The Quad ESL-2805 is a floor-standing dipole style of speaker that uses multiple electrostatic drive ultra-low mass (0.5 gm) tensioned film membranes. The Quad stereo speakers are made of heavy-duty composite aluminium and steel. Sensitivity for the main speakers is 86 dB with an impedance of 8 Ohms. The impedance variation for this unit is 4 Ohms to 15 Ohms. The minimum frequency response for the home stereo speakers is 37 Hz. The Quad ESL-2805 speakers have a maximum frequency response of 21 kHz. Power required for proper functioning of the Quad stereo speakers is 10 watts with a peak handling power of 55 watts and an undistorted peak output of 40 watts. Distortion at various output levels can vary from 0.15 percent up to 1 percent. The home stereo speakers measure 10.4 cm high b7 69.5 cm wide by 38.5 cm deep. The Quad stereo speakers weigh 34.8 kg. The speakers can be used as part of a larger home stereo system or a surround sound system, or they can be used as standalone speakers.