Best Big Sub? or duals?

Shadorne, yes , it is. I use to have the 804s as well. I was a dealer for them in the distant past. Their factory was destroyed in the San Fran. earthquake and they never rebuilt. I don't think there is anything quite like them on the market now. Probably cost prohibitive as 8 12" Volts are a considerable expense. My REL Stadiums use one 10" Volt and do a great job, but of course will not play at anything like the same level.

REL is very good. I have just what you need for HT. A pair of Nelson Reed 1204s. They were designed by a California company for the movie industry to play back soundtracks at full volume in large spaces. They will reproduce 20 Hz at 120db levels. They use 4 12" Volt drivers on each channel, 2 forward facing and two facing back. The cabinets are large but not huge. I have the electronic crossover for them. When I used them on the cannons in the 1812 it would scare you. They were only used for a year or two before I moved into a smaller house and packed them up , where they have been the last 14 years. They were reviewed in Stereophile in the late 80s. I will sell them for$2900 with crossover, which is a fraction of the cost of building something like this now. The freight will be considerable , as they weigh 110lb each. I had intended to keep them but my present listening room will not hold them and I do not contemplate moving. There is info on them on line.