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La Scala autoformer with multi tap connections?


stanley chu

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In upgrading the crossover (AL-3 type) of my La Scala I find it most desirable that the T4A autoformer can be replaced by a autoformer with multiple tap connections so as I can adjust the squawker level to suit different tastes. I would like to reduce the squawker output level just a little but don't want to use resistors.

Al's ALK crossover is having a UTC #3619 autoformer with multiple tap connections. I don't know if this can be a direct drop in replacement of the T4A.

I wonder if other La Scala users with AL-3 crossover will have this need as well? And if so can we have enough demand to have it specially made? Any Ideas? Al?

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Stanley,

I have never had a chance to measure the tap position on any of the Klipsch

autoformers except the T2A. I have a hunch that the T4 is simply a T2A with

the unused taps removed to reduce cost. Why else would a single tap be marked

"3"? Besides, tap 3 on the T2A is the right one for the K55M squawker. All

this leads me to believe that the #3619 from Universal Transformer will work

in the AL-3 perfectly. There's no guarantees though.

It is possible to make fine adjustments to the ratios using the extra "x" tap

on the #3619 by "floating" the ground return of the squawker and the 5 mHy

inductor connected across it (AL-3) and connecting the common connection to a

different tap than "0". This allows all sorts of possibilities.

For example:

connect, turns ratio, -dB

x-3, .3234, -9.8 dB

0-2, .3548, -9.0

1-4, .4567, -6.8

0-3, .5012, -6.0

x-4, .5301, -5.5

2-5, .6452, -3.8

NOTE: This table does NOT apply to my network, only the Klipsch networks.

Al K.

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