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Crossover inductor for 2 Pi [message #93314] Fri, 12 March 2021 15:32 Go to next message
ade1 is currently offline  ade1
Messages: 3
Registered: March 2021
Esquire
Hi all,
After months of searching for a DIY (or affordable) speaker with decent sensitivity (91dB+ spl) I have finally settled on the 2Pi bookshelf. The towers are a bit too large for my small room.

Any help with crossover components would be great. I'd like to get decent components but at an affordable price. Eg, I think the 10 uf Obbligato Gold caps are good enough at £25 each, rather than Mundorfs at double the price. I have used them before and they were fine. Also, am in the UK, so they have to be available on hificollective or other uk audio DIY sites.

I have no idea about the thickness/gauge of the copper wire in the inductor (0.5mH).

Also, what have people used for sound absorption/damping the cabinet.
Any opinions or advise on any aspects of the build will be greatly appreciated
Cheers,
Ade
Re: Crossover inductor for 2 Pi [message #93315 is a reply to message #93314] Fri, 12 March 2021 16:37 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18031
Registered: January 2001
Illuminati (33rd Degree)

Our kits use 18gu Jantzen air-core coils and Solen polypropylene caps.

I would suggest using air-core coils or at least that wire size and poly caps. I'm not as concerned about brand as I am technology. Poly caps and air-core coils work great.

As for damping material, I really like good-old R13 fiberglass insulation.
Re: Crossover inductor for 2 Pi [message #93316 is a reply to message #93315] Fri, 12 March 2021 17:51 Go to previous messageGo to next message
ade1 is currently offline  ade1
Messages: 3
Registered: March 2021
Esquire
Hi Wayne,
What about resistors? There's so many to choose from and I don't know exactly what to look for. I know it has to be 16 ohms, but what about the wattage and type - I read that metal oxide are suitable.

Am such a newbie - appreciate the support.

Ade
Re: Crossover inductor for 2 Pi [message #93317 is a reply to message #93316] Sat, 13 March 2021 08:11 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18031
Registered: January 2001
Illuminati (33rd Degree)

We use Xicon or Mills non-inductive 10-watt resistors.
Re: Crossover inductor for 2 Pi [message #93319 is a reply to message #93317] Sat, 13 March 2021 18:06 Go to previous messageGo to next message
ade1 is currently offline  ade1
Messages: 3
Registered: March 2021
Esquire
Hi Wayne,
I've looked for 16 ohm Mills resistors, they don't seem to do a 10 w, just 5w or 12w. Shall I go for the 12 Watt?

Alsofound the Xicon, they are only £0.70, each compared to the £5 Mills. I've read good things about the Mills and don't mind paying the extra. It's peanuts compared to some esoteric brands at £25+. Also, it seems a lot of companies don't make 16 ohm resistors, 15 & 18 ohms, but not 16. Does 1 Ohm make a much of a difference?

And the AWG18 Air core inductors range from 0.016mH to 18mH. Which is correct for the xo?

Thanks
Ade
Re: Crossover inductor for 2 Pi [message #93320 is a reply to message #93319] Sat, 13 March 2021 19:55 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18031
Registered: January 2001
Illuminati (33rd Degree)

When using Xicom, get the 10-watt 16Ω part. When using Mills, get the 12-watt 15Ω part.

For the coil, get a 0.5mH part.
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