I can't find any information about Bose 911, only Bose system for Porsche 911. Do you mean Bose 901 speakers? I agree with others here wondering why you have been listening to speakers you do not like for 5 years. If your speaker is a Bose 901 it is very important to use the proper equalizer and that it is connected properly. It is also important to set up the speakers as the manufacturer suggests. The back or pointed side of the speaker should face the back wall. For best results the wall should be bare and the speakers placed 8"-18" from that wall. There should not be anything in front of the speaker to muffle the sound such as furniture.
Depending on the age of your speakers it might be worth while checking the foam surrounds on the drivers.
Matching associated equipment and cables is as important as it would be with any other speaker. However, audiophile approved equipment and cables are not necessary.
Keep in mind Bose speakers are designed by engineers from MIT, not some guy in his garage like many so called high end speakers. In fact MIT is currently the major share holder of Bose Corporation.
Ignore comments like "no highs no lows it must be Bose". The people making those comments have never owned Bose speakers and most likely have not even heard Bose speakers in several decades. Read the review in Tone Audio by Jeff Dorgay. He did not follow the owners manual for set up and he still got pretty good sound from the 901. If you follow the manual your sound should be better.
If you make an honest effort to get the best sound from your speakers without success your only option is to sell your Bose speakers and try something else. You will not have trouble selling them as Bose speakers are easy to sell. In that event you may want to try Dali speakers. They are not the best speaker, but you can buy them NEW for pennies on the dollar. Good Luck
