How do you calculate the performance of a High Pass network when it's not really a T or a Pi network?

Okay, so in a balanced line, you can't have a standard T or Pi network, because thats really for a grounded system or unbalanced line. How about a balanced line? I have a filter for a 300 ohm line:
------+--||--+--||--+----
3 3 3
------+--||--+--||--+----

-||- is a cap

+
3
+
is an inductor. All the filter calculators I've been able to find are just for Pi or T networks.

Answer:
I'm no whizz on passive filters, but how about this?

If the line is perfectly balanced, the voltage at the centres of your inductors will always be zero with respect to either side of the line, even though it may be far from zero with respect to earth.

So you could (on paper, not in reality) join the centres of all the inductors together and hey presto! You've got a pair of pi or T networks, each with input half the line input but working in opposite phase. Just subtract their outputs to get the output of the balanced filter.

Or is this too easy?

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How do you calculate the performance of a High Pass network when it's not really a T or a Pi network?

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