[GregS]

In article , (GregS) wrote:
In article , (GregS)
wrote:
In article , "Serge Auckland"
wrote:


"GregS" wrote in message
.. .
In article , "Mr.T"
MrT@home wrote:

"GregS" wrote in message
.. .
There should be 8 separate enclosures within the cabnet, and each of 4
drivers share a common port, so its not a total air leak.

Can you please explain how 4 drivers in isolated enclosures can share a
common port?
AFAIK none of the drivers are isolated.

I never visited the insides of the 802, but thats the way the 901 is.
There are
three chambers in the 901 III up. You see only two ports in the 802 right?


greg

The 901 has 9 drive units, 8 at the back and 1 at the front. In other words,
it is used the other way round to the 802 which has the 8 drive units facing
the audience and two ports at the back. The 901 is a sealed box, with no
ports, and is intended to provide most of its output reflected off the back
walls, and only a small amount directed at the listener. The 802 is a PA
'speaker, and in my view, quite a good one for speech and individual
instruments whilst the 901 was a so-called hi-fi 'speaker which singularly
failed, given that stereo doesn't work if the sound is scattered as the 901
did.

The 901 series I and II are sealed. Each used different drivers. The orginal
used a CTS
driver, which was also used in the pro audio "cubes" Series III moved to the
ported
enclosure. It has used the same low ohms aluminum coiled, higher QTS driver
ever since, as far as I know. The 901 series I and II were filled tightly with
fiberglass,
and the newer editions use nothing, as do most cheap computer speakers. Series
III
started to have wiring split so the sound could be channeled either more to
the
left
or more to the right. There was also a receiver that took comtrol.Later, the
option was
removed. To get decent bass from the 18 db amplified contour, a 300 watt amp
was
good to have, but the higher series models were slightly more efficient.

I think this was the orginal Bose speaker......
http://www.bose-pro.ru/901_007.jpg

I goofed. Here it is...
http://www.bose-export.com/philosophy/images/005.jpg


I found this interesting page but I can't read it. The orginal driver is shown
on the bottom, a bit
overdriven.

http://www.matthias-stark.de/html/restore.html

The 802 was only equalized down to about 50 Hz vs the 30 Hz of the 901.

greg