William Sommerwerck wrote:
Those speakers have a rear port. The placement
of the speaker can make a big difference.

Elaborate, please.

Well... for example...

If you place the speaker's back near to a wall, you modify the port's behavior.
If you push the speaker against the wall, you have effectively closed the port.

But, in general, placement near a boundary will change the low end on any
speakers. Move them toward the wall, you get more low end. Move them away,
you get less. Put them in a corner and almost anything gets boomy-sounding,
unless it's specifically designed to be there.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."