Frzninvt is correct. For KG 4 and 4.2 the KG2.2V was the center channel
speaker. For the CF series the KV-4 was the center. The KV-1 , 2 and 3's
were for the KG4.5 and 5.5. The KG*V ended production in 94 were as the
KV were produced from 93-98. The CF speakers were only produced from
94-96. So it does depend upon the 4 speaker. Weather it's a 4.0, 4.2 or a 4.5.