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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, 02:58 PM   #11
Rob41 is offline Rob41  United States
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Quote:
Originally Posted by picowallspeaker View Post
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 ?
Yes, that's why I'm going that route. It's my first time using passive. I use active in my main systems, but this is for my wife to use so I'm making it plug and play.
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Old 2nd February 2018, 03:31 PM   #12
Rob41 is offline Rob41  United States
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Quote:
Originally Posted by Sonce View Post
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.
Quote:
Originally Posted by AllenB View Post
Almost. Take the positive end of R2 from the terminal and attach it to the loose end of R1. Attach the tweeter there.
Okay, I am not using a potentiometer. I am using fixed value resistors. Let me put what I've got in one post here for clarity.

Below are the correct pics of crossover, attenuation and then both combined:
1.jpg 2.jpg Complete Crossover.jpg

Allen, I finally understand what you're saying. Like in the schematic, R2 has to be placed between + and - terminals after R1. Which would work best?
Crossover board 4.jpg Crossover board 5.jpg

Thanks for your patience.
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Old 2nd February 2018, 10:56 PM   #13
AllenB is offline AllenB  Australia
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They are electrically the same. At speaker frequencies, component layout comes down things like vibration resistance and leads breaking, convenience, heat dissipation.
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Old 3rd February 2018, 05:54 AM   #14
Rob41 is offline Rob41  United States
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Thanks Allen, I appreciate all the help!

-Rob
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Old 3rd February 2018, 09:10 PM   #15
Rob41 is offline Rob41  United States
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Once I get the crossovers built and refurbish the Sansui SF2 speakers, I'll be using a Carver amp to drive them and this little tidbit I just built.

a.jpg c.jpg
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Last edited by Rob41; 3rd February 2018 at 09:32 PM.
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Old 5th February 2018, 09:17 PM   #16
Rob41 is offline Rob41  United States
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Default First crossover completed

The crossover components arrived this afternoon and I was able to assemble my very first passive crossover.

Yesterday I was able to install the new drivers and bring the Sansui SF2 exterior into the 21st century.

One more crossover to go and a bit of mounting work, then I'll be able to hear them for the first time.

c1.jpg c2.jpg IMG_20180205_124335285.jpg
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Old 8th February 2018, 07:02 PM   #17
Rob41 is offline Rob41  United States
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Default Wrapping up

Well, to wrap things up, I got both crossovers done with the attenuation resistors reducing the output of the tweeter by more than 5 db. They sounded awful! The high end was veiled and just seriously lacking.

I removed the resistors for the l-pad portion and it is so much better. Granted, a small reduction in frequencies above 2k would be ideal, I'm using these in my system with a car stereo as the center piece so it's easy enough to use the built in equalizer to reduce the top end a bit.

The SF2's originally had a first order crossover and two 8" mid/bass drivers. Now they have a 2nd order LR with a single up-firing 8" mid/bass driver to integrate with the up firing soft dome tweeter. Both new drivers and the crossovers are a vast improvement over the original configuration. I am very pleased with the outcome.

Thanks for the assist guys and especially Allen.
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