Introducing: The Pit Vipers (Ooh Yeah!!!)

[9sheng]

I saw the discussion about the L4 coil. I'm still a little confused. I hope to get more answers here. I found 3 options from suppliers and they all have different prices.



I know number 3 is definitely ok. But what's the downside of using No. 2? Can No. 2 meet the design requirements? Because I want to achieve the best results while keeping costs in check. As you all see, I still have a lot to buy.
I've also seen iron core inductors like size 1 used on some projects by others, as Paul.C said, you can choose any type of inductor! The question is, is number 1 ok? If it is used, what is the disadvantage compared to the No. 2 hollow coil?
Although the copper wire of No. 1 in the picture is only 1.2mm, I can also find 1.6mm 5mH iron core inductors, and their internal resistance should also be less than 1Ω.

[fpitas]

Everyone knows, iron cores make your music sound ironic.

[Paul Carmody]

I'm very brand agnostic. Use whatever brand you can get. What matters most is the value, and that its tolerance is within +- 10% (5% is even better)

Also, that's really cool that you did your own PCB.

[Paul Carmody]

I look at it this way;

14AWG air-core = 18AWG steel laminate; usually these are pretty close. You could likely get by with a 16AWG air on the better side of results. I don't prefer to use smaller than 18AWG SL or 16AWG air on woofers if at all possible to keep the DCR low. Outside of that, Paul's recommendation is sound.

Thanks, Wolf.

After thinking about this, I think the 16 AWG air cores will be fine. Those are available various places. The DCR is slightly above 1 Ohm, but in the grand scheme of things, I think it'll work out just fine. In reality, if these were boutique speakers, they'd probably ship them with 16 AWG air cores and gush about how this offers "superior sound quality over shameful iron-core."

[9sheng]

The crossover accessories I used in the last pair of speakers "Classix II", the capacitors used are "BENNIC", I don't know if this brand of capacitors meet the requirements. The PCB circuit board is made by myself (actually I copied someone else's circuit diagram). From this, I learned the PCB design process, and I think I will take another big step forward when I design the PCB next time.

[9sheng]

Serenitynow Are you guys sharing more photos and photos of the crossovers and the originals as you make them? I am also planning to build this great speaker. But I can't start right away, I will have some job changes in the near future, so I will wait 2-3 months before I can start it. So here I am, hoping to see more details on the build process, and learn more.

@Paul Carmody can you share more detailed photos of your crossovers and builds?

[djg]

Available. 5.0MH, 14AWG, .59 ohms DCR, $64.

[rpb]

This is available.
Jantzen Audio 4.7mH 15 AWG P-Core Inductor Crossover Coil

[djg]

Or are you?

[djg]

It's not like you're going to build a pair with substitute coils and then build another pair with the "correct" coils and do a double blind listening test.

[djg]

While you wait for one or two items to be restocked, other items may go out of stock. Again, I'd buy what is available now and the rest as it is restocked. Are you going to be done with the cabinets next week? I definitely don't recommend cutting driver holes and rebates without the drivers in hand. There's a whole lotta work that goes into a DIY speaker. Your coils may be available before you have finished cabs to put them in.

[Wolf]

I look at it this way;

14AWG air-core = 18AWG steel laminate; usually these are pretty close. You could likely get by with a 16AWG air on the better side of results. I don't prefer to use smaller than 18AWG SL or 16AWG air on woofers if at all possible to keep the DCR low. Outside of that, Paul's recommendation is sound.

[Serenitynow]

I understand that and thanks for your reply. But, what is the fulcrum regarding DCR in this application? I' ve seen anywhere from .3 to 3.0 DCR in Iron-cores and Air-Cores.
I don't know where the cutoff line vs. performance in this situation falls.

I would think trying to get to the same DCR as suggested in the BOM would be best. But Air-Cores don't seem to go as low as Iron-Cores.

Hence my delima.

[Geoff Millar]

Due to the low value of the $A compared to the US, it might (might) be worth looking at ordering from Oz, but if I were you I'd take Paul's advice on what to use.

Geoff

[Wolf]

It is currently hard to get the steel-lam cores for those kinds of coils. This is why they are few and far between.

Wolf