"Arny Krueger" wrote in message
...
"Peter Sammon" wrote in message


"Robert Morein" wrote in
:


The multi
chambered ACOUSTIC MATRIX enclosure vents the speaker in a most
unusual way with air
speeds exceeding 60 mph! Three ports or jets protrude through the
rear of the 901 enclosure.

Knowledgeable speaker designers know that high air velocity in ports is
anathema. High air velocities lead to higher turbulence, and turbulent
flow
tends to be noisy flow. One sign of a quality ported speaker is a large,
low-velocity port.

True. Ports are an unavoidable source of nonlinearity, but it can be
minimized by choice of the largest possible port diameter.