These were originally designed to fit within a soffit for UREI 813 monitors, so if you are looking for a monern retrofit, here's your golden opportunity! These one-of-a-kind main monitors came out of Quad Recording Studios in NYC, and have had MANY hits recorded and mixed through them. Own a piece of recording history! Flagship of the Custom series, the M4+ has been designed as a totally no-compromise, high quality, high power loudspeaker system for use in the largest recording studio music monitoring applications to complement the superb acoustics of the finest control rooms. It is capable of providing accurate low-distortion monitoring at all power levels, maintaining exceptional quality under all drive conditions and delivering the highest dynamic range. All the drive units in this four way system have been especially developed with exactly matching characteristics to provide a perfectly integrated sound source. The bass section consists of four massive 300mm low distortion drivers, each of which has a ferro-fluid cooled 100mm diameter aluminium hexagonal section coil (hexacoil) with an internal vented long- throw magnet system all housed in a low reflecting cast chassis. The mid-range section consists of two ultra high quality 170mm piston drive units each incorporating a massive 75mm diameter aluminium hexacoil, neodymium magnet, and low reflection chassis. The upper mid-range driver is the superb ESOTAR M560 incorporating a 54mm diameter hexacoil coupled to the critically-doped fabric dome ensuring low distortion and excellent transient response. The HF unit is the high powered version of the ESOTAR T330 designed to reproduce stunning distortion-free transients of up to 1000 watts. Both of the Esotar drivers are custom made by Dynaudio for Munro Associates and utilise massive double magnet systems for improved performance.