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Anyone using these for crossovers?  

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Lindelium18
(@lindelium18)
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08/01/2020 8:01 pm  

I saw these copper plates out at Parts Express and thought they might work well for crossovers...  I used a Dremel cutoff wheel to score the copper.  Seems to work so far but I just finished them tonight.

03E7C32E 7B75 47CC BD28 00F2291785AE
995EFF89 C1EA 40EE 8B4E 5C90AC8AEF99

 


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123Toid
(@123toid)
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09/01/2020 9:59 pm  

Those look awesome.  I personally haven't used them.  I am curious the affects it might have on the inductors though.  I would think that copper board might have an effect on them.  You have dats now, you could test it. 


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Lindelium18
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09/01/2020 10:42 pm  

@123toid

That’s a good point. How would you test it?  Just hook the leads up to each inductor in circuit?


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123Toid
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09/01/2020 10:49 pm  

@lindelium18

Yes sir. Just make sure no amplifier is hooked up. Then test the inductance.


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Lindelium18
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12/01/2020 11:53 am  

@123toid

Well, 3 crossovers inductors all checked out fine. However, the fourth one, each inductor seemed to be about half. I’m assuming it is because of the way they are hooked up though, not because of the copper panel; since the other three, even the other one with more than one inductor, all checked out fine. This is the one that is measuring off:

3E2ABE9F 04BC 402F BA14 D6FB0178EAFB

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123Toid
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13/01/2020 2:22 am  

That is weird.  Did you make sure you were making solid contact with the part that was scratched off?  


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Lindelium18
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13/01/2020 6:36 am  

@123toid

Yep. Tried it a couple times too. 


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123Toid
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14/01/2020 4:54 am  

@lindelium18

It's possible they were sent wrong.  I would encourage testing it with dats before you wire it.  I would say though, you should check your inductor layout to make sure you don't get crosstalk when it is complete.  Here is a good resource for that.

Inductor placement

 


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TVOR-Ceasar
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14/01/2020 9:27 am  

Only thing I can see is that the 2 solder joints where the coils land on the same copper pad look like they should be re-flowed to eliminate their effects.

Did you clean / ScotchBrite the boards before soldering? This removes any impurities (oils, oxidation, etc.) to ensure the best possible solder joint. Just trying to eliminate that from the equation.

You should be able to measure each component by themselves, as long as you have a meter that can read capacitance and low resistance ( 1 ohm \ under ), using the data supplied. If they check out, then check you have everything laid out correctly and that there are no shorts between the copper pads. After that...

Are you connecting them to the wrong impedance driver? That'll throw off the crossover points and any other compensation designed into the network.

Just my thoughts on what "may" have an affect. If none of those apply, well...???

-Charlie


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Lindelium18
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14/01/2020 9:53 am  

@tvor-ceasar

I will most likely be rotating (resoldering) the lower left inductor since its orientation may be an issue.  When I desolder it, I’ll measure it out of circuit and see what I get. Then I’ll rotate it and try again. All the copper plates were cleaned prior to solder so I don’t think that is the issue. I’m using DATS V3 to measure everything and all the other boards were measuring fine so I think I’m good there. Lastly, I haven’t put them on any drivers yet while attached to the boards so driver impedance is not an issue yet. I hooked them all up with alligator clips etc...and it seemed to work great. 


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Lindelium18
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21/01/2020 1:35 pm  

Ok, updated report. I hooked these all up and despite measuring weird, they work as expected!  However, one of the “fun” things about diy speakers is I’ve decided to completely change the enclosure design. I’m not happy with the “peaky” response of the ported design so I’m going sealed. This allows me to make the enclosure smaller as well. Back to the drawing board!

D5213BBD 9FCE 4751 A191 8095A94EA583
83A53F0F AE76 4B59 8675 6366B7C3F394

 


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123Toid
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22/01/2020 12:20 am  

@lindelium18

Funny that you say that.  I am in the process of changing an enclosure I just built.  It works, but I really want to reduce some unexpected port noise.  You never can tell what you will run into, until you run into it.  I'm looking forward tot he new redesign. 


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Lindelium18
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22/01/2020 10:51 am  

@123toid

Yeah, I’m just not happy with this sub in a ported setup. I think sealed is going to perform a lot smoother and while I’ll “lose” 3dB at 40hz, just about everywhere else it’s the same or better.  Plus, I’ll be going from 1.25 cu ft down to about 0.75 cu ft so that’ll be a more appropriate size box I think too. 


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