dB        R1        R2         C1
====================================
6dB     12 ohm    30 ohm      0.47uF
8dB     12 ohm    20 ohm      0.47uF
10dB    16 ohm    16 ohm      0.47uF
12dB    25 ohm    16 ohm      0.47uF
14dB    30 ohm    14 ohm      0.33uF
16dB    40 ohm    12 ohm      0.33uF
18dB    50 ohm    12 ohm      0.22uF
20dB    75 ohm    12 ohm      0.22uF
====================================

Thanks

Rich

Thanks,
Mike Borzcik

However, if your tweeter is not a compression driver, or if it is but is mounted on a horn that has collapsing directivity, then this crossover arrangement may not be right for you. It's perfect for Pi's and speakers like them, but no single crossover is right for all loudspeaker configurations.

Out of curiosity, is there anything that uses more than 10-12dB attenuation?

One benefit from using step-down transformers is they transform the energy rather than dissipating it, so they don't get as hot when current is high. On the other hand, I don't expect the Klipsch transformers are made to take a whole lot of power, so this might be a mute point. However, another aspect of this is the impedance transformation which effectively increases tweeter damping when a step-down transformer is used to lower the drive voltage to a tweeter. The output coil from the step-down transformer has lower impedance and is therefore a better current sink, providing better damping. Here again though, I'm not sure this is very relevant in practice because tweeters do not require a lot of electrical damping, particularly compression horns which are extremely well damped acoustically.

Note that if you're building from the plans, you won't need this chart. Use the values specified in the plans. The chart is for people that are doing their own thing, and gives them a place to start.

They are my choice because you can further compensate
for room conditions and peircing headaches.