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A variable stereo blend circuit?

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cvanc:
Hi all-

I have an interesting problem with recent changes to my home system.  Some recordings actually seem too stereo.  I think a variable stereo separation control would be very useful.

I would like a continuously variable knob that goes between full stereo & full mono.  This control was common on old preamps, FWIW.  A good example is the Apt Holman which is highly regarded; photo attached.

I'd like to build one passively if possible.  It'll probably be lossy but my preamp has a ton of output and can afford to spare some dBs.

So... how do I make a passive variable separation control?

jiarui:
Just buy a small mixer.  You only need two channels.  Plug the left and right into the two channels. You can then just use the pan control to do what you need.

Zero999:
This is the simplest I could come up with. R2 will need to have an exponential curve, as it will have little effect towards the high end of its setting. A taper potentiometer could be used, but it'll have to be wired backwards.

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