Noise to go to sleep

When we brought Kayleigh home from the hospital we wanted to make sure that she would not be disturbed by the noises in the house when she was asleep. It started out with just the vacuum cleaner and then the sound system being on. We obviously went too far the other way. When Kayleigh was about 4 weeks old, we laid her on the couch and had the sound system on. Mind you we had two 15 inch subwoofers behind the couch at the time. We turned the music up and Kayleigh fell asleep. We thought it might be a good idea to turn it down but as soon as the volume decreased Kayleigh woke up. We turned up the music and she fell asleep again. As soon as we turned it down she woke up! We think it also had something to do with the bass vibrating the couch as well. As Kayleigh got older she preferred to clean with the music up and if we had music on when it was bed time it had to be loud enough for her to hear it.