I have two Sony SS F6000 front speakers and an Onkyo sub-woofer with two Sony side speakers. My receiver is an Onkyo as well. All are older but work well. I recently decided to play around with the sounds again, and came back to a question I had when originally setting this up. On my receiver I have a choice of making the speakers "Large" or "Small". I notice that when set as Large the sub-woofer does not get any base passed to it unless I set the receiver to double base. Either way I listen to both settings and they don't sound all that much different. When I installed this I never had one of those mics people use for frequency tuning. I just set until my ears like what they heard. So my question is, how do people normally set this and what is recommended? Should I get a tuning mic? I wouldn't know if there were any sounds missing since I have never heard otherwise.