What's the Second coil do?

[Craftyservant]

Greetings all, I have been browsing the boards for a while and have learned an incredible amount of stuff. Now I have a question that I'm sure somebody here can answer.

I purchased a Xover from Partsexpress, (the cheapo unit), and although it does what I want, (tweeter is just a little brighter than I like), I am having trouble wrapping my tiny brain around the reason for the 2nd coil. It's in the same circuit (sort of) as the Cap but I'm not sure if it is actually needed or why it's in the circuit. See attached pic
Thanks ahead of time.

Music is art, Audio is engineering

[Craftyservant]

Might help if I post the pic of the backside also.

[Dr.EM]

With what appears like 2 coils and one cap, and with this being a 2 way crossover, I can only assume it employs assymetrical slopes. Most likely 6db woofer and 12db tweeter slopes. If it were one of each it'd be 6db for both.

EDIT: Having now seen the back I'm fairly certain that's right. 12dB tweeter slope and 6dB woofer slope

[Cal Weldon]

The woofer appears to have a 6dB roll off whereas the tweeter uses a 12db. The second coil is used to bypass the tweeter and better protect it.


EDIT: The good Dr. answered whilst I was a typin'

[5th element]

Originally posted by Dr.EM
With what appears like 2 coils and one cap, and with this being a 2 way crossover, I can only assume it employs assymetrical slopes. Most likely 6db woofer and 12db tweeter slopes. If it were one of each it'd be 6db for both.

Indeed, it looks like a 1st order on the woofer and 2nd on the tweeter.

[Cal Weldon]

That's a record. 3 answers in two minutes, AND they're all the same!

[Craftyservant]

EDIT: The good Dr. answered whilst I was a typin' [/B]

Originally posted by Cal Weldon
That's a record. 3 answers in two minutes, AND they're all the same!

I didn't expect such fast responses. Thanks everyone! It makes since now. Fascinating stuff.

[badman]

Originally posted by Craftyservant





I didn't expect such fast responses. Thanks everyone! It makes since now. Fascinating stuff.

Feel the love. Now, don't be a stranger! There are a lot of great people here and an amazing amount of group knowledge, though on the finer points, there's often disagreement (audibility of enclosures anyone? EnAbl?)

If I'd known about this place sooner, my early designs would have been better. First speakers I built, "edge diffraction whaaa?"

[Cal Weldon]

Originally posted by badman


Feel the love.

Well said. Without this place, I'd think baffle step compensation involved time alignment of the drivers.

[Craftyservant]

There are a lot of great people here and an amazing amount of group knowledge, though on the finer points, there's often disagreement (audibility of enclosures anyone? EnAbl?)


Yes I agree. It seems the greatest variables are opinions. I've found it best to read carefully, listen closely, and do the math. The greatest reward is to come back here and give away the knowledge gained. (oh... and end up with some great sounding speakers also)

Thanks again.