Quote Originally Posted by millerwill View Post
I have Sierra-1's L/C/R, on stands ~ 2 ft from a back wall (though the C sits on an equipment bench 2ft from the back wall), which are crossed with a sub (SVS PB10) at 70 to 80 Hz. I do have the plugs, but it's not clear to me if they really have much to offer since the sub takes the lower freqs. (Room is small/medium: 17' long, 14' wide, 8.3' high.)

Any suggestions for A, B, or none?
To really make the best use of the plugs, in-room measurements would be recommended so that we can actually "see" the various changes the different plugs make.

If measurements aren't available or if you don't want to get into that, Curtis offered the best recommendations

Have fun!