conical – low ross
3-1/8″ with 4 1-5/8″ outputs
EIA 4″1/2 – EIA 3″1/8
EIA 3″1/8 – EIA 4″1/2
EIA 3″1/8 – EIA 1″5/8
EIA 3″1/8 – EIA 7/8”
