AFAIK there is no way to change the speaker size from the front panel. With the 950, if I remember correctly you could. Stereo Bypass and 7.1 analog is the only time I would want them Large the rest of the time I'd like them crossed over at 40hz.

My fronts can handle most music sources down low but unfortunately many DVD soundtracks have low bass mixed into the mains. I use stereo bypass for CDs because I have an external DAC. I run 7.1 analog for DVD-A and SACDs and prefer to have no A/D - D/A which is only possible by setting everything Large AFAIK. The only time I'd run the mains small is DVD for reasons mentioned above.