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Old 26th December 2012, 03:10 PM   #31
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Quote:
Originally Posted by Pano View Post
Are you using this fro L1 or L2? See the DCR of the coils in your project.
You can find what you want in either Jantzen or Solen to match the DCR.
ill be using two coil per speakers, was that your question?
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Old 26th December 2012, 06:02 PM   #32
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The design calls for a L1 of 0.43mH and 0.6 Ohm, and a L2 of 0.5mH and 0.2 Ohm. Using a coil of 0.47mH for both L1 and L2 means an error of up to 10%, more than I would do. From the Solen catalog you can find a 0.43mH coil (0.44 Ohm - 20AWG), and a 0.51mH coil (0.22 Ohm - 16AWG), that are a good match with the design.
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(Disclaimer: I'm not affiliated to Solen in any way)
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Old 26th December 2012, 06:05 PM   #33
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I was looking at the 3-way crossover you linked to. It uses 4 inductors per channel. Was just wondering where you were putting this one. L1 (tweeter) or L2 (mid series)?
Or are you doing something else?
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Old 26th December 2012, 06:20 PM   #34
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wow, I though I could get away with two 0.47, thanks... Solen is too expensive when I can get 5$ inductors with almost the same spec. music is not to be played loud... what do you think if I go with jantzen.
so, for
L1: Jantzen 0.44mH 18 AWG Air Core Inductor 255-226
L2: Jantzen 0.50mH 18 AWG Air Core Inductor 255-230

Pano, I'm going active in the bass, so only need crossover for the upper speaker.
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Old 26th December 2012, 06:41 PM   #35
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Get the 0.5 for 0.47 mH and use as is, or unwind it a bit. Jantzen is good stuff.
When I looked at Solen, they were the same price. Am I wrong?

You are doing just the tweeter, or tweeter and mid?
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Old 26th December 2012, 10:37 PM   #36
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Quote:
Originally Posted by Pano View Post
Get the 0.5 for 0.47 mH and use as is, or unwind it a bit. Jantzen is good stuff.
When I looked at Solen, they were the same price. Am I wrong?

You are doing just the tweeter, or tweeter and mid?
The crossover is just for the low pass on the mid and highpass for the tweeter. My high pass on the mid is in my preamp and the bass is active.

Why shouldnt I take the exact inductor I need instead of having to unwind the inductors...

Can anyone tell me if the inductors I just propose would be the closest that I need for my project?
L1: Jantzen 0.44mH 18 AWG Air Core Inductor 255-226
L2: Jantzen 0.50mH 18 AWG Air Core Inductor 255-230
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Old 26th December 2012, 11:08 PM   #37
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Thanks for the clarification.

The values you show will be right for the parts you want to build.
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Old 27th December 2012, 10:55 AM   #38
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Quote:
The crossover is just for the low pass on the mid and highpass for the tweeter. My high pass on the mid is in my preamp and the bass is active.
Be aware that it is difficult to replicate actively a passive design(*), you need at least the transfer functions (low pass for woofer and high pass for mid).

Ralf

(*) If the passive design is done properly, i.e. not using merely textbook formulas.
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Old 27th December 2012, 02:57 PM   #39
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That's a good point, and it's certainly worth a bit of investigation of the driver impedance to figure out what the passive crossover is really doing. That does not mean you have to duplicate it, but it's wise to at least know what someone else found that works well.
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Old 28th December 2012, 01:24 AM   #40
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Good point giralfino/Pano. The "low pass on the mid driver" was devised with the "high pass on the mid" component and cannot be separated without affecting the response. You need new crossovers. (Or to validate/test and measure or simulate the new passive "low pass on the mid driver")
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