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Upgrading AL Crossovers


rtaylor

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Hey John,

That is an interesting schematic. Can you tell us what years it was used?

It looks to me that the mid is a first order with a zobel. I did some quick calculations and concluded it is effective at about 1200 Hz. The resistor makes the Q rather broad. I can only imagine it is cutting down on response of the mid a half octave on either side. I've not done a simulation. I makes me wonder whether the Klipsch people thought the mid was too loud in that range.

The bass has a zobel too. That seems to take effect at 600 Hz. Again, I expect it is because of some issue in that range.

Best,

Gil

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Hi Gil,

I just noticed your question. The Type AL was used begining in 1982 when the K-55-M was first used. It was used in the La Scala for several years, but I'm not sure how many. I have never hears of a Type AL-2, so I believe it was used until the 90s when the AK-3 and AL-3 were issued. Since those 2 are so similar, I think AL-2 may have been skipped.

The Type AL has a howl-ly sound around 300 Hz and something that makes it indistinct, probably ringing. Dynamat did not help my '87s much. Little brother has them now with the crossover we designed and they sound very nice in his room. I'm not a country music fan, but Trisha Yearwood has a beautiful voice and his system does it full justice.

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