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Multi-Way Conventional loudspeakers with crossovers

3 Legged Inductors
3 Legged Inductors
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Old 15th May 2013, 04:27 PM   #1
istari knight is offline istari knight  United Kingdom
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Default 3 Legged Inductors

Anyone seen one before ? I've got some old Mordaunt-Short Pageant II's & intend to upgrade every part of the crossovers but this inductor has me stumped

Click the image to open in full size.

I haven't measured it yet but I'm guessing it may be 2 in 1 or something like that ? I'll update with measurements later...
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Old 15th May 2013, 05:08 PM   #2
mondogenerator is offline mondogenerator  England
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ive seen similar but in power supplies. Id wager its centre tapped, or maybe offset centre tapped. You could likely do similar with 2 inductors of the right value. Either that or its making use of mutual inductance, but i think thats less likely with 3 wires (no electrical isolation)
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Old 15th May 2013, 05:56 PM   #3
Zeta4 is offline Zeta4  United Kingdom
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I think it could be an autotransformer to adjust the treble level.
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Old 15th May 2013, 06:06 PM   #4
mondogenerator is offline mondogenerator  England
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Quote:
Originally Posted by Zeta4 View Post
I think it could be an autotransformer to adjust the treble level.
Or it could be that.
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Old 15th May 2013, 09:56 PM   #5
istari knight is offline istari knight  United Kingdom
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Thanks for the input chaps but I think you were right with "offset center tapped."

I neglected to mention these speakers have 2 x SPDT switches in each crossover as can be seen here:

Click the image to open in full size.

The switch in the tweeter section adds an extra 4R7 resistor & the switch in the bass section changes the inductors tap from 1mh to 1.6mh.

I haven't got the skills to reflect this in a diagram so have done 2, the first with switches in flat position & the second with switches in cut position.

Click the image to open in full size.

Click the image to open in full size.

I do hope that makes sense!
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Old 16th May 2013, 06:31 AM   #6
mondogenerator is offline mondogenerator  England
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Quote:
Originally Posted by istari knight View Post
Thanks for the input chaps but I think you were right with "offset center tapped."
Well well well! Every so often I get something right What is a bit peculiar is C1 and C2 in series, would a single 2.2uF really have been a compromise too far?
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Old 16th May 2013, 09:36 AM   #7
davidsrsb is offline davidsrsb  Malaysia
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Using polarised parts back to back to save money?
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Old 16th May 2013, 10:24 AM   #8
istari knight is offline istari knight  United Kingdom
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Using polarised parts back to back to save money?
All original caps were Elcap Non Polar "low loss" types.

It is rather odd, I had to double check that I hadn't got it wrong but that's how it is...
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Old 16th May 2013, 01:36 PM   #9
mondogenerator is offline mondogenerator  England
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maybe the extra series resistance of 2 5uf worked better than a single 2.5 or 2.2uF?
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Old 16th May 2013, 02:34 PM   #10
Inductor is offline Inductor  Portugal
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Quote:
Originally Posted by mondogenerator View Post
Well well well! Every so often I get something right What is a bit peculiar is C1 and C2 in series, would a single 2.2uF really have been a compromise too far?
It's possible that it's a 3rd.order, like another member in another forum stated.
It then makes perfect sense for a ~3.5KHz crossover.
http://www.lencoheaven.net/forum/ind...topic=12292.45

istari knight, doesn't the cable you are using very bad, or did you upgraded already?!
Use this type of cable (professional Speakon type) if nothing else. You can achieve a good improvement in total quality. It's not expensive (1x ten meter run can give you two cables), gauge/quality and it's adapted to all situations (black heavy PVC jacket or clear zip-cord jacket for audiophile applications). You don't need the bulky connectors, so, can save for later use or sell as parts.
http://www.radialeng.com/rcs/pdfs/radcat-speaker.pdf
Speakon Heavy Duty Speaker Leads : PA Speaker Cables : Maplin Electronics
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