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AR-10Pi crossover schematic from AR original Drawing sheet


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 Here is the AR 10 Pi schematic coming from a copy of an AR original drawing sheet. Unfortunately the copy I have is not complete and a part of the AR drawing sheet is missing.
I couldn't find this schematic in the "AR Drawings" section, so I hope it can be added to the other files somewhere in the Library in order to allow everybody to see it. I think it's a rather rare document even if, unfortunately, not complete.
I have scanned it as TIFF format then I've converted it to JPEG to insert it directly into this post. To get a higher resolution, save the attached file in Tiff format.

Differently from LST, in the AR 10 Pi the auto-transformer and the 3 dB step switches permitted the listener to have more flexibility with a total of 27 different combinations of driver output level (that is 27 different frequency responses) without using any attenuation resistor. The auto-transformer enabled the user to control bass output by a 3 step switch as well. Differently from midrange and tweeter, the woofer switch (Woofer Environmental Control switch) is actually not a 3 position +/-3dB step switch but a 0dB (4Pi), -5dB (2Pi) and -8dB (Pi) switch.

Luigi

PS: I had already posted this schematic in the Acoustic Research forum pages but I think that the most appropriate place is probably here.

AR10 Pi original schematic JPEG.jpg

AR10 Pi original schematic TIFF.tif

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  • 3 years later...
7 hours ago, menchs said:

I am looking to replace my crossover capacitors after 40 or so years. Do you, or anybody else on the forum know the voltage requirements of the crossover capacitors?

Will appreciate your help...

menchs

The general rule is to replace capacitors with ones having the same or greater voltage rating of the original caps. Since modern caps generally have higher voltage ratings than older caps, that is not hard to do. For speaker crossovers, any capacitor with a voltage rating of 100 V or greater will be fine.

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  • 5 months later...
On 7/23/2017 at 1:54 PM, fedeleluigi said:

 Here is the AR 10 Pi schematic coming from a copy of an AR original drawing sheet. Unfortunately the copy I have is not complete and a part of the AR drawing sheet is missing.
I couldn't find this schematic in the "AR Drawings" section, so I hope it can be added to the other files somewhere in the Library in order to allow everybody to see it. I think it's a rather rare document even if, unfortunately, not complete.
I have scanned it as TIFF format then I've converted it to JPEG to insert it directly into this post. To get a higher resolution, save the attached file in Tiff format.

Differently from LST, in the AR 10 Pi the auto-transformer and the 3 dB step switches permitted the listener to have more flexibility with a total of 27 different combinations of driver output level (that is 27 different frequency responses) without using any attenuation resistor. The auto-transformer enabled the user to control bass output by a 3 step switch as well. Differently from midrange and tweeter, the woofer switch (Woofer Environmental Control switch) is actually not a 3 position +/-3dB step switch but a 0dB (4Pi), -5dB (2Pi) and -8dB (Pi) switch.

Luigi

PS: I had already posted this schematic in the Acoustic Research forum pages but I think that the most appropriate place is probably here.

AR10 Pi original schematic JPEG.jpg

AR10 Pi original schematic TIFF.tif 2.78 MB · 24 downloads

Thank you so very much for the schematic I've looked everywhere you are the man

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