[Elecraft] K2 Audio issue

[Bob Wehking]

I have a K2/100 & an Icom 756Pro. I am trying to use a switch box to switch a Icom SP-21 8 ohm speaker between rigs. When I have the K2/100 connected to the SP-21 I have to turn the audio control way up to hear anything, but when I switch back to the Icom radio its audio output is OK. Is this due to the fact that the K2/100 has a 4 ohm output & the Icom has an 8 ohm output?

Bob
WB8DDI
K2/100 # 4998