There are two set s of terminals on Forsmans speakers, also known as bi-wiring.
It is required that two sets of speaker cables are connected to the same point on the amplifier each again connected to the speperate terminals on the speakers.
This is done to reduce the distortion which is caused by the loss of voltage over the cables used. Bass and midtone/treble uses approximately equal amounts of power. When you play loud music this will lead to loss of voltage over the cable in accordance with the increase of the volume of the music.The loss of voltage causes adjustments of the volume between the elements so that the speaker will modulate inaccurately. The solution is to have seperate leads for bass and midtone/treble which will not be influenced by the loss of voltage on the other cable. It does not help to connect/bridge the terminals on the speaker itself.
The terminals are placed at the bottom of the speaker so that the cable connection is hidden and does not protrude as a sore thumb. This is an awardwinning loudspeaker we are talking about here.