Piezo 3 3/4
This hard to find Piezo ribbon tweeter is a 2 5/8"x 3 3/4" rectangular ceramic drive wide-dispersion piezo tweeter. The specifications are: 60 watts RMS, frequency range: 3,500-30,000Hz, 96 dB @ 1W/1M, piezo tweeters do not have a nominal impedance.
Cut out 1 1/8"x 3 1/2"