Wire gauge for crossover coils OA-12/OA-14

För er som vill modda och renovera på egen hand.
For those of you who whish to mod and renovate by yourself.
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arb
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Joined: Fri 22 Oct 2010, 12:36

Wire gauge for crossover coils OA-12/OA-14

Post by arb »

Hello,
In the process of scratch building the revised crossovers (for B65oa II and T22-oa), I found the following infos on the forum: the 0.4mH coil wire is specified at 1.2mm diameter, the 0.6mH coil wire at 1.0mm dia (the original 0.5mH coil wire being 0.7-0.8mm dia).
What about the 1.8mH coil? I could not find any specific recommendations. Original wire dia is 0.7-0.8mm: should it just be kept as is, or be increased with the new woofer? If power input is increased, that's a lot of heat potentially generated otherwise...
Thanks for your inputs!
ARB
Presidenten
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Joined: Thu 03 Feb 2005, 10:50
Location: Umeå

Re: Wire gauge for crossover coils OA-12/OA-14

Post by Presidenten »

Hello,

I belive that you do not need to change the 1,8mH coil. Not nessecary.

Greatings

from Pres.
arb
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Posts: 5
Joined: Fri 22 Oct 2010, 12:36

Re: Wire gauge for crossover coils OA-12/OA-14

Post by arb »

Thank you!
I was aware that most people were keeping the old coil, but I was wondering if it was indeed the optimal solution when a full rebuild is contemplated.
While the original crossover was designed to handle about 40Wrms, with a LF coil DC resistance exceeding 1ohm (that's about 5W dissipation), both the B65oa II woofer and the T22-oa tweeters can comfortably handle more power: this fact seems to be reflected in the increased wire diameter specified for the new HF coils (1 or 1.2mm dia) but not for the LF coil...
I am also aware that total DC resistance plays a role in the ultimate slope and shape of the filter LP curve, so I was just trying to understand what trade-offs are being made and how much leaveway there is.
I apologize for writing in English, but my written Swedish skills are nil: I can read some though, so, for you folks having more information, please, feel free to write in Swedish... I think I'll be able to get most of it...
Mvh,
ARB
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