Originally Posted by lord_bunny
I really agree with allen here and just wanted to add that closed-back is really the biggest factor in getting that extra bass, not really the number of speakers. I have used fender amps to power marshall 4x12's, traynor's to power 4x12's and lately an ac50 into a t60 cab (1x12 and a 1x15). They all had different characters, but the low end was always there because of the closed-back situation... not really how many speakers were in the cab. You can't get that sound from a 1x12 fender deluxe reverb.
However, fender deluxe reverbs and fender twins from the same era usually sound pretty identical to me. So again, it's the concept of the cabinet (in this case an open-back) and the amplifier used that determines the sound and not the number of speakers in play.
Well like I said it may be in my head but it seems I get more of what I want out of a 4x12, it probably has less to do with the number of speakers and more to do with the way the cab is built. I wonder why Michael Wagner has so many 4x12's if they don't sound any different from a single 12. Also I think the wattage of the head matters a little. If you're running a 120 watt Marshall into a single Vintage 30 I think you might run the risk of damaging the speaker.