Ron is correct. Better than just a cap would be this unit from PE
Crossover High-Pass 8 Ohm 3,000 Hz 100W 260-174
Replace the cap though- electrolytics are awful, even a cheap 3 dollar polyester or polypropylene cap is better
Dayton Audio DMPC-4.7 4.7uF 250V Polypropylene Capacitor 027-422.
A good beginner site for DIY, car stereo oriented but the physics are the same.
Passive Crossover Networks
The reason I suggest using the 12 dB/octave instead of a cap which is only 6 dB/octave, the Vifa is slightly horn loaded. The Vifa has about 6 dB more in the 10-20K octave than the original tweet, they sound much more "open".
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