In this paper, we present the experimental results of the comprehensive study of the microstructural features and complex dielectric, elastic and electromechanical properties of the ferroelectrically “hard” piezoceramics based on the lead zirconate titanate (PZT) composition. For the measurements and analysis of the real and imaginary parts of the complex parameters of the studied piezoceramics as well as their frequency dependences, we used precision impedance analyzer Agilent 4294A and Piezoelectric Resonance Analysis Program (PRAP) software. We have found that the studied piezoceramics demonstrate a unique combination of dielectric, elastic and electromechanical parameters along with very low elastic and electromechanical losses and dispersion over a wide frequency range and can be used in various high-power ultrasonic applications.