Depends on which network you have. The cap value would about double with a 6 db network. A or AA.
I'm sure the impenance isn't exactly half, but that would ballpark it If youhave a K-55 to reference against, just put the 1824 on one side, and adjust cap and autoformer taps to match , playing the mids only.. I'll try to dig out my old settings and see what I came up with, it's been several years. I've always used resistor networks for attenuation, however.