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Old 4th December 2007, 04:07 PM   #1
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Default Adire 281 crossover schematic?

Hello all,

I bought a pair of Adire 281's a couple years ago and then had a couple kids so time has been a precious commodity At any rate, I'm in the process of building them now and have been able to find the cabinet plans, but not the crossover schematic. I remember reading on here a lot when I was considering the 281's and there were quite a few 281 builders at the time. I was hoping someone kept an electronic copy of the schematic????

Thanks in advance,

Russell
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Old 4th December 2007, 05:27 PM   #2
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I think I have a paper copy in the workshop. I always wanted to build a set of those and go figure. Their out of business now.
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Old 4th December 2007, 05:27 PM   #3
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I may have something archived. I'll take a look and let you know.
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Old 4th December 2007, 08:51 PM   #4
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Thanks all,

I actually just received a reply from Adire. I had sent them an email a few days ago and they sent the crossover schematic to me about an hour after I posted

I do have a question about it though. As I recall there was a tweeter polarity issue early on. The schematic shows the tweeter wired out of polarity (+ amp to - tweet). Does that seem right?

I'm going to try to attach the pdf.

Thanks,

Russell
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File Type: zip kit281plans[1].zip (91.2 KB, 39 views)
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Old 4th December 2007, 09:57 PM   #5
DcibeL is offline DcibeL  Canada
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Yes, the polarity is correct. Wire your speakers as per the drawing.

The woofer has a 2nd order filter, and the tweeter has a 4th order filter. The 2nd order filter will have a 180 degree phase shift, and the 4th order will have a 360 degree phase shift. So the tweeter is wired backwards for phase alignment.
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Old 5th December 2007, 10:49 AM   #6
sreten is offline sreten  United Kingdom
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Hi,

I've no idea what 1.2R and 3.6uF is doing wired across the tweeter,
all I can say it is an extremely poor load at high frequencies and IMO
will lead to expiry (depending on its protection) of some amplifiers.

/sreten.
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Old 5th December 2007, 02:18 PM   #7
DcibeL is offline DcibeL  Canada
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You mean the 1.3R and the 33.6uF? Looks like a Zobel to me, though I haven't done any simulations to see just how it affects impedance.
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Old 5th December 2007, 03:04 PM   #8
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by DcibeL
You mean the 1.3R and the 33.6uF? Looks like a Zobel to me,
though I haven't done any simulations to see just how it affects impedance.

Hi,

Its C3 and 3.6uF I assume. 33.6uF capacitors do not exist
so it is a nonsense value and if taken literally would quickly
be terminal for most amplifiers. 1.3R is too low for a zobel.

/sreten.
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