Efficient way to power stacked rows of pistons?

How can I power two vertically stacked rows of pistons, hopefully with a minimal number of repeaters? I can get the bottom row powered with just a line of redstone on the gold blocks behind as shown, but can't figure out how to do something similar for the top row at the same time.

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2 Answers

You can actually save on the redstone torches and just raise your "golden block with redstone" line by one block.

The result is this:

If you don't care about inverting the signal beforehand, simply use redstone torches behind the upper pistons to power everything:

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