My Onkyo TX SR-600 speaker config menu does not give me a choice to configure the front left and right speakers. It does give the option to configure center and surround speakers to 'small' or 'large'. Has anyone of you faced this problem?
Probably, the default setting is 'large'; and that'swhy they don't let you change it. I have Denon AVR-1803 Receiver. Eventhough, it lets me change the size of the speakers, it is reset back to 'large'. So, it may be already set for large speakers in your system and you can't have it changed.
I own an Onkyo TX-SR600 and have met with the same problem. Here's the solution. The amp is configured in such a way that if no sub is connected the front speakers will always be set as large in order for the amp to utilize full range sound. If you go to the menu and turn on the sub you will then be able to switch the front speakers to small.