JUST INSTALLED NEW SURROUNDS AND LISTENED TO THEM YESTERDAY ALL DAY OUTSIDE. Close serial numbers too, only 1 number apart. Everything is working as it should and they sound so sweet. Some water marks on them and small scratches but will sand right out if you want. Bottom of 1 has some veneer peeling that I will reglue. Grills are not original but look great. The Acoustic Research AR-11 is a 3-way, 3-driver floor-standing speaker system known for its acoustic suspension design. Key specifications include a. It features a 12-inch woofer, a 1.5-inch hemispherical dome midrange, and a. 75-inch hemispherical dome tweeter. Here’s a more detailed breakdown. 3-way, 3-driver, acoustic suspension (sealed enclosure). 1.5-inch hemispherical dome midrange. 13.94″ x 25″ x 10.75 (354 x 635 x 273mm). 50 lbs (22.6kg). Typically features a walnut veneer finish. Removable foam grill for acoustic transparency.