I second the response of Missioncoonery. I have used adapters to correct a similar situation and have not been able to detect any change in the quality of sound. It was the same as before using the adapters. You can always remove the adapters if you think there is a change in sound. Below is music direct web site showing adapters, I am using.
http://www.musicdirect.com/product/72732
http://www.musicdirect.com/product/72732