The QSP Stereo Power Amplifier is a by-product of the famed Quad 909 Stereo. This product was designed in keeping with the traditional built of QUAD Power Amplifiers, but is right up with the latest technology and the finest audiophile components available. The amplifier with 140W per channel into an 8 ohm load, and plenty more into lower impedance ensures that there is ample power into a wide range of speakers, including the QUAD ESL range.