Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How does the Acoustimass 3 Series compare to the Bose Companion II (computer speakers)?  Is it just that the Acoustimass has more bass?
Document: My Wife just purchased the Bose Acoustimass 3 Series IV for my birthday. I opened the box and hooked them up to an old (7 years) Sony reciever that had been sitting in the basement and threw in a old Santana CD. I can't believe my ears!! The clarity and range of sound is unbelievable for the size of the cubes! Yeah the Bass Module isn't going to shake the house down but it definitly adds to the listening experience.
This may not be a popular review, but my wife and I were sorely disappointed. They sound like a cheap boombox. We are very happy with Bose computer speakers and we decided to get Acoustimass speakers to replace our home theater. We returned it the same day we got them. The wiring is very simple, I will give you that. The sub woofer barely does anything, even when playing The Chemical Brothers! We compare them with the Bose computer speakers and Acoustimass were clearly inferior. By far.
The manual specifically states NOT to connect the speakers nor the bass module differently as it may damage the units.I am currently using the Bose Acousticmass 3 series IV as the rear channels in conjunction with a pair of Bose 201 for the Front channels for in the TV room--it sounds great! I have cranked up the sound for both movies and audio CDs and I am very pleased with both. Great price for the sound quality!
Stands and wall mounts for the cubes are available from Bose as well as numerous aftermarket manufacturers.From past reading I'd become aware of a double-chamber reflex speaker design that is said to provide bass enhancement over a wider range of frequencies than can be obtained with standard ported (bass-reflex) speakers. (1)  The look of the Acoustimass 3 module suggests a similar design pedigree, a factor that may explain its impressive performance-to-size ratio.
Have to agree with previous reviewers--bass is there but lacking. The separate woofer is not a subwoofer by any means. I'm using the Acoustimass 3 system as the "front speakers" in a low-budget surround sound system. Also have to agree with a previous reviewer that the individual cubes sound good. Just running the system without a center or rear channel speakers connected, "Fellowship of the Ring" sounded quite tolerable.
This allows for convenient bass adjustment by simply moving the Acoustimass module to that part of the listening area that offers the smoothest bass response. This means that compared to bookshelf and floor standing speakers, the Acoustimass 3 system gives users a better chance to obtain a satisfactory result without having to engage in objectionable furniture arrangements or acoustic modifications.If you regularly listen to broadcast sources, you may also find this speaker system to be a pleasant surprise.
Since bass is generally mixed equally in both stereo channels of a recording, utilizing a typical bookshelf or floor standing speaker system where both speakers reproduce bass frequencies would be problematic for me. Add in an amplified subwoofer and things could get more complicated because at that point I'd have up to 3 bass producing elements that could be causing problems. The Acoustimass 3 system has an advantage in this case because it appears that the cubes don't reproduce any bass frequencies and therefore don't factor in to bass tuning.
We just bought the Bose AM-3 Series speakers to replace 16 year old KEF speakers. We needed the space the old ones took up, and decided since we didn't listen to the stereo as much anymore, we could sacrifice some performance quality for size.What a wonderful surprise to find that after hooking them up we lost nothing in quality.
This is my second set of bose speakers. Yes, they are more expensive but when it comes to speakers you get what you pay for. I bought my first set of bose 601's in 1990 and they still sound like fresh out of the box. I use the 3 series as my rear surround sound speakers but they fill the room with perfect sound when playing music. Just a TOP notch set. Bose proves when it comes to speakers size does not matter.
I believe these factors rule out any possibility that the existence of vocal components in an Acoustimass 3 module causes either reliable module localization or compromised stereo separation.I noticed that when I placed my Acoustimass module on the left side of my entertainment center, I obtained a wide range of bass with no obvious booming in other portions of the listening area. On the other hand, when I placed the module on the right side of my entertainment center, there was a limit to the bass output at the main listening point.
Answer: The large speaker provides bass and the smaller speakers are more treble. I hooked them up to my home theatre. They made a huge difference.  I highly recommend them.  Best purchase I made in a long time.