Kind of futile to get a true idea of how that sounds after being recorded on a consumer camera (possibly mono with one mic) and then encoded and compressed in normal youtube fashion). But, you can figure with four 18" woofers, four 6.5" mids and 4 horn tweeters, it's going to be fairly intense.
As I said with my quad SP-X9 experiment upthread, it was very loud; and while not awful, was not what I'd consider really good sound for home listening. To prove a point, and for entertainment value, it certainly delivers. Put on the DVD of The Who live at Leeds, and have a listen and you might get something approaching the sound of being there in person. But who really does that kind of listening on a regular basis in their living room?
If you have the room, the budget, and the amplifier power to indulge such frivolity, have at it. Can't deny I have some outrageous gear that far exceeds my needs, and I still occasionally add something that is entirely unnecessary to my collection. That said, I've cut back on that sort of stuff as beyond a certain point, it's just buying and displaying gear solely for the bragging rights. Yeah, I like bragging too, who doesn't?
About the only things left I really want in Sansui gear would be a BA-5000, maybe a B-2301 and a BA-202 and 303 tube amp setup (the latter being so rare I may never have the chance). I have well covered virtually all other Sansui components of note, except for the Eight receiver, the alpha series amps, and the SP-L800 speakers. I have an abundance of receivers and speakers as it stands now, so can't possibly justify any more on either cost or space to keep them.
My future will be full of recaps and restorations to keep what I have now usable, and really I need to divest myself of a lot of extra gear simply for pragmatic reasons. One of these days, there will be a motherlode of Sansui cut loose from the confines of my living room and basement and people are going to think I owned a distributorship when it happens.