These Castle Acoustics speakers deliver quality sound and a versatile design that allows for integration and stereo and surround sound systems. The Castle Acoustics Kendal main/stereo speakers measure 20 cm wide by 24.5 cm deep by 73 cm high. The cabinets weigh approximately 9 kg each, allowing users to easily adjust their positioning to achieve optimal sound. These Castle Acoustics speakers are capable of handling between 25 watts and 100 watts of RMS power. Users intending to hook the Castle Acoustics Kendal main/stereo speakers to an amplifier should ensure that the amplifier can overcome their 8-Ohm impedance to maintain audio quality and prevent potential damage to the speakers. The 87 dB sensitivity allows these main/stereo speakers to achieve decent sound levels before any noticeable audio distortion can begin. The frequency response range of these Castle Acoustics speakers extends from 50 Hz to 20 kHz. This covers much of the human hearing range to ensure listeners hardly miss a beat from their favourite music.