you should have specified what ga. you wanted from the get go,also,the installer should have asked if he was really interested in doing a good job,or maybe he isnt even aware of the differances..either way,the wire used probabbly had to be a u.l. listed in wall rated wire to pass inspection,and most contractors wouldnt stock anything larger,just the minnimum to get the job done...bottom line...you will still have sound...ron