeter out terminal, unless you rearrange it a little.
I think I understand what you're saying. After the tweeter outputs from the crossover board, then add R1 and R2 for the l-pad part? Now that I look at it again, I see my original location for R1 would have had an effect on the coil.

Would this work correctly? (R1 yellow, R2 red):
Crossover board 3.jpg


This is my first crack at building a crossover and schematic-wise it seems a bit more straight forward to me than the actual layout.

Well, I've got about $75 worth of caps, coils and resistors that won't get here for 4 or 5 more days so I've got some time to get this ironed out.
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Last edited by Rob41; 2nd February 2018 at 06:53 AM.
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Old 2nd February 2018, 07:29 AM   #7
Sonce is offline Sonce  Macedonia
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Layout from post #6 is wrong, use layout from post #3, schematic from #4 is OK. However, values in the schematics are questionable. You seem to use driver DC resistance for calculation - that is wrong, driver impedance at 2000 Hz is higher. Also, R1 and R2 wattages are way too high. Which drivers are you using?
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Old 2nd February 2018, 07:35 AM   #8
Sonce is offline Sonce  Macedonia
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Quote:
Originally Posted by AllenB View Post
Your schematic looks good but the layout is different. I would have expected the L-pad to be hanging off the board after the tweeter out terminal, unless you rearrange it a little.
That would be logical, if the L-pad is potentiometer (variable R1 and R2, constant R1+R2). Layout from post #3 is OK for fixed values of R1 and R2.
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Old 2nd February 2018, 07:59 AM   #9
picowallspeaker is offline picowallspeaker  Italy
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I don't see any convenience in making a PCB for the passive components.
Probably it's meant for industrial application, many pieces.
I don't see either any convenience for putting the crossover inside the box
Again, it's meant for selling the box, all inclusive and user-proof.
Why worry ?
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Old 2nd February 2018, 08:12 AM   #10
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by Rob41 View Post
Would this work correctly? (R1 yellow, R2 red):
Almost. Take the positive end of R2 from the terminal and attach it to the loose end of R1. Attach the tweeter there.
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