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Request for Help to Understand the Kenwood KA-4000 High Pass Section
Request for Help to Understand the Kenwood KA-4000 High Pass Section
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Old 14th February 2018, 04:35 PM   #1
eschenborn is offline eschenborn  Germany
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Join Date: Oct 2015
Default Request for Help to Understand the Kenwood KA-4000 amplifier High Pass Section

Good evening,

I have been pondering the 40Hz HP section (see pic) of this 1969 Kenwood amp for a good while and cannot make sense of how it works. (I am no EE, and still at the beginning of audio learning). Therefore I would like to ask for some help in understanding the schematic.

Is the HP always in or is it switchable? The switch depicted in the schematics is for a 80Hz HP, however. In any case I can't figure how the RC network works. Which Cs and which Rs from the schematics are implied?

To me it seems that the HP section of the KA-4000 is always in the circuit. A very similar HP section is in the KA-6000, albeit with an additional switchable 40Hz filter. The KA-6004 does have two seperate modules for low pass and high pass.

I will be grateful for some clarification! Thanks in advance.
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Last edited by eschenborn; 15th February 2018 at 07:28 PM.
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