I can't see anything major that could have been done to S series to justify price based on improved performance.IO sold B&W for 6 years and left just before the S and D series came out.if you have the room just go out and get a pir of 803N's which have much bigger sound stage width,height and especially depth plus a coherence that the 804 just didn't have .I lsitened to these apeakers daily.used it will be $3500 for 803 but prices have dropped to $3K price.You'll need 200 watt the bter quality the better or if tube amn 100 wats like Arc VT100 Mk.II or Rogue 120's,Quicsilver VR4's etc (all good values).Hybrid amps,class D whatever because even though the nomminal load is not low and they are rated 90 db efficient they have a nasty impedance drop so crave curent.Good 200 watt need now cost and arm and a leg these days.I used a 300 wat Adcom GFA 5802 (modded caps realy improved it) and it was great.Played them with Krell in showroom and the bas traction was superb but mids were ebter with other amps.If you have small set up )100 solid state or less than 80 wats tube)I'd go here the Von Schweikerts.Their a fine speaker and maybe the nter of the two.It's close.I am BTW also a fan of Audio Physic (used) and Spendors (8's or 9's).If you want to spend less and know of a Quad dealer you''ll really be inmpressed with Quad 22L.Hell of speaker for the money with that Brit sound and not the high prioce of Harbeth,ATC etc.Used 803's if you have room and amp will be way beter than new 804S's.
G'luck
Chazzbo
G'luck
Chazzbo