Heritage Audio 73EQ JR 73JR II Baby RAM BritStrip BT-500 v2.0 Grandchild 670 HA-609A HA73 Elite HA73EQ Elite HA73EQX2 Elite HA73X2 Elite LANG PEQ-2 OST-4 v2.0 OST-6 v2.0 RAM System 1000 RAM System 2000 Successor