85 T-Bar’s, Back Boxes, Transformers & L Pads T-Bar Bridge Styron Plastic These T-bar’s are designed for use in drop ceilings.  They keep the ceiling tile from sagging over time.  They hang from grid to grid   in the drop ceiling.  Available in plastic or metal for plenum applications. . MODEL # DESCRIPTION WTB-8 Styron Plastic T-Bar WTB-8M Metal T-Bar . . WTB-8 Back Boxes These enclosures protect speaker from accidental damage.  They also provide a baffle for greater sound reproduction.  Available in   plastic or metal for plenum applications. . MODEL # DESCRIPTION WBB-8 Plastic Back Box For 8 in. Ceiling WBB-8M Metal Back Box For 8 in. Ceiling Speaker . . WBB-8 WR-8 Mounting ring for plastic grilles and back boxes. . MODEL # DESCRIPTION WR-8 Mounting Ring For WG-8P Grille and WBB-8 Back Box . . WR-8 Line Matching Transformers These transformers are used in large PA systems.  They allow using a large number of speakers on one main line. . MODEL # DESCRIPTION W25-70 10W-25/70 Volt 10, 5, 2.5, 1.25 and .65 Watt Taps Combination W70-10   10W-70 Volt 10, 5, 2.5, 1.25 and .65 Watt Taps   . . W25-70 Volume Controls . Fader Control With Knob Volume control for  small  speakers of  4,  8 or  16 ohm impedance.    Control  dia.  3/8 threaded busing x 1 1/8" long. Shaft 1/2" x 1/4" dia.  Resistance range 5 ohms to 5K ohms. MODEL # DESCRIPTION 44-221 20 Ohm L Pad 44-221 100 Watt Volume Control Volume control for speakers of 4, 8 or 16 ohm impedance.  Control dia. 3/8 threaded busing x 1 1/8" long. Shaft 1/2" x 1/4" dia.  Resistance range 5 ohms to 5K ohms. MODEL # DESCRIPTION 44-223-100 100 Watt Volume Control 44-223-100