R Series 8 inch dual cone assemblies 15WFor paging and distributed music, the R1810 Series of speaker grille assemblies features an 8 in. 15W dual cone driver with 10 oz. magnet, 70 25V dual voltage transformer, and screw mount grille with optional volume control or torsion grille. The R7810 Series a square grille with optional volume control. Model No. Driver Transformer Grille Volume Control R1810 72 810 TLM 572 WB 8 (screw) round R1810 72K 810 TLM 572 WB 8 (screw) round Rotary knob R1810