[Peter Wieck]

You are entirely missing the point. There is no shame in this, perhaps I wa=
s not clear in the description, so I will try again.

a) Bass is omnidirectional below ~500 Hz. What this means is that even a "7=
..1" system does not need bass at all seven speakers.=20
b) A standard stereo system typically delivers full range signal to both th=
e left and right speakers.=20
c) A sub-woofer system will use either an electronic crossover-&-blend syst=
em - not cheap - or a dual-voice-coil driver. The dual-voice-coil driver is=
considerably less costly than an electronic option.=20
d) Some systems, even from far back in the day, had center-channel outputs =
from either amplifiers or receivers to accommodate early stereo recordings =
that greatly exaggerated separation, or for individuals who wanted a wide s=
ound-stage and needed center channel reinforcement.=20
e) Such a system will also deliver full-range signal to the center channel.=
=20
f) Many multi-channel (AKA Surround Sound) suffer from too wide a speaker s=
eparation, most especially as they tend to use tiny little speakers with ti=
ny little drivers.=20
g) With that in mind, a three-voice-coil driver is a standard, relatively l=
ow-cost, device to provide sufficient bass for a multi-speaker surround sou=
nd system.=20

To your point - the internal crossover does take all the '200 Hz' signal an=
d direct it to the sub-woofer. But there need not be any fancy blend circui=
try as would be required for a single-voice-coil driver.=20

Against your point - you do not need to deliver any bass to any of the peri=
pheral speakers, at all. A single point-source for bass is sufficient for t=
he need, and the entire purpose of any sub-woofer.=20

And, a general observation: surround sound systems are similar in applicati=
on to vehicular sound systems. When typically deployed for movies or listen=
ing when driving, fidelity is simply not possible nor the goal. The goal is=
to create an environment. Between action on the screen, road and wind nois=
e, whatever, again, there is no such thing as fidelity despite much blather=
to the contrary.=20

Peter Wieck
Melrose Park, PA